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Why do you want to put a TH350 in a 91 gmc truck?Will a turbo 350 transmission work in a 1991 gmc truck?
It is not as effecient as a 4L60/4L60E as far as fuel usage goes but, the THM 350 is stronger .Anything can be done with enough time and money.
But it is not as strong, waste more fuel. Have you checked against your Make, mode, year,