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What transfer case do I have?

Discussion in 'The Garage' started by Eric M., Apr 18, 2005.

  1. Eric M.

    Eric M. 1/2 ton status

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    It's a 74 GM 3/4 ton. The shifter has 4 hi, 4 lo, Neutral, 4 hi loc, 4 lo loc.

    Is this a 203 or a 208? What is the diffeence between the two?

    Thanks,

    Eric M.
     
  2. JK5

    JK5 1/2 ton status GMOTM Winner

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    It sounds like a 203....
    Does it have a fixed yoke rear out-put???

    The 208 is ALL aluminum...
    the 203 is cast iron...except for the rear output..it is aluminum.
     
  3. R72K5

    R72K5 Banned

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    203

    208 wasnt until 80

    80 is aluminum and part time

    203 is a whole different thing
    203 is full time and iron case
    you have no 2wd position, you are always in 4x4 in the 74

    although both happen to be chain driven
     
  4. nvrenuf

    nvrenuf NONE shall pass! Premium Member

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    208 started in '81, the only t-case used by GM in '80 was a 205 (regardless of truck configuration).
     
  5. kennyw

    kennyw N9PHW Premium Member

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    You will have a NP203 with that shift pattern. The NP208 was not offered until 1981 (1980 the only Tcase available was a slip yoke NP205 no matter what tranny you had).

    The NP203 is a cast iron case, chain driven, 1.96:1 low range available behind auto trannies from 73-79 and SM465's in 1974 only.

    NP205 cast iron case, gear driven, 1.96:1 low range Available behind auto's and manual tranny's 1970?-1990 (1981-1990 only in 1 tons)

    NP208 aluminum case, chain driven, 2.6 or 2.7?:1 low range available from 1981-1990 in 1/2 and 3/4 tons.

    I may be slightly off on the ending years available though.
     
  6. Eric M.

    Eric M. 1/2 ton status

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    Thanks. 203 it is.

    So, a 208 is a part time unit?


    Eric M.
     
  7. kennyw

    kennyw N9PHW Premium Member

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    Yes
     
  8. sweetk30

    sweetk30 professional hooker Premium Member

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    205 is part time and gear to gear. best in my book other than 2.0 low range.
     
  9. browningejm

    browningejm Registered Member

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    I just looked at mine (75k5 np203) it shifts.. low lock,low,neutal high,high lock
     

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