Rear
What is the rear end gear ratio and how does it affect performance?
Ive heard alot of people talk about rear end gear ratios and gears like 4.10 and 3.70 I really want to know exactly how they work. How can you change them?
It’s the ratio of how many times the drive shaft turns to how many times the axle turns and is set up by choosing how many teeth are on the ring and pinion gears.
Bottom line, the higher the ratio, the more power (Torque actually) at the rear wheels, also the higher your engine runs (RPM’s) and the poorer your gas mileage.
btw – higher ratio is reffered to as lower gearing (geared down) and lower ratio is reffered to as higher gearing … nice and confusing eh?
example, with a 4.10 gear set, the ratio is 4.10 to 1 so for every 4.1turns of the driveshaft, the rear axle will be turned one time and you will have a torque advantage of 4.1x
On the flip side for every say 10 turns of the wheels, your drive shaft will turn 41 times & your engine has to turn 41 times in high gear (not overdrive).
With a 3.70 gear, your Torque advantage is 3.7 times but now if your wheels turn 10 times, your drive shaft and engine will only turn 37 times. As with everything auto, always a trade off.
Changing is not difficult but is hardly a beginner project. Improperly set up and your rear end won’t last long. Easy enough though to pop off the cover, slip the axles out a few inches, and then remove the differential. Once that is out, unbolt the old ring gear and bolt in the new one. The pinion isn’t much harder. The trick is then shimming the differential so that the gears mesh properly and hit in the right spot. Any decent shop book should cover it well enough (Chilton’s, Hayes, ect) as well as most car/truck mags from time to time (Car Craft, Petersen’s 4 Wheel). A pretty easy one afternoon project.
Rear Window: The Kiss: My Favorite Film Scene
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