Author Topic: Gear Pattern  (Read 357 times)

Offline NickMaida

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Gear Pattern
« on: September 26, 2017, 07:57:34 PM »
Amateur question here. Is this pattern acceptable pic #1 or pinion too close pic #2? Is the difference just how far down to the root it goes? Because it is the same location left to right.



Good



Bad


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Offline NickMaida

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Re: Gear Pattern
« Reply #1 on: September 26, 2017, 07:58:19 PM »
Or maybe it just sucks either way.


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Online harryhood

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Re: Gear Pattern
« Reply #2 on: September 26, 2017, 08:00:52 PM »
Definitely no good. It's been to long since I did a repeat? I can't remember which way you need to go.
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Online MassXJ

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Re: Gear Pattern
« Reply #3 on: September 26, 2017, 08:07:22 PM »
Quote from: Mrs. Whoopie Pies
Then we have those guys that feel like constant cornmeal in ones pants . Alan for example.

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Online harryhood

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Re: Gear Pattern
« Reply #4 on: September 26, 2017, 08:09:18 PM »
So your coast side is to close to the and the drive side is to far to heel. What does the guide say for that?

The pattern on your ring isn't  close to the pattern in the pics. In the same general spot yes, but not the same wear pattern
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Online MassXJ

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Re: Gear Pattern
« Reply #5 on: September 26, 2017, 08:11:00 PM »
What's your BL at
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Then we have those guys that feel like constant cornmeal in ones pants . Alan for example.

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Online MassXJ

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Re: Gear Pattern
« Reply #6 on: September 26, 2017, 08:13:56 PM »
What did you have for marks on the old pinion and the new.  Numbers on the pinion
Quote from: Mrs. Whoopie Pies
Then we have those guys that feel like constant cornmeal in ones pants . Alan for example.

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Re: Gear Pattern
« Reply #7 on: September 26, 2017, 08:47:25 PM »
I'm pretty sure you need to increase pinion depth. How did you start your shimming process ? Are you using setup bearings ? Did you start with the idea devious pinion shim or some random number
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Re: Gear Pattern
« Reply #8 on: September 26, 2017, 08:49:13 PM »
Your coast side dosnt matter, you care about the drive side. As you get closer to the correct drive patter the coast will come in. You should also take a picture of the factory lapped pattern before applying yellow paint. Some gear sets will never run perfect.
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Offline NickMaida

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Re: Gear Pattern
« Reply #9 on: September 26, 2017, 09:06:21 PM »
From the factory it came with 1 large shim on each side of the carrier (weird?) and just a single .01 shim under the pinion. I'm using a setup bearing on the pinion. I started with the same thickness as from the factory and have since added .03 to the pinion and .02 to each side of the carrier.
I was at .012 for BL in that picture. I've since added one more pinion shim which brought BL to .008.
It centered it just a tad.
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Re: Gear Pattern
« Reply #10 on: September 26, 2017, 09:24:01 PM »
Keep adding pinion shim, you don't have to add carrier shim equally. Add whatever is needed to make the carrier snug in the housing with the preferred backlash. Once the gear patter is achieved shimming can be added to give the proper carrier bearing preload. Are there any markings on the new pinion ?
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Re: Gear Pattern
« Reply #11 on: September 26, 2017, 09:25:07 PM »
Your gearing is taking longer than needed because of that damn copper tube attached to the carrier
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Re: Gear Pattern
« Reply #12 on: September 26, 2017, 09:26:48 PM »
The tube get changed out every 40k
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Offline NickMaida

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Re: Gear Pattern
« Reply #13 on: September 26, 2017, 11:21:43 PM »
Your gearing is taking longer than needed because of that damn copper tube attached to the carrier

Lol. Believe me, I'm already regretting it.

So I think I'm getting closer!

I made the mistake of simultaneously increasing pinion and carrier shims when at first I had too much BL. That way I didn't realize that the big shims on each side were actually too large. I assumed that you started with those and shimmed from there. I was wrong. Those bad patterns were from the pinion being too close and the ring too far away. :/
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Re: Gear Pattern
« Reply #14 on: September 27, 2017, 05:19:39 AM »
Well it was a good learning experience what was your final pattern


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Offline NickMaida

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Re: Gear Pattern
« Reply #15 on: September 28, 2017, 10:07:25 PM »
This is the best so far. Do you think it should be further toward the root? It seems like it goes off the top instead of being an oval in the center.

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Re: Gear Pattern
« Reply #16 on: September 29, 2017, 03:25:51 AM »
That's most likely as good as your going to get it. This is where seeing the factory pattern comes in handy. By the book both patterns look in the center. What's the backlash ?
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Re: Gear Pattern
« Reply #17 on: September 29, 2017, 03:30:29 AM »
I don't typically use the painted section for reference, I use the teeth where the paint is transferred onto them. In the top photo, top 3 full teeth shown the pattern looks very much in the center of the tooth. Some times there is a backlash number etched in the ring gear. If you are close to that go for it. Usually you don't wanna be on the high end of the spec. Once the hearings wear in the axle will be noisy. Too tight is premature wear.
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Offline MattG

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Re: Gear Pattern
« Reply #18 on: September 29, 2017, 07:43:28 AM »
That looks like darn good contact to me, it's a jeep not a 1 ton truck laying down gobs of torque

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Online harryhood

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Re: Gear Pattern
« Reply #19 on: September 29, 2017, 07:55:33 AM »
drive side looks good. Are you checking on other teeth 180 and 90 degrees off from each other on the ring?
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Offline ctaxle

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Re: Gear Pattern
« Reply #20 on: October 09, 2017, 01:49:58 PM »
How did you make out with the pattern? BL should be 8/1000 or so. Arb im guessing?
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