What problems will i run into replacing my 700-R4 with a 350 tranny?? Will it work alright let me know?

 

You'll need a different cross member, longer driveshaft, and a torque arm mount. Look into a BMR set up they offer a few bolt in options.

 

I'm doing this conversion right now. If your th350 has a 9" tailhousing you will not need a new DS. B&M sells a conversion kit that comes with a torque arm adapter bracket, and a crossmember adapter plate, you will also have to order a $13.00 mount from GM.