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Old October 15th, 2016, 05:49 PM
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5500 GMC 5500 GMC is offline
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Join Date: Nov 2013
Location: vaughn, washington
Truck: 1969 5500 V6
Age: 67
Posts: 19
Rep Power: 68
5500 GMC is on a distinguished road
Default Re: transmission swap

Thanks for the info !
GMC guy got me thinking and i re-figured the ratio by turning the wheel 10 times not 1 and doubling the drive line revolutions and came up with 6.20 as a rear end gear ratio
works out to 63.18 MPH at 2500 RPM
I do not anticipate there being a problem with pulling power, the new engine( 383 V8 452 ftlbs) has almost 100 lbs more torque than the existing one(351C V6 318 ftlbs) at 2500 RPM
new transmission 4L80e
thanks again for helping me to see the light at the end of the drive shaft
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1969 5500 351 V6 school bus, mods- 500 holly and duel exhaust
1951 3600 235 L6 pickup
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