Gear pattern check. - JeepForum.com
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post #1 of 49 Old 07-12-2020, 01:37 PM Thread Starter
greenmachine99
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Gear pattern check.

I’m regearing a dana 30 for my neighbor and just wanted an opinion on what I should do as far as pinion depth is concerned. This is at .010 backlash. To me one side looks good and the other side not so much. I’ve regeared things before but always struggle as to what I actually need to change when I don’t think it looks right. Thanks so much.

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post #2 of 49 Old 07-14-2020, 07:58 AM Thread Starter
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post #3 of 49 Old 07-14-2020, 09:30 AM
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Looks to me like your pinion is a little too deep.

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post #4 of 49 Old 07-14-2020, 01:24 PM
Jonny Jeep
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I'd agree with that.
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post #5 of 49 Old 07-15-2020, 10:22 AM
willis36
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A bit too deep for sure. And even though backlash is within spec, thats a touch looser than I like
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post #6 of 49 Old 07-15-2020, 12:11 PM
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Search and read the Bill Vista dana 60 gear setup bible. He does a very good job of explaining how to read the gear pattern and which changes to make to correct a specific problem.
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post #7 of 49 Old 07-27-2020, 03:06 PM Thread Starter
greenmachine99
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Added about .010 to the pinion and re ran it. This is with .006 back lash. What do you guys think?
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post #8 of 49 Old 07-27-2020, 03:32 PM
mukluk
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Still too deep. You want to remove pinion shim thickness, not add more.

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post #9 of 49 Old 07-29-2020, 03:13 PM Thread Starter
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Oops. I totally misinterpreted that then. So here I removed .022 so about .012 less than the initial pattern. This is with .007 backlash. To me it looks like the worst pattern yet.
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post #10 of 49 Old 07-29-2020, 04:26 PM
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That is worse that the first pattern but now we know it needs to be somewhere inbetween. With the pinion looking far too shallow on the current pattern, I'd add 7 or 8 thou to the current stack so it would be closer to the original, and see what the pattern looks like.
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post #11 of 49 Old 07-30-2020, 04:03 PM Thread Starter
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Added .008 to the pinion and ran it again. This is with .007 back lash.
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post #12 of 49 Old 07-30-2020, 04:37 PM
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The pattern is too shallow. Something doesn't seem right to me if there really is a difference of only .002" pinion depth between the very first and current setup.
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post #13 of 49 Old 08-01-2020, 03:19 AM
Jonny Jeep
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Went from 10 the wrong way to 12 the correct way and now 8 back, so this is four out from the original pattern.


Needs to be deeper again so I'd half the difference and add another two thou so it's two away from the original pattern.
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post #14 of 49 Old 08-02-2020, 03:20 PM
80cj
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On your first set of patterns, you were very