SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13G


                   Under the Securities Exchange Act of 1934
                               (Amendment No. _)*


                                 SPX Corporation
             -----------------------------------------------------
                                (Name of Issuer)

                                  common stock
             -----------------------------------------------------
                         (Title of Class of Securities)

                                   784635-10-4
             -----------------------------------------------------
                                 (CUSIP Number)



Check the following box if a fee is being paid with this statement [ ].


- ----------
*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                                Page 1 of 11 Pages



CUSIP No. 784635-10-4               SCHEDULE 13G            Page 2 of 11 Pages



- --------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON(S)
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)

          Iridian Asset Management LLC
          06-1439577


- --------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3.  SEC USE ONLY




- --------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER
     SHARES             Not applicable
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER
      EACH               Not applicable
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER
      WITH               Not applicable
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER
                         Not applicable
- --------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      Not applicable

- --------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 5%

- --------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON*


     IA

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 784635-10-4                 SCHEDULE 13G           Page 3 of 11 Pages



- --------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON(S)
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)

          LC Capital Management LLC
          06-1439578


- --------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3.  SEC USE ONLY




- --------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER
     SHARES              Not applicable
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER
      EACH               Not applicable
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER
      WITH               Not applicable
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER
                         Not applicable
- --------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      Not applicable

- --------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 5%

- --------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON*


     HC

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 784635-10-4             SCHEDULE 13G               Page 4 of 11 Pages



- --------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON(S)
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)

          CL Investors, Inc.
          52-2070252


- --------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3.  SEC USE ONLY




- --------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER
     SHARES              Not applicable
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER
      EACH               Not applicable
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER
      WITH               Not applicable
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER
                         Not applicable
- --------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      Not applicable

- --------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 5%

- --------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON*


     HC

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 784635-10-4               SCHEDULE 13G             Page 5 of 11 Pages



- --------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON(S)
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)

          David L. Cohen
          ###-##-####


- --------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3.  SEC USE ONLY




- --------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION

          USA


- --------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER
     SHARES              Not applicable
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER
      EACH               Not applicable
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER
      WITH               Not applicable
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER
                         Not applicable
- --------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      Not applicable

- --------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 5%

- --------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON*


     IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



CUSIP No. 784635-10-4                 13G                    Page 6 of 11 Pages



- --------------------------------------------------------------------------------
   1.  NAME OF REPORTING PERSON(S)
       S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON(S)

          Harold J. Levy
          ###-##-####


- --------------------------------------------------------------------------------
   2.  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                             (a)  [  ]
                                                             (b)  [  ]


- --------------------------------------------------------------------------------
   3.  SEC USE ONLY




- --------------------------------------------------------------------------------
   4.  CITIZENSHIP OR PLACE OF ORGANIZATION

          Delaware


- --------------------------------------------------------------------------------
   NUMBER OF      5.   SOLE VOTING POWER
     SHARES               Not applicable
  BENEFICIALLY    --------------------------------------------------------------
    OWNED BY      6.   SHARED VOTING POWER
      EACH                Not applicable
   REPORTING      --------------------------------------------------------------
     PERSON       7.   SOLE DISPOSITIVE POWER
      WITH                Not applicable
                  --------------------------------------------------------------
                  8.   SHARED DISPOSITIVE POWER
                          Not applicable
- --------------------------------------------------------------------------------
   9.  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     Not applicable

- --------------------------------------------------------------------------------
  10.  CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*



- --------------------------------------------------------------------------------
  11.  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

     Less than 5%

- --------------------------------------------------------------------------------
  12.  TYPE OF REPORTING PERSON*


     IN

- --------------------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               SCHEDULE 13G                 Page 7 of 11 Pages



Item 1.     (a)   Name of Issuer:
                    SPX Corporation
                  --------------------------------------------------------------
            (b)   Address of Issuer's Principal Executive Offices:
                    PO Box 3301
                    700 Terrace Point Drive
                    Muskegon, Michigan 49443-3301
                  --------------------------------------------------------------
Item 2.

