The engine and trans are from another pickup, and being a 91 should have the bugs and weaknesses flushed out of the transmission. The donor truck has a big toolbox body on it and was used for heavy hauling.
Should be no problems with transmission durability.
My wallet is already crying over how much gas it's going to take to use the truck to go and get the 91 drivetrain, then before I can tear into the swap I have one more, longer, trip to use the gas hog for. Have to pick up a load of metal lathe parts.
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