NP205 swap : TH400 output shaft

[wickedwagon767]

I've heard that there are (2) different 32spline transmission rear output shafts used in GMTH400-NP205 combos. A "short" version and a "long" version.

Of the figure 8 "racetrack" pattern NP205's and the round 6-bolt style GM 205's which one uses the shorter shaft and which one uses the longer?

FYI : I'm hunting down parts to swap in the round 6bolt style 205

[Dmntxn77]

You will most likely need the longer one for the round pattern 205..

The difference between the 2 shafts is 1 inch...

[wickedwagon767]

I assumed the longer one was for the figure 8 205 because the adapter looks thicker for that combo when compared to the smallish round pattern adapter.

[Dr.E]

I believe the short TH400 output shaft stick out is 2.5" and mates
to the long 32 splined NP205 input shaft stick out of 3.5".
The long NP205 input came in 85-91 1-ton GM trucks with the round patern
TH400 and the SM465 trannies.
It is important to make clear if you are refering to the TH400 output
or the NP205 input when using the "Long" or "short" reference so not to confuse the two.

[wickedwagon767]

I believe the short TH400 output shaft stick out is 2.5" and mates
to the long 32 splined NP205 input shaft stick out of 3.5".
The long NP205 input came in 85-91 1-ton GM trucks with the round patern
TH400 and the SM465 trannies.
It is important to make clear if you are refering to the TH400 output
or the NP205 input when using the "Long" or "short" reference so not to confuse the two.
I referred to the TH400 "output shaft" in my original post. That is what I am searching for at the moment.

I get different answers on output shafts offered by GM with the TH400. Some guys are telling me that the only "short" 32-spline transmission output shaft GM made for the TH400 transmission was for the NP203 full-time case. Some guys are telling me the same "long" 32-spline 4wd TH400 output shaft can be used with the 32-spline input figure 8 NP205 AS WELL AS the round 6-bolt NP205 with the 32-spline input

:banghead:

[Casey]

To bolt to a round pattern 205 adapter you'll need the long output. It sticks out of the 400 about 4.5".

[wickedwagon767]

Hope so

I just bought the "long" one