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Not likely, since the high gear in the 350 is 1:1 just like the 3spd, plus the convertor slippage could make it worse. You'd probably have to go to an overdrive to really help. A 700R4 would be just as easy to install as the TH350, you just need to run a hot wire for the lockup. Hope that helps.
60-66 Nut
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60 Ford F100 Custom Cab
61 Apache Short Fleetside
64 C10 Short Stepside
65 C80 409 V8 5spd(X-Firetruck)
83 GMC 350 Olds Diesel
85 GMC Short Bed
86 GMC Short Bed
90 GMC R3500 Crew Cab
92 GMC 1500
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