Testing limited slip differentials
Submitted: Sunday, Feb 26, 2006 at 14:35
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Redeye
Greetings,
Discussion over a beer on the longevity of limited slip differentials led to the question how do you
test if your LSD is working correctly. One suggestion was to jack up one rear wheel on a trolley jack and see if the other wheel would drive the vehicle forward or reverse. Did this and there was an attempt only to push the vehicle forward but the wheel off the ground spun.
Any suggestions
Redeye
Reply By: Exploder - Sunday, Feb 26, 2006 at 16:22
Sunday, Feb 26, 2006 at 16:22
1.Jack one rear wheel off the ground and grab a Torque wrench, you need to find out the Clutch load for the LSD (Call the manufacturer) for augments sake call it 20Ft/Lbs set the toque wrench and attach to a wheel nut and try to turn the wheel. If the wheel turns and the Toque wrench doesn’t click your LSD is worn or stuffed.
Or just try to turn the wheel that is jacked off the ground it should take a bit of effort to turn.
Alternately just pull a burnout on some gravel. LOL
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Follow Up By: Exploder - Sunday, Feb 26, 2006 at 22:25
Sunday, Feb 26, 2006 at 22:25
Just thought I would practise what I preached, never having actually tested it my-self.
So I jacked the rear right tyre off the ground leaving the rear left tyre firmly on the pavement, put transmission in neutral with the handbrake off.
The Traction Loc LSD I have should need around 28 Ft/Lbs to overcome the Culches in the diff, So it was out with the Toque wrench set to 28Ft/Lbs and placed it on a wheel Lug nut on the right rear and tried to rotate the tyre sure enough the Toque wrench clicked at 28Ft/Lbs just before the right tyre over came the LSD clutch plates.
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Reply By: Utemad - Monday, Feb 27, 2006 at 17:51
Monday, Feb 27, 2006 at 17:51
I have used Exploders method many times. Not the techo one but the fun one.
Park on grass/gravel/sand, put the clutch in, rev it, let the clutch out. If you leave two lines then your LSD works.
The LSD in my Rodeo has never been worked on or replaced and it still works after 184k.
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