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  Topic Review (Newest First)
08-26-2019 09:47 AM
jbolty thanks all. I'm gonna run it.
08-26-2019 03:24 AM
80cj
Quote:
Originally Posted by jbolty View Post
back at this. First time I've had a chance to touch it since June but our wheeling season will be starting before you know it.

just now I moved the pinion in about .005 and moved the carrier to the right about the same. backlash is ~ .007 ; was .015 before that
That looks pretty good. To get a good pattern imprint, try pushing (or rolling) the ring gear back amd forth against the pinion several times. the preload on the pinion helps produce a clear pattern. As for BL, .007 should be right in the ball park. Some gear manufacturers etch the backlash setting on the edge of the ring gear. Some times it's not that visible. Take patterns at 3 or 4 different points around the ring gear. They should all look pretty much the same. Here are pics of patterns I got when I did my friend's YJ D30. Gears were Yukon 4.88
08-25-2019 08:01 PM
Siva283
Quote:
Originally Posted by jbolty View Post
back at this. First time I've had a chance to touch it since June but our wheeling season will be starting before you know it.

just now I moved the pinion in about .005 and moved the carrier to the right about the same. backlash is ~ .007 ; was .015 before that
You can't ask for a much better pattern than that. It's about perfect for the d30
08-24-2019 01:49 PM
jbolty back at this. First time I've had a chance to touch it since June but our wheeling season will be starting before you know it.

just now I moved the pinion in about .005 and moved the carrier to the right about the same. backlash is ~ .007 ; was .015 before that
06-11-2019 05:27 PM
Climbit looks good.

try to remember oil this time.
06-10-2019 11:15 AM
Siva283
Quote:
Originally Posted by jbolty View Post
Good info. thx.

fun fact. My pinion does not have any shims right now, except the slinger
My 8.8 is that way. But the slinger counts and it is .002. I have notice with Dana/Spicer gears the pinion is usually that way.(Slinger only) And its is to get a perfect pattern with them. Yukon well I dont think I will but them again. I havent been happy with standard gear either. Yukon made the gears that will not set up properly in my D30 and I ordered a standard gear master kit that had a mix of Koyo and Timkin bearings in it which made set up a nightmare too. That happened twice before I just ordered one through Yukon that was all Timkin bearings.

I prefer Timkin thier tolerances are tighter than Koyo. When you make set up bearings and move to y our final bearings there will be a small change. With Koyo that change would take me out of spec with Timkin there was extremely little to no change.
06-10-2019 11:02 AM
jbolty
Quote:
Originally Posted by Siva283 View Post
Even for new gears that pattern is well within the good range. I had a similar on my 8.8 when I regeared and locked it. I have about 15,000 miles on it now and its looks great. Its got a dead on perfect wear pattern.

My D30 also got regeared and locked. My pinion however is way to shallow. I put every shim I could get my hands on. THe censensous seems to be those gears were machined improperly but they came with the jeep when I bought this one so I could return them. The edge of the tooth on the heel is wearing. I decided to just run it till they go then I will redo it. They still however are quiet and have been doing fine. THe backlash was right just the pinion depth is off.

While I am not advocated for sloppy patterns gears are a little more forgiving than people lead you to believe. I would totally run that pinion depth. I would try to tight the backlash up a hair though. Another .001 maybe .002 shim on the ring gear side should get you where you want to be
Good info. thx.

fun fact. My pinion does not have any shims right now, except the slinger
06-10-2019 10:19 AM
Siva283
Quote:
Originally Posted by jbolty View Post
Thanks for the feedback. I was a mechanic at a chevy dealer a million years ago and even though I am no longer in that business and have been working on cars for 40+ years have never set gears until recently. Several of the guys in my wheeling group have either been doing gear swaps or lockers and we figured it's high time to learn how to do it.

These are new gears. last fall I put in a used set in an emergency but they were pretty old and now that our wheeling season is over I'm putting in new gears and new bearings. I'll watch that video and then maybe shim out the pinion a little and take another pattern.

I'm in no hurry to get out into the desert right now. lol.
Even for new gears that pattern is well within the good range. I had a similar on my 8.8 when I regeared and locked it. I have about 15,000 miles on it now and its looks great. Its got a dead on perfect wear pattern.

