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Old September 13th, 2012, 11:04 PM   #1
gli_ryan
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Default 8.8 paint pattern

I'm setting up my 8.8 for some 4.56 gears. I am installing used gears. Backlash .010 and I've got what appears to be a good coast pattern. The drive pattern isn't that good though. From what I read it's probably as good as it'll be able to get though. The paper I have says I should increase backlash if I want the drive teeth pattern to improve. But seeing as the coast pattern is really good I'm guessing the drive side is worn in a little to this spot. If I'm way off on this let me know, it's my first gear setup.

crappy night pics

drive gear teeth. Some look really good, some don't really look that good.


coasting teeth

Last edited by gli_ryan; September 13th, 2012 at 11:16 PM.
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Old September 13th, 2012, 11:06 PM   #2
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try and drop your backlash a little if possible, its riding a little far out on the teeth imo. used gears are a pita to setup and generally you wont get a perfect pattern.
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Old September 13th, 2012, 11:16 PM   #3
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Ok maybe I'll try that tomorrow. But the drive pattern I thought were in pretty much all the way, you can see the mark way down at the bottom of the teeth. Otherwise for used gears is it going to get really any better to make it worth the $25 carrier shim pack?
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Old September 13th, 2012, 11:28 PM   #4
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im sorry i was looking at it ass backwards, i thought it looked funny its been a long day. honestly id run with it. if you have any issues then address it then. but no i dont think its worth the 25 bucks.
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Old September 13th, 2012, 11:49 PM   #5
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Thank you!!
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Old September 14th, 2012, 10:36 AM   #6
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ugh, put new pinion bearings in and got the sleeve crushed. Backlash .003. Tried swapping carrier shims, no backlash. Flipped back over, backlash .001. wtf!
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Old September 14th, 2012, 10:45 AM   #7
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Welcome to setting up gears.....loads of fun!

I offer no help with your current situation other than to say I did my D30 w/ used gears and had it in and out over a dozen times, only to realize it was good the FIRST time in and I dicked with it over and over trying to make it just a little better.
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Old September 14th, 2012, 02:33 PM   #8
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Quote:
Originally Posted by gli_ryan View Post
ugh, put new pinion bearings in and got the sleeve crushed. Backlash .003. Tried swapping carrier shims, no backlash. Flipped back over, backlash .001. wtf!
so are the first two pics with old pinion bearings?

are you sure you have the pinion race seated properly (nothing stuck under the race)?

If your pinion is higher now, it will reduce your backlash. You need to verify your pinion depth before you can check for backlash and pattern
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Old September 14th, 2012, 03:58 PM   #9
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first two pics are old bearings I used to setup the gears, ground them so they would come in and out easier. Now I've got new bearings in and the crush sleeve in, all torqued down. I don't have any way to measure pinion depth, I just used the same shim with the new pinion.

I just got done messing around with backlash and have it set to .011, but here is my pattern. Everything I've read says the pinion depth is good but backlash needs to be increased.

drive


coast



sorry pics suck, I'm not sure how to make the paint turn out better and more obvious. Also from what I gather reading other peoples work with used gears its almost not worth trying to get a perfect pattern, is that where I am pretty much? I feel like it is.
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Old September 14th, 2012, 04:02 PM   #10
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I know the pattern isn't ideal, but I'm thinking about buttoning it up and moving onto the next project. I want to be able to wheel this thing one more time before winter. To test out the changes.
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Old September 14th, 2012, 09:06 PM   #11
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GO until she blows! It's part of wheeling.
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Old September 15th, 2012, 12:03 AM   #12
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Yep, she's all buttoned up now lol. Unless there is something way off and I can't drive it, I'm going to run it as is. Hopefully it lasts until the end of next year and I'll be happy.
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Old September 15th, 2012, 12:16 AM   #13
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Quote:
Originally Posted by gli_ryan View Post
sorry pics suck, I'm not sure how to make the paint turn out better and more obvious. Also from what I gather reading other peoples work with used gears its almost not worth trying to get a perfect pattern, is that where I am pretty much? I feel like it is.

Did you try putting some resistance on the carrier when you were spinning it to get a good pattern? When I did mine, I used a prybar to put some resistance/tension on the carrier and then I used an electric drill with the right size socket to spin the pinion around a few times. worked well and made the pattern pop quite a bit more.
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Old September 15th, 2012, 08:11 AM   #14
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I held onto the ring to try and put resistance on it, but it didn't work too well apparently. Would have been nice to have a second set of hands.
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Old September 15th, 2012, 07:47 PM   #15
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Yes you need to hold the ring gear to add resistance as you turn the pinion.

I was going to add that it's never a good idea to use used bearings as setup bearings. Things usually change when you change to the new bearings.
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Old September 15th, 2012, 08:07 PM   #16
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It looks like you pinion depth is incorrect.
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Old September 15th, 2012, 08:46 PM   #17
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Quote:
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I was going to add that it's never a good idea to use used bearings as setup bearings. Things usually change when you change to the new bearings.
Yeah I figured. The bearings looked better than they were I guess.
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Old September 16th, 2012, 08:36 AM   #18
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You can't spend a lot of time worrying about the pattern on used gears. Sometimes it will look ok but usually it looks off, but it really doesn't mean much with something already ran for any length of time.
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Old September 16th, 2012, 09:00 PM   #19
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Quote:
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You can't spend a lot of time worrying about the pattern on used gears. Sometimes it will look ok but usually it looks off, but it really doesn't mean much with something already ran for any length of time.
X2

I always go by the coast pattern on used gear sets. Buy a set of new pinion brgs and hone them to use as set up brgs, nothing shoud change then when you install the new ones.

I normally turn the ring gear with a wrench and put pressue on the pinon, you get a nicer pattern that way.
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Old September 17th, 2012, 11:32 PM   #20
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With both patterns on the toe like that you may be dealing with a bad initial pattern on whatever axle they came out of, or a bad bearing wear. Expect them to be noisy.
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