Swapping a TH350 for a TH400

[Elco Slimm]

Im swapping my TH350 for a TH400 on my 79 El Camino. Does anyone know what kind of car I can get a crossmember that fits? The crossmember for my TH350 doesnt line up right. Also the TH400 doesnt have a spot for a kickdown cable but i do see a spot for a electric plug. Does anybody know what its for? Thanks in advance.....

 

[monte olrac]

Ok there isn't any G-body car that came with a Th400, I think IIRC that you can make a TH200r4 crossmember work with some adjustments, know as far as the kick down you will need to use a switch since the kickdown was electrical on the 400, hopefully someone else will chime in with more info

 

[Likethat]

The 400 has a different yoke then the 350, so you drive shaft needs to have the right yoke and length. 200r4 cross.

 

[Elco Slimm]

So would it be best to go with a 200r4 or 700r4 instead of the TH400?

 

[CHRIS.O]

Whats wrong with the th350 that is in it?

 

[Elco Slimm]

Nothings wrong with it, trying to get the best performance.

 

[custom442]

So would it be best to go with a 200r4 or 700r4 instead of the TH400?

he was saying you need a different yoke and the 200r4 crossmember will allow the turbo 400 to bolt in place.
the turbo 400 will make your car slower, I wouldnt swap from a th350 unless you have serious power. th350's can be built to handle about a 10 second g body car so... I'd say just get a rebuild/shift kit/torque converter

 

[Elco Slimm]

So would it be best to go with a 200r4 or 700r4 instead of the TH400?

he was saying you need a different yoke and the 200r4 crossmember will allow the turbo 400 to bolt in place.
the turbo 400 will make your car slower, I wouldnt swap from a th350 unless you have serious power. th350's can be built to handle about a 10 second g body car so... I'd say just get a rebuild/shift kit/torque converter

My 350 snaps my head back without a shift kit. Thanks for the advice i guess im sticking with the 350!!!

 

[custom442]

My 350 snaps my head back without a shift kit. Thanks for the advice i guess im sticking with the 350!!!

Good choice, I have a full manual valve body and am about to swap my converter for a 1200 stall :shock: don't do that. I'm making her into a highway cruiser but the shifts are firm, decently quick for an auto, and it hauls, th350 is a great transmission.

 

[CHRIS.O]

Nothings wrong with it, trying to get the best performance.

Then stick with it. TH350 is one of if not the best performance automatic transmissions out there.