Find your axle ratio...example w/pics.

[jtexfisher]

Just for fun...in case someone else likes to see it before they do it.

This method assumes no locker/posi etc. as my truck has open diffs and auto.

-Lift 1 wheel off the ground, block the truck, no parking brake or 'park' with auto.

- Mark the driveshaft/diff. housing for reference. Photo 'mark before'.

- Mark the tire and make a reference mark on the ground. Chalk mark and chalk on dirt in my case. Pardon the color..camera went flaky on that shot. Photo 'tire mark'.

- Rotate the wheel TWO FULL revolutions while counting the number of revolutions the drive shaft makes. In my case the driveshaft made 3 full revolutions plus the amount in photo 'mark after'. Looks like 3.08s on this truck.



jt

 

[muddybuddy]

sweet pink rims

 

[the beast]

Or you could just pop the cover and look for the numbers stamped on the ring gear.

 

[4xcrazy]

Or you could just pop the cover and look for the numbers stamped on the ring gear.

yeah, and change the gear oil while you're at it, probably hasn't been changed in some time if you've never had it off and figured out the ratio by then.