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Location:
Canberra
Registered:
September 2003
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Checking Diff Ratio ?
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Thu, 30 June 2005 08:35
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Anyone have any idea if its possible to check a diff ration without removing the diff ? Ie: Revolution of drive shafts to tailshaft or something ?
Cheers
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Location:
Melbourne
Registered:
May 2002
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Re: Checking Diff Ratio ?
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Thu, 30 June 2005 16:32
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STOLEN FROM HERE
http://home.4x4wire.com/erik/diffs/#ratios
For "open" diffs:
* Block the tires at one end of the vehicle to keep it from rolling, and then jack up a tire on the other end.
* Place the transmission in neutral and release the parking brake if you are checking the rear diff.
* Spin the tire exactly TWO full revolutions while at the same time counting exactly how many revolutions the driveshaft spins (marking the driveshaft and tires beforehand will make it easier to count revolutions).
* The number of revolutions the driveshaft spins is your gear ratio.
If it spins just over 4 times, then the ratio is probably 4.10; 4-1/3 = 4.30; 4-1/2 = 4.56; just under 5 = 4.88; 5-1/3 = 5.29, etc.
For limited slip (LSD or "posi"), locking differentials, spools, etc.:
* With these types of diffs, you won't be able to turn one tire w/o the tire on the opposite side of the axle turning with it.
* In this case, follow the directions above except raise both tires off the ground and turn them exactly ONE full revolution while counting driveshaft revolutions.
* Again, the number of driveshaft revolutions is your gear ratio as mentioned above.
dan
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