What kind or car and what engine/transmission?
Assuming the new one's a 700R4 and the old one's a T-350, you'll probably need to shorten your drive shaft. Measure both transmissions to make sure, because T-350's came with at least 3 different lengths. You'll also need to figure out a way to address the different position of the transmission mount. The 700 mounts farther to the rear.
http://tciauto.com/Products/TechInfo/trans_dims.asp has dimensions for popular automatics.
Assuming the new one's a 700R4 and the old one's a T-350, you'll probably need to shorten your drive shaft. Measure both transmissions to make sure, because T-350's came with at least 3 different lengths. You'll also need to figure out a way to address the different position of the transmission mount. The 700 mounts farther to the rear.
http://tciauto.com/Products/TechInfo/trans_dims.asp has dimensions for popular automatics.
