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Old 06-06-2021, 05:18 AM   #1
OregonNed
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Join Date: Dec 2012
Location: Vancouver, Washington
Posts: 1,644
Gear ratio advice

My truck is currently getting its rear differential rebuilt (a lot of problems found internally). It currently has open carrier with 3.08 gearing, but here is my chance to change the ratio for a bit more umph! We are switching to Posi as well. I’m running 27in diameter tires, and I’ve studied the RPM charts. Now thinking about 3.42 or 3.55 for it. Any opinions on one vs the other? Running a 327 with TH350 trans as well. Thanks in advance
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1968 Chevrolet C/10 LWB - 327, TH350 - 4/5 Drop
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