     This statement is being filed on behalf of Iridian Asset Management LLC, LC
Capital Management,  LLC, CL Investors, Inc., David L. Cohen and Harold J. Levy.
A previous  filing was made on Schedule 13G for the calendar  year 1997 relating
to the common stock of General Signal Corporation,  CUSIP number 370838104,  CIK
0000040834, which was merged into SPX Corporation in 1998.

(a)  Name of Person Filing:                     Iridian Asset Management LLC
(b)  Address of Principal Business Office:      276 Post Road West
                                                Westport, CT 06880-4704
(c)  Citizenship:                               Delaware
(d)  Title of Class of Securities:              Common Stock
(e)  CUSIP Number:                              784635-10-4


(a)  Name of Person Filing:                     LC Capital Management, LLC
(b)  Address of Principal Business Office:      c/o Iridian Asset Management LLC
                                                276 Post Road West
                                                Westport, CT 06880-4704
(c)  Citizenship:                               Delaware
(d)  Title of Class of Securities:              Common Stock
(e)  CUSIP Number:                              784635-10-4


(a)  Name of Person Filing:                     CL Investors, Inc.
(b)  Address of Principal Business Office:      c/o Iridian Asset Management LLC
                                                276 Post Road West
                                                Westport, CT 06680-4704
(c)  Citizenship:                               Delaware
(d)  Title of Class of Securities:              Common Stock
(e)  CUSIP Number:                              784635-10-4


(a)  Name of Person Filing:                     David L. Cohen
(b)  Address of Principal Business Office:      c/o Iridian Asset Management LLC
                                                276 Post Road West
                                                Westport, CT 06880-4704
(c)  Citizenship:                               USA
(d)  Title of Class of Securities:              Common Stock
(e)  CUSIP Number:                              784635-10-4


(a)  Name of Person Filing:                     Harold J. Levy
(b)  Address of Principal Business Office:      c/o Iridian Asset Management LLC
                                                276 Post Road West
                                                Westport, CT 06880-4704
(c)  Citizenship:                               USA
(d)  Title of Class of Securities:              Common Stock
(e)  CUSIP Number:                              784635-10-4



                                SCHEDULE 13G                Page 8 of 14 Pages



Item 3.     If this  statement  is  filed  pursuant  to  Rules  13d-1(b),  or
            13d-2(b), check whether the person filing is a:

(a)  [ ] Broker or Dealer registered under Section 15 of the Act,

(b)  [ ] Bank as defined in Section 3(a)(6) of the Act,

(c)  [ ] Insurance Company as defined in Section 3(a)(19) of the Act,

(d)  [ ] Investment Company registered under Section 8 of the Investment Company
     Act,

(e)  [X]  Investment  Adviser  registered  under  Section 203 of the  Investment
     Advisers Act of 1940,

(f)  [ ] Employee Benefit Plan,  Pension Fund which is subject to the provisions
     of the Employee  Retirement  Income Security Act of 1974 or Endowment Fund;
     see Section 240.13d-1(b)(ii)(F); see Item 7,

(g)  [   ]   Parent    Holding    Company,    in    accordance    with   Section
     240.13d-1(b)(1)(ii)(G); see Item 7,

(h)  [ ] Group, in accordance with Section 240.13d-1(b)(1)(ii)(H).




                                 SCHEDULE 13-G               Page 9 of 14 Pages


Item 4.     Ownership.

     Not applicable


Item 5.     Ownership of Five Percent or Less of a Class.

If this  statement  is being filed to report the fact that as of the date hereof
the  reporting  person has ceased to be the  beneficial  owner of more than five
percent of the class of securities, check the following: X


Item 6.     Ownership of More Than Five Percent on Behalf of Another Person.

Not Applicable.


Item 7.     Identification and Classification of the Subsidiary which Acquired
            the Security Being Reported on By the Parent Holding Company.

Not Applicable.


Item 8.     Identification and Classification of Members of the Group.

     This  filing is being made  jointly by Iridian  Asset  Management  LLC,  LC
Capital Management, LLC, CL Investors, Inc., David L. Cohen and Harold J. Levy.


Item 9.     Notice of Dissolution of Group.

Not Applicable.


Item 10.    Certification.

     By signing below the undersigned certifies that, to the best of its or his
knowledge  and belief,  the  securities  referred to above were  acquired in the
ordinary  course of business and were not acquired for the purpose of and do not
have the effect of  changing  or  influencing  the control of the issuer of such
securities  and were not acquired in connection  with or as a participant in any
transaction having such purpose or effect.




                                 SCHEDULE 13-G              Page 10 of 11 Pages


                                   SIGNATURE.


     After  reasonable  inquiry  and to the  best  of its or his  knowledge  and
belief,  we certify that the  information  set forth in this statement is true,
complete and correct.


Date: February 8, 1999

                                   IRIDIAN ASSET MANAGEMENT LLC

                         By:           /s/ Jeffrey M. Elliott
                                   ----------------------------------
                                   Jeffrey M. Elliott, Executive Vice President


                                   LC CAPITAL MANAGEMENT, LLC

                         By:           /s/ Jeffrey M. Elliott
                                   ----------------------------------
                                   Jeffrey M. Elliott, Executive Vice President


                                   CL INVESTORS, INC.

                         By:           /s/ Jeffrey M. Elliott
                                   ----------------------------------
                                   Jeffrey M. Elliott, President


                         By:           /s/ David L. Cohen
                                   ----------------------------------
                                   David L. Cohen, individually


                         By:           /s/ Harold J. Levy
                                   ----------------------------------
                                   Harold J. Levy, individually

         
                                                            Page 11 of 11 Pages

                                    EXHIBIT A

     JOINT FILING AGREEMENT AMONG IRIDIAN ASSET MANAGEMENT LLC, LC CAPITAL
     MANAGEMENT, LLC, CL INVESTORS, INC., DAVID L. COHEN AND HAROLD J. LEVY


     AGREEMENT  between  Iridian Asset  Management LLC  ("Iridian"),  LC Capital
Management, LLC ("LC"), CL Investors, Inc. ("CLI"), David L. Cohen ("Cohen") and
Harold J. Levy ("Levy").

     WHEREAS, in accordance with Rule 13d-1(f) under the Securities Exchange Act
of 1934 (the "Act"), only one statement  containing the information  required by
Schedule  13G and any  amendments  thereto  need be filed  whenever  two or more
persons are  required to file such a statement  or any  amendments  thereto with
respect to the same securities, provided that said persons agree in writing that
such statement or any amendment thereto is filed on behalf of them.

     NOW,  THEREFORE,  in  consideration  of the premises and mutual  agreements
contained herein, the parties hereto agree as follows:

     Iridian,  LC, CLI, Cohen and Levy, do hereby agree, in accordance with Rule
13d-1(f)  under the Act, to file a Schedule 13G  relating to their  ownership of
the  common  stock of SPX  Corporation,  and do hereby  further  agree that said
Schedule 13G shall be filed on behalf of each of them.


Date: February 8, 1999

                                   IRIDIAN ASSET MANAGEMENT LLC

                         By:           /s/ Jeffrey M. Elliott
                                   ----------------------------------
                                   Jeffrey M. Elliott, Executive Vice President


                                   LC CAPITAL MANAGEMENT, LLC

                         By:           /s/ Jeffrey M. Elliott
                                   ----------------------------------
                                   Jeffrey M. Elliott, Executive Vice President


                                   CL INVESTORS, INC.

                         By:           /s/ Jeffrey M. Elliott
                                   ----------------------------------
                                   Jeffrey M. Elliott, President


                         By:           /s/ David L. Cohen
                                   ----------------------------------
                                   David L. Cohen, individually


                         By:           /s/ Harold J. Levy
                                   ----------------------------------
                                   Harold J. Levy, individually