Diff Backlash 80 Series
Submitted: Thursday, Sep 04, 2008 at 22:21
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Member - Ian H (NSW)
I posted a while ago about rear diff backlash and now can recommend a repairer in
Sydney. I used Speedy Differentials & Mechanical at Botany. Very good service and result from Jim, the owner and at a fair price. The diff is now like a new one.
I have no association with him other than as a satisfied customer.
Ian
Reply By: Kroozer - Thursday, Sep 04, 2008 at 23:31
Thursday, Sep 04, 2008 at 23:31
Sorry mate but its something i have never understood so i better ask the stupid question now. What is Diff backlash and how do you know when its happened? Cheers
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Follow Up By: Member - Ian H (NSW) - Friday, Sep 05, 2008 at 17:40
Friday, Sep 05, 2008 at 17:40
Hi Croozer,
Backlash is just the clearances between the meshing gears in the diff (or g/box for that matter) that allows the input shaft to turn some amount before all the clearances are taken up and the output shaft finally moves. The symptom is a clunk when you change gear.
It may be a bare minimum which is normal but in my case it was about 20 degrees rotation of the input flange before the axles stopped my effort to turn the flange.
Remedy was to overhaul the diff and bring the tolerances back to spec which meant a new crownwheel and pinion.
Bingo, no more backlash. Hope that helps.
Ian
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