TH400/205

[Taylormade]

Calling the Th400/NP205 experts. I’m fairly confident that this will work, but I wanted to get a second opinion on it before I go full send. For the question…will these work together?

Th400 that originally had an NP203 with the short 32 spline output shaft, and a ‘91 NP205 with the long 32 spline input shaft.

 

[nvrenuf]

What adapter?

I have always understood the tailshaft for a 203 application to be unique and not fit anything else.

 

[nvrenuf]

Since the 400 tailshaft only sticks out an inch, the adapter you use would need to be slightly shorter than the amount the 205 input sticks out.

 

[Chickntrk]

Won’t work, a 400 that had a 203 has an output shaft unique to that application. To use the long 32 spline input you need a 400 tail shaft with 2.5” stickout length…the 400/203 only sticks out a little over an inch.

Here’s a handy guide from ORD:

TH400

www.offroaddesign.com

 

[Taylormade]

Yup, y’all are correct, won’t work. Now for plan b…

I’m picking up a blazer today with no engine/trans/tcase, so I’m looking at all the spare parts in my garage and thinking what can I slap together to make this thing a runner

I may end up going the 5.3/4l60e route. Those are easy enough to find.

 

[Chickntrk]

Doubler? You already have the 400 and a 205….not exactly a throw together thing tho

 

[Taylormade]

Doubler? You already have the 400 and a 205….not exactly a throw together thing tho

I thought about that too. I have all the 203 parts I need, I would just need the doubler.

 

[obijuank5]

You can use the 203 output th400 with the 1” thick th400 atlas adapter and the short input on a round 205.

 

[Chickntrk]

You can use the 203 output th400 with the 1” thick th400 atlas adapter and the short input on a round 205.

That would have been handy to know about two years ago I assume you can use it with a 208/241 as well?

 

[obijuank5]

Yes