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Old 08-13-2020, 09:38 PM   #7
mongocanfly
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Join Date: May 2015
Location: Alabama
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Re: Rear differential help please

Heres a rpm calc to help you out...
http://www.csgnetwork.com/multirpmcalc.html

Your turning a little over 1800rpm at 65mph..with a 31in tire and a .7 od with 3.73s
I try to set mine up to turn 2k at 65mph..seems to be the sweet spot for me.
If you were starting from scratch I'd say 4.10s...since your already 3.73s I wouldnt waste the money to swap it
But your 3.73s should be fine if you have a good tune..
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Mongo...aka Greg

1981 C30 LQ9 NV4500..http://67-72chevytrucks.com/vboard/s...d.php?t=753598
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Columbus..the 1957 IH 4x4...http://67-72chevytrucks.com/vboard/s...63#post8082563
2013 GMC Z71..daily driver

Last edited by mongocanfly; 08-13-2020 at 09:43 PM.
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