My D30 also got regeared and locked. My pinion however is way to shallow. I put every shim I could get my hands on. THe censensous seems to be those gears were machined improperly but they came with the jeep when I bought this one so I could return them. The edge of the tooth on the heel is wearing. I decided to just run it till they go then I will redo it. They still however are quiet and have been doing fine. THe backlash was right just the pinion depth is off.

While I am not advocated for sloppy patterns gears are a little more forgiving than people lead you to believe. I would totally run that pinion depth. I would try to tight the backlash up a hair though. Another .001 maybe .002 shim on the ring gear side should get you where you want to be
06-10-2019 09:43 AM
87TPIYJ
D30 pattern

I am by no means an expert, but my father in law runs a Jeep shop and he is a guru with gears. I learned a lot from him setting up my gears on my tons.
Some tips:
- Solidly hit the ring gear back and forth with a dead blow once you drop the carrier in the housing. You would not believe how much extra back lash you can get from the bearings fully seating.
-CLEAN, CLEAN, CLEAN! We used like 4 or 5 cans of brake cleaner to make sure everything was bone dry and clean.
-If you have set up bearings (new bearings not used) that helps a ton.
- get a regular nut (non locking) matching the pinion threads and use anti seize on it when installing the pinion for checking pattern.
-A case spreader helps get the necessary preload on the carrier bearings.
-you can reuse a pinion nut once installed but not recommended. If you do peen the top edges and use a lot of red locktite.
- IIRC your seal will add 3 or so inch pounds to pinion preload measurement.
-with new bearings stay on the high side of preload spec range.
- your gears probably have a number ex ď.006Ē etched in the side. That is the backlash you want to run for how the gears were cut. (Mine was on the ring gear) the number in the pinion head is for pinion depth
- with a front gear things arenít as critical as a rear since its duty is less severe, but itís always good practice to do it right.

Here is a pic of my 14B. Notice the pattern is not a harsh cut off at the root. If you have a harsh line there then itís in all likelihood too deep. You are really close. I would just want to check with another shim just to see if your pattern gets better. Good luck. Itís not hard, but damn itís tedious!

06-10-2019 09:25 AM
jbolty
Quote:
Originally Posted by 87TPIYJ View Post
That pic looks like the pinion is not deep enough. The apex of the pattern (pointing from heel to toe) looks to be about 75% up the tooth towards the top land. You want it centered. Are these used or new gears? Carl Jantz put out a quick you tube video that helps give a basic understanding of patterns.

https://www.youtube.com/watch?v=nVb5WRUfM7Y
Quote:
Originally Posted by Siva283 View Post
On used gears that should be about perfect for the D30. When I did mine Dana and Yukon both said .03 - .06 backlash if I remember correctly. That was with new gears. SInce these are use you should be about dead on. The pattern looks excellent too.
Thanks for the feedback. I was a mechanic at a chevy dealer a million years ago and even though I am no longer in that business and have been working on cars for 40+ years have never set gears until recently. Several of the guys in my wheeling group have either been doing gear swaps or lockers and we figured it's high time to learn how to do it.

These are new gears. last fall I put in a used set in an emergency but they were pretty old and now that our wheeling season is over I'm putting in new gears and new bearings. I'll watch that video and then maybe shim out the pinion a little and take another pattern.

I'm in no hurry to get out into the desert right now. lol.
06-10-2019 05:59 AM
Siva283
Quote:
Originally Posted by jbolty View Post
backlash is about 6-8.
On used gears that should be about perfect for the D30. When I did mine Dana and Yukon both said .03 - .06 backlash if I remember correctly. That was with new gears. SInce these are use you should be about dead on. The pattern looks excellent too.
06-10-2019 04:22 AM
87TPIYJ
Quote:
Originally Posted by jbolty View Post
backlash is about 6-8.
That pic looks like the pinion is not deep enough. The apex of the pattern (pointing from heel to toe) looks to be about 75% up the tooth towards the top land. You want it centered. Are these used or new gears? Carl Jantz put out a quick you tube video that helps give a basic understanding of patterns.

06-09-2019 03:53 PM
jbolty backlash is about 6-8.
06-05-2019 04:07 PM
zrickety I think it looks really good. As someone else said, make sure the backlash is right and you're all set.
I got the paint from Summit pretty cheap with my ring and pinion order. Most bearing sets will include it as well.
06-05-2019 02:28 PM
jbolty thanks. Pretty happy it's this close without having to adjust anything yet. I'll get it squared away this weekend and follow up
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