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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: xschroederx on September 09, 2014, 06:36:34 pm

Title: turbo 400 trans from 2x4 to 4x4 swap?
Post by: xschroederx on September 09, 2014, 06:36:34 pm

So I am parting out my 78 gmc and I want to give my transmission to him as he needs that same transmission. Problem is, the transmission is coming out of a 2 wheel drive, and he needs one for his 4x4. Is it possible to swap the trans?

Title: Re: turbo 400 trans from 2x4 to 4x4 swap?
Post by: Engineer on September 09, 2014, 08:06:11 pm

Yes, you will need to remove the tail housing, change the output shaft, and drive a freeze plug into the hole where you take out the speedo drive from.

I assume "his" is a TH400 as well? If not that complicates things a bunch.

Title: Re: turbo 400 trans from 2x4 to 4x4 swap?
Post by: Irish_Alley on September 09, 2014, 11:31:21 pm

output shaft doesnt just come out. you have to take the inside of the trans apart to remove the outputshaft
(http://www.oldjeep.com/images/th400shafts%20002.jpg)
it is posable to have the same shaft but you have to look at it i dont know what came in what

Title: Re: turbo 400 trans from 2x4 to 4x4 swap?
Post by: Blazin on September 10, 2014, 06:35:42 pm

If your gona tear apart the whole trans to swap the output shaft, you might as well rebuild the trans that has an issue.