Quote:
Originally Posted by Yukon Jack
I'm guessing the gears are 3.73's and that is the problem. An easy way to check your gear ratio is to mark a line on your tire and driveshaft. Have someone move the truck forward very slowly so you can count how many times the driveshaft turns for one revolution of the tire. About 3 revolutions of the driveshaft will be 3.08 gears, 3 3/4 revolutions of the driveshaft will be 3.73 gears, a little over 4 revolutions will be 4.10's.
Doing it this way rather than jacked up makes it a little easier as you don't have to know if there is a locker or posi in the diff.
4.10 or 4.56 gears should keep the engine more in it's power band.
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Not that I want to start an argument, but it seems to me that if he has good power off the line but it falls off at higher speeds, he's probably going to have less power with 4.10 or 4.56 gears on the highway. The higher ratio gears would help more off the line.
I'd probably look at the points, do a good tune up, etc.