Join Date: Jan 2007
Location: Florida Panhandle
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If it is not limited slip....Take and jack up ONE side of the rear axles. Put a chalk mark on the driveshaft and the rear tire that is off the ground. Turn the driveshaft until the rear tire makes exactly 2 revolutions. How many times the driveshaft went around is your gear ratio. Obviously you won't be able to get 3.08 or 4.10 exactly, but if it is just under 4 then it is 3.73 if it is just over 4 then 4.10, etc.
If it is limited slip then just jack it up and do the same thing, but only do it for one rotation of both the rear tires. Same thing applies.
Make sure to chalk the wheels since it will need to be in neutral.
The other option is to take off the cover and count the teeth on the ring gear and pinion gear and then do the math. Divide the ring gear teeth by the pinion gear teeth. That would be your ratio.
Edit: Sometimes you can use the axle code on the door sticker too. Just google for the chart for that. I don't know a specific website.
2000 Ext. Cab F350 SRW, 6" Skyjacker lift on front/8" BDS Springs on rear w/NO blocks, 37x13.50 Nitto Mud Grappler's, Aftermarket Front Bumper
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