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I don't think there is anything wrong with these transmissions, its just that the torque curve on the 6.2 is too narrow for the gaps between gears with a high ratio rear end, and not enough torque to cruise on highway. The torque converter on the 700r4 fills in the gaps some, and a blazer is...

I have one in a factory 1982 C-20 with a 6.2. It is cast iron, with the factory supplier Hurst shifer, the build code on mine is MM7. The truck is geared pretty high, not sure if it is 3:73 or 4:10. I do not think it is a very good match for the 6.2. On the freeway it can/could get up toward...