NAPA 68

iTrader: (1)

I am looking for some suggestions for the final cruise RPM for a stock LS1 / 4L60E combination. This is going to be in a 59 Bel Air so, weight is a consideration. After looking up some torque curves, I was thinking around 2200 @ 65mph. I am getting ready to select a diff gear ratio and had figuered some of you would have some suggestions based from prior experience.

Thanks,

Tim

Isolde

iTrader: (4)

If the LS1 is stock, it'll happily pull <1600 at 65 mph. And most of the bolt ons won't hurt that. Cruise rpm mostly needs to be matched to your cam.

Stu Cool

iTrader: (13)

With my nearly stock LS1/4l60e, 3.80-1 Gears and 28" tire I am between 21-2200 at 65. Works great, highway mileage is 27+.

Pat

code4

iTrader: (30)

My 54 has a 4l80 which is a slightly numerically higher OD with 26" tires & 3.00 rear will pull 8% grades without shifting out of OD while the cruise is on. these engines make good torque down low.

aknovaman

iTrader: (7)

Download, extract the files and run.
Be sure to use the Imperial setting for MPH.


http://www.locost7.info/gearcalc.php