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Re: Proper way to check Rear Diff Gear Ratio??
Quote:
Originally Posted by Yamariv
Finally go around to doing my rear diff oil change today and did the tire spin while counting the axle spins to try and figure out my diff gearing.
I tried the one full rotation of the rear tire and counted my drive shaft rotations which didn't even get around twice which I thought was weird. I then googled a video and one guy said you have to rotate the rear tire 2 full turns to find your gear ratio which seemed to work much better. By using the 2 full turn method, my drive shaft rotated 3 full turns plus a sliver. I'd guess that to be 3.08 or 3.10 gearing. Is the two full rotation the proper way of doing it?
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For an open differential two spins is correct. For a locker or a limited slip jack both wheels and spin once. You have a 3:08 ratio...Next time you have the cover off you can read the numbers on the edge of the ring gear to get your ratio. My 3:73 has 41-11 stamped on the edge of the ring gear, 41 teeth on the ring gear and 11 teeth on the pinion. Yours is probably 40-13...
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Michael of the clan Hill,
"Two Seventy Two's"
71 1-ton Dually 350 4-Speed
71 C/50 Grain Truck, 350 Split-Axle 4-Speed
02 3/4 ton Express
14 Indian Chief Vintage
1952 Ford 8N, "Only Ford Allowed On The Property" 
"Be American, Buy American" 
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