I was looking at a K20 6.2 truck that was most likely a mid to late 80's style at a junkyard today. The guy said it was for sale as a whole and not a parts truck but just say I might be slightly interested I was just curious what automatic transmissions they put in those trucks? I know the TH700 is basically a 4L60 and wasn't usually considered a strong transmission which I would think came mainly in the light duty trucks but is the TH400 as strong as so many people make it out to be? I also understand the TH400 is just a 3 speed to which would result in less highway fuel mileage. I am curious which transmission most likely came in this truck because I don't really like automatic transmissions in a truck unless it's an Allison but the 6.2 doesn't have that much power anway.