I have an '89 Pontiac Firebird. I'm going to swap its factory 305 LO3 TBI engine to a 350ci/385hp Fast Burn crate motor. What is the best option: Keep the factory 700-R4 transmission or swap to a ...

GM’s line of Turbo-Hydramatic transmissions were some of the stoutest pieces ever fielded behind small- and big-block Chevy engines. But the TH350 and TH400 three-speed versions (and their two-speed ...