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    TH400 swap to 4L60E or 4L80E

    Truck: 1989 C2500 5.7 TH400 trans with 4.10 rear end Sitrep: Will need to tow a 20' car hauler all over the midwest this coming summer - about 5500 to 6000 lbs max never more. Question: What would you do? A) leave it alone be happy with 60 mph and 9 mpg. B) Leave TH400 in it and swap out to...
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