What transfer case do I have?

[Eric M.]

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.

 

[JK5]

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.

 

[R72K5]

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

 

[nvrenuf]

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

 

[kennyw]

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.

 

[Eric M.]

Thanks. 203 it is.

So, a 208 is a part time unit?


Eric M.

 

[kennyw]

So, a 208 is a part time unit?

Yes

 

[sweetk30]

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

 

[browningejm]

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