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ID-ing transmission and transfer case?

Discussion in 'The Garage' started by bettabruce, Feb 9, 2005.

  1. bettabruce

    bettabruce Registered Member

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    Location:
    Jackson, MS
    I own a 75 K5 and I was wondering how to identify

    the transmission and transfer case. Also, I don't know how

    to tell if my truck has full or part time 4wd. At the moment,

    my truck is crippled with 2wd. Thanks in advance.
     
  2. eclipse

    eclipse 1/2 ton status

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    Are you Auto or manual? If your manual its a SM465... a muncie tranmission.
    Your transefer should either be a np205 part-time, or a np203 which is full time.

    Auto... should either be a TH400 or TH350 3spds. Quickest is the pan on the bottom, TH400 has a bigger more square shaped pan.
     
  3. check to see if there is a PTO cover IF there is, ita 205 part time
     
  4. divorced

    divorced 3/4 ton status

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    I thought the TH350 was more square shaped? It is square except for the corner chopped off.
     
  5. big83chevy4x4

    big83chevy4x4 3/4 ton status

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    the th350 tranny has a square pan with a corner cut off, the th400 has a illinois shapped pan and a 700r4 (not avaliable untill 82) has a square pan.

    a np203 and np205 both have pto covers. the np203 is long and has a 1" thick adapter. the np205 has atleast a 3" thick adapter (depending on auto or stick) and has a small cover with 3 bolts holding it on in the middle on rear of the tcase.
     
  6. eclipse

    eclipse 1/2 ton status

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    doh... your right I got that backwords, the TH350 is the squarepan with the notched corner :blush:
     
  7. mechted

    mechted 1 ton status Premium Member

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    Location:
    Granbury, TX
    if the tranny is stock
    Manual - Sm465 (Shift Pattern is L 1 2 3 R)
    Auto - TH350 (3 speed, square pan with 1 corner 45'ed)

    tcase is easiest to ID by shift pattern:
    Np203: (Full time - many have been converted to part time)
    Low Lock
    Low
    N
    High
    High Lock

    Np205: (Part time)
    4Lo
    4High
    N
    2High

    if its not stock, then it gets more complicated]

    As for fulltime/parttime, Do you have locking hubs on the front axle?
    Yes - Part time (could be np205 or converted np203)
    No - Full time (np203)
     

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