Hi guys, You'll have to forgive me... I have owned and put many miles onto SM465's, TH350's, and 700R4's. This is my first driver TH400, and it's mated to a Diesel. I just got my `87 Suburban on the road earlier tonight after doing a "not in too much of a hurry" engine swap and a bunch of other work. Here's what the truck is... 1987 3/4 ton Suburban, newer 6.5L NA engine (~100k), TH400, NP208, 3.73 gears, 31" tires. Here's what the truck is doing... For being a Suburban with a Diesel, this thing's got one helluva holeshot. In first gear with mild to medium pedal, the engine winds up and holds the high R's for literally a couple seconds before it shifts into second. When it hits second gear, it tosses you back in the seat a bit then winds up, but not nearly as much, and shifts decent into third gear. It seems to do this without being too agressive on the skinny pedal. This is the first time I have ever driven a truck with a TH400 and I don't know if this is the way they are, whether it needs adjustment, or if this tranny is getting ready to split. Any insight is greatly appreciated.