hey tried the search function(3 times) to no avail so im asking here i will be in the next week or so be installing a th350 into my 91 rs my question is which trans mount will i need the 700r4 or th350 i get conflicting answers from trans guys i know around here any help is appreciated thanx

 

The transmission mount isn't specific to the tranny however the tranny crossmember will need to be modified. The TH350 mount sits about 2" farther ahead than a 700R4. Since there were never any factory TH350's put into third gens, you'll have to modify the crossmember or buy an aftermarket one.

If you're still using a factory torque arm, nows a good time to upgrade. You can buy a Spohn torque arm with a tranny crossmember designed for a TH350. The crossmember/torque arm package also moves the torque arm mount to the crossmember since there's no place to mount it on a TH350.

 

or find a TH200C crossmember

if possible

glad my 82 was TH200C

or you could just make a mount extender out of a plate of steel

simple


all you need is four holes in it and youre good to go

this is what i would do if i were to put a th50 in place of a 700r4

simple easy and quick and cheap and it will work just fine no problem


all you need is a torch or saw, and a drill

and a piece of steel

search feature is broken for a good week or longer,, go look in the site boards there is a thread about the search feature being down


good luck

 

For the short time that I had a TH350, I simply welded on a plate extension for the mount.

 

Zot_Man

I have a B&M 350 install kit w/torque arm adapter for sale if you are interested. Bolts a 350 in with stock crossmember and rubber mount.

Also have a B&M ratchet shifter from my 87 Z-28.

Tmaloney

 

yo tim did u ever install that b&m bracket cuz i cant figure how that torque mounts to the backet itself if anybody know tell me plz.

 

All I did was grind the rivets off the stock rubber mounts and bolt them to the B&M bracket. It was 12 years ago, but I remember that I did not need any parts other than the ones in the kit and the stock rubber mounting pads.