new 4l80e install what rear gear to run
01-17-2009, 12:45 PM
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new 4l80e install what rear gear to run Hi,I have just installed a 4l80e trans into my old street rod.The motor is a 04 ls1 with twin turbos and the converter is a yank sc3000.The rear gear is a 373 and was wondering what others run for a gear on a STREET CAR?I will drive it 95% of the time on the street with the a/c on but still want to have some *****.I was thinling a 307 gear.The od trans has a steep first/2nd gear so I think it will have a nice hole shot on the street and still have some highway mileage right???
01-17-2009, 05:47 PM
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It also depends on what you engine torque curve looks like. I would leave the 373 for the launch since you are running the factory 2.48 ratio first gear. Especially if you use it a a daily driver.
01-17-2009, 08:48 PM
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I just ordered a 9'' with 3.89's so we will see how that works out with the py3600 and the spray outta the hole that 2.48 sucks but im hoping by switching from 3.23-3.89 it will make a nice different outta the hole.
01-18-2009, 03:43 PM
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The motor is all stock except good valve springs and the twin turbos.I do want to get on the expressway and go across a few states to the goodguys rod runs with the car with the ac on and get some mileage.What rpm s do you guys turn at 70 mph?Please?
