Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

help i.d.ing a 4 speed..

Discussion in 'The Lounge' started by ryoken, Oct 25, 2004.

  1. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    my good friend and coworker runs around in a 63 Chevy ambulance.. it was a 283, 4 spd, now a 327 4 spd.. not certain it came with the 283..

    anyway, we're trying to I.D the 4 spd gear box. apparently they where used in early 60's school buses, etc... i'm guessing mainly 2 WD vehicles...

    the numbers he pulled off it are GM 591958.... anybody have a clue as to what box this might be? even whether its a Borg-Warner, Saginaw, Muncie, etc.... /forums/images/graemlins/confused.gif he says apparently they where made from the 50's thru early 70's from what he's gathered...

    any help is appreciated /forums/images/graemlins/thumb.gif
     
  2. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    sm420 /forums/images/graemlins/dunno.gif

    IIRC the sm420 has only 1 pto cover
     
  3. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    hmmm, i bet thats it... i haven't seen it.. he's been bitching about finding parts for it. i'll print a pic i just found on a website of the 420 and show it to him tomorrow.

    are parts readily available for those? synchro's, shift forks, etc?

    thanks for the help /forums/images/graemlins/waytogo.gif
     
  4. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
  5. 75-K5

    75-K5 3/4 ton status

    Joined:
    Apr 28, 2002
    Posts:
    5,353
    Likes Received:
    0
    Location:
    Anderson, Indiana
    Maybe a Clark? I know they made 5 speeds for GM buses, maybe they had a 4 spd. version too.
     
  6. big83chevy4x4

    big83chevy4x4 3/4 ton status

    Joined:
    Mar 22, 2002
    Posts:
    6,587
    Likes Received:
    0
    Location:
    Sheridan, Michigan
    i can get a rebuilt kit for the sm420 for $207 with out syncros /forums/images/graemlins/crazy.gif

    acourding to my books (too old for an application look up) they also made a sm435 starting 63-72. the sm420 was from 48-67, so /forums/images/graemlins/dunno.gif
     
  7. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

    Joined:
    Jun 13, 2003
    Posts:
    29,624
    Likes Received:
    1,380
    Location:
    Jersey Shore
    found some good info over here http://www.6066gmctrucks.org/3-to-4-speed.htm little about the 435 too...

    probs gonna be he needs more than a major kit and synchro's.. he also needs a shift fork... if it is the 420, i'll have him call that Havoc place i found a link for. they say to call for other parts..

    thanks again...
     
  8. kennyw

    kennyw N9PHW Premium Member

    Joined:
    Jun 9, 2002
    Posts:
    13,224
    Likes Received:
    94
    Location:
    Stevens Pass Highway, WA
    Should be the SM420 (Muncie). Look over at the 6066 GMC website for pics of the SM420 /forums/images/graemlins/thumb.gif
     
  9. kennyw

    kennyw N9PHW Premium Member

    Joined:
    Jun 9, 2002
    Posts:
    13,224
    Likes Received:
    94
    Location:
    Stevens Pass Highway, WA
    /forums/images/graemlins/doah.gif Looks like you already found the GMC site... for the best price and service on the rebuild kit, contact Transmission Exchange Company in Portland, OR. /forums/images/graemlins/thumb.gif last I checked with them the SM420 rebuild kit with syncro's was around $125-130 or something like that.
     

Share This Page