04-23-2018, 01:17 AM | #1 |
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Join Date: Feb 2013
Location: az
Posts: 177
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Gear Pattern Help
Hello all, trying to set up this 9.5 14 bolt for my 96 K1500.
I got a junkyard diff, it has 300k+ but the ring and pinion looked good to me not being too shiny or sharp, machining marks still there.. So I installed all new bearings, and figured I could use the stock shims since I only replaced bearings. Now, with the stock big carrier shim, there was zero backlash. None at all. With this shim the pattern showed to need more backlash like you'd expect, but it would at least obviously mark the ring gear. I used install kit shims to get the backlash to .008, spec being .006-.010. Doing this leaves me with this pattern, that I can't really interpret as it doesn't look like any I've seen. It barely marks the ring gear, no matter what I do. Spinning the ring gear, spinning pinion pressing against the ring gear, spinning the pinion with a drill.. So, I tried to go from the .023 pinion shim to a smaller one, .020 then .018ish because it looks like the most definite mark it's leaving is pretty low. Neither had any effect nor made it mark definitely, real similar to what you see here. So, what do we think is going on here? I'm stumped, not that I have much experience as this is my first rear but this doesn't make much sense.. I would just throw all the stock shims in and run it, but like I said that ends with zero backlash.. Maybe this pattern is okay? The coast side looks okay I think, and you go off of that using used gears? |
04-23-2018, 04:27 AM | #2 |
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Join Date: Sep 2005
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Re: Gear Pattern Help
Please upload your photos here to the site and no photo bucket wr can not see ur pictures
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04-23-2018, 07:08 AM | #3 |
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Location: Hayes Va
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Re: Gear Pattern Help
Used gears can be hard at times. They will wear till they have a full contact like you are seeing and be just fine. On a used set I measure pinion depth and reset it back to that and set the backlash on the looser side of the spec and call it good. Has worked so far.
Jimmy
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04-23-2018, 11:50 AM | #4 |
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Join Date: Mar 2003
Location: Colfax-California
Posts: 8,391
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Re: Gear Pattern Help
You cannot set up used gears per-se......especially since they have 300+ on them. Put the original shims back in and set the back lash. Any changes you make can make those gears howl or sing. After 300 thousand miles they are going to have their own pattern
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04-24-2018, 07:17 AM | #5 |
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Join Date: Feb 2010
Location: Falls City, Nebraska "100 Miles From Nowhere"
Posts: 2,219
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Re: Gear Pattern Help
OEM shim thickness for 10.5 14-bolt is .017"...Stick the 0.18" in there and button it up. Backlash should be 6-10 thousandths...
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