Help with gear contact pattern
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New User
Joined: Jan 2017
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Help with gear contact pattern
hello again, got things shimmed pretty close, I'm using same used gears I took out, same .030 pinion shim that was there, about .010 to .012 backlash. Contact on coast side looks about in the middle flank to face, drive side looks low toward flank. I've read not to go by drive side pattern on used gears, just the coast side.
Anyway, here are pics for any advice.
Anyway, here are pics for any advice.
Elder User
Joined: Aug 2011
Posts: 858
Likes: 2
From: Chico,CA.
I agree with what you're saying BUT... did you pattern it prior to teardown? Based on what I'm seeing, I think you're at the "happy medium" right now. If anything will get a person pulling their hair out, this is it. Welcome to the black art of differential work. I've run into the situation where I had what I thought was the perfect gear set-up only to have it whine somewhere, and then fix it by adjusting the pattern to something less ideal. I think you're good where you're at.
Thread Starter
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New User
Joined: Jan 2017
Posts: 17
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I agree with what you're saying BUT... did you pattern it prior to teardown? Based on what I'm seeing, I think you're at the "happy medium" right now. If anything will get a person pulling their hair out, this is it. Welcome to the black art of differential work. I've run into the situation where I had what I thought was the perfect gear set-up only to have it whine somewhere, and then fix it by adjusting the pattern to something less ideal. I think you're good where you're at.
Guess I need to get certified in the black arts..
Hotshot
Joined: Jul 2005
Posts: 11,931
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im a firm believer that all bearings are made to a TIGHT SPEC... So if you change the bearings and REUSE the gears, the pattern should be real close to what the factory setup... assuming you have good backlash.... I say your good to go !
Elder User
Joined: Aug 2011
Posts: 858
Likes: 2
From: Chico,CA.
Yes, bearing specs are very tight. I'd put it together just like it came apart. Every diff. adventure I've embarked upon involved re-gearing so of course it's a fresh start scenario - sort of. I've always had the original pinion shim work (pinion specs are pretty tight too, its the housing that varies). If you can play a tune with the gas pedal, you know you screwed up !!
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New User
Joined: Jan 2017
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Yep, I'm putting it together the way it is, only thing I did was shimmed closer to pinion to tighten up backlash, but ended up with about .555 total carrier shim, within .001 or .002 of original set up. Backlash is at about .012
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