[memo43]

I borrowed this from the intraweb

"Length And Weight
The TH350's case length is 21 5/8 inches. Depending on the tail shaft housing, its overall length can either be 27 5/8 or 30 5/8 inches. The 700R4's case length is 23 3/8 inches and its overall length is 30 3/8 inches. The TH350 weighs 120 lbs., while the 700R4 weighs 155 lbs."

Have you thought of the TV cable bracket as well as both drive shaft length.
the crossmember will have to be moved as well.