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Thread: Rear gears
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08-14-2018 #1
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Rear gears
I'm building an 8.8 for my g body and looking for opinions on gear ratios. Cars weighs 3300, trans gear ratios are; 1st-3.01, 2nd-2.07, 3rd-1.43, 4th-1.00, 5th-0.84, 6th-0.57, engine is an 5.3 making about 400 wheel. Car has 4.10s now, but think it might be quicker with a 3.73 or 3.89. Car spends 95% of its life on the street and the occasional autox. Any thoughts?
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08-15-2018 #2
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What is your rear tire height?
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08-16-2018 #3
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Assuming 26" tall tires, the 3.89 rear would be a better match for the 3.01 1st gear off the line, than the 4.10s. And in 6th, you'd still be < 2200rpm @75mph. 3.73s would work well too.
Plus, with either the 3.73s or 3.89s; if you spin it up to 6300, you could actually hit 60mph in the top of 2nd before shifting (for 0 to 60mph bragging rights).Red Forman: "The Mustang's front end is problematic; get yourself a Firebird."
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08-16-2018 #4
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Thanks for the replies, sorry I forgot the tire size. It's 25.66" (275/40/17). Good points formula
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08-17-2018 #5
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If it already has 4.10s in it, just run them and see how you like it...
Andrew1970 GTO Version 3.0
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08-17-2018 #6
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The rear I am running now has 4.10s. The new rear is from scratch, I don't have heard yet
Originally Posted by andrewb70
If it already has 4.10s in it, just run them and see how you like it...
Andrew
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