[Hx16457]

Just did this mod also (last weekend), I did have to cut my drive shaft only 2 inches & move the cross member and shorten my emergency cable to fit again due to moving the cross member closer to the rear-end.
I would recommend trying to find one (700r4) prior to 92, if possible.
It seems in 92’ the electronic speedometer was introduced via the 700r4. So if you get one after 92 it could have the electrical connection for the electrical speedo.. If you have a mech. speedo then you'll have to change the tail housing speedo (driven and drive gears plus connection housing) connection with a kit from Bowtie overdrives (or somewhere) about 80 bucks plus.
Also you might need a torque converter lock out kit, another 80 bucks plus. Then depending on the carb you are using and the TV cable bracket setup you have, you may need that (name brand carb) kit to align the TV cable properly. I have an Edelbrock so I needed the bracket for the TV cable that fit the 1406 carb. (JEGS I believe).
It does make a difference in the drive, and it is a lot of work!
Even more work if you have no lift!......... I had no lift, no trans jack either!

Oh my truck is a LWB C10, 1965 with 350 engine, and now 700r4 trans!
Do a little at a time, and keep moving forward....