GM TH400 to Jeep NP208?

Brent460

Well-known member
Joined
Sep 17, 2013
Rookie question. Output on the trans is 32 input on the 208 is 23? Is it just swapping out the the input shaft on the 208 to a 32 spline and making sure I have the correct factory adapter/outputshaft length?
 
Yes on the spline counts. There should be a Jeep400/np208 adapter out there that works. With the GM adapter, the bolt pattern is the same on the mounting, but the rotation is wrong. it will line up with 5 of the 6 bolts, but will site just slightly above flat. If I remember right, the missing bolt is low, so it becomes a leak issue as well. Jeep 208 may have the alignment dowel also that you need to pop out. I cant remember is that dowel is a Dodge thing, or Jeep thing, or both back then.
 
Big4x4ride said:
Yes on the spline counts. There should be a Jeep400/np208 adapter out there that works. With the GM adapter, the bolt pattern is the same on the mounting, but the rotation is wrong. it will line up with 5 of the 6 bolts, but will site just slightly above flat. If I remember right, the missing bolt is low, so it becomes a leak issue as well. Jeep 208 may have the alignment dowel also that you need to pop out. I cant remember is that dowel is a Dodge thing, or Jeep thing, or both back then.
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Thank you. I thought so but needed a little reasurance. Its been quite a while since Ive read up on the interchangeability. I found a NP208 somewhat local for dirt cheap. The plan is to go pick it up tomorrow. I think with the th400 and NP208 I should still be able to use the factory column shifter and crossmember.
 
On the t400 to 208 adaptor. Dott just made one for Ryan..
 

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Finally finished the test fitting and machining.

Here's a link to the ad on my website.

www.tdsideas.com

TH400-NP208 Transfer Case Adapter - Short Foot

**** 3ea in stock as of 06-15-23 **********Have you broken the transfer case adapter on a TH400-NP208 combo?The factory cast steel parts are no longer available.There are some cast aluminum parts available but they are weak.Don't take chances on used adapters from ebay.About the item:This...
www.tdsideas.com
 
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