2004r to th400 what all is needed

[NorthWestRider]

just wondering what i will have to do to swap in a th400 into my 87 ss monte i know the mounting pad is suppose to be the same as 2004r so crossmember should stay same. But what all do i need as far as driveline. It looks like i hav the shorttail th400

 

[Garrett1982]

You will need a kickdown switch, a different converter if you don't already have one, and a a different driveshaft. The 400 with the short tailshaft is longer than the 200 4r even though the mounts are in the same location and it will need a larger slip yoke.

 

[NorthWestRider]

You will need a kickdown switch, a different converter if you don't already have one, and a a different driveshaft. The 400 with the short tailshaft is longer than the 200 4r even though the mounts are in the same location and it will need a larger slip yoke.

Converter i have now as far a driveshaft is the length the same or will this one need to be shortened or do i just need to do the 400 yoke

 

[Garrett1982]

Converter i have now as far a driveshaft is the length the same or will this one need to be shortened or do i just need to do the 400 yoke

You with need both, shortened and 400 yoke.

 

[565bbchevy]

If you are changing to a 400 turbo trans over the 200R4 for the added strength then I would continue the process by ordering a stronger custom made driveshaft instead of spending money cutting, rewelding and balancing your old smaller diameter driveshaft.

 

[NorthWestRider]

You with need both, shortened and 400 yoke.

Any idea how much it needs to be shortened?

 

[NorthWestRider]

If you are changing to a 400 turbo trans over the 200R4 for the added strength then I would continue the process by ordering a stronger custom made driveshaft instead of spending money cutting, rewelding and balancing your old smaller diameter driveshaft.

I agree with you but right now i just wanna get it mobile for now

 

[NorthWestRider]

So today i went to wrecking yard and i found a th400 with the yoke so i pulled it. Both trans looked the same so i figured it would work so the one i pulled the yoke off of had a bolt threw the center and when i got home i looked at mine and it dont have that bolt hole can i still use this yoke or did i grab the wrong one?

 

[Garrett1982]

Looks like it would be 3/4" shorter with the 4" tailshaft.

 

[NorthWestRider]

Does this look ok or do i need to find a different yoke? My trans dont have the threads in the output shat like the one i pulled the yoke off of