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Thread: Rear End ratio help
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12-20-2004 #1
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- Oct 2004
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Darren, I have the same trans in my Nova with a 3.42 rear gear and 255/45/17 (26" tall). On the highway I run 2100rpm@70mph in 5th and pull down 17-18mpg.
Take a look at the bottom of this page and enter your info. This is in NO WAY an endorsement of Keisler, they just have a good rpm calculator on their site. According to this calculator 3.73s would only increase your 70mph rpm by an additional 300rpm.
http://www.keislerauto.com/gm/transm...evy2_68-74.asp
HTH,
Dan
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12-20-2004 #2
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Thats my combo!!
I run the The TKO600 and 3.73s in my car. I am currently running a 350 that doesnt really start making power until 2500 rpm or so. Unless your 383 is a real torque pig down low (under 2000) I wouldnt run anything shallower than the 3.73. It just makes the engine dog too much in 5th.
Take care,
Shane
12-20-2004 #3
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I agree with them. The 3.73 would be the perfect gear for your car.
Adam_______Offical Car Name "ILLUSION"
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12-20-2004 #4
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Ratio help
The motor makes good torque down low, basically a flat torque curve from 1500 - 4000 @ 400 ft lbs. Thanks for the reponse guys. Looks like the 3.73 (well in this case a 3.70 since I now have a 9 inch).
Darren
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