Re: 1987 GMC R3500 dually with th400
I used a B&M Traveler torque converter designed for towing and a 34 element sprag and a deeper pan with cooling tubes for mine along with a complete overhaul. I know there is more you can do but this is what my budget allowed. Look at mikestransmission.com and other simular sites to get more ideas. My 1987 Cab and Chassis already had the heavy duty transmission case. I ended up parking the truck after about 20,000 miles due to engine problems and not needing a heavy hauler anymore.
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