I'll try to slip this in because of the beginning production date of the TH-400.
My wife's 1987 Suburban, 6.2 Liter Diesel, which towed both of my trucks home, has a TH-400 in it. With 300,000 miles on it, and about half a body, (rust worms got the rest) The TH-400 may become available before too long.
Three basic questions:
1. Did the model used with the 6.2 Liter Diesel have different gearing than a gasser?
2. Somewhere I read that GM started producing a TH-400 HD in 1987, for the bigger (above half ton) trucks. How would I be able to tell if this transmission is an HD model.
3. If I replace an SM-465 with a TH-400, how badly will it affect the gas mileage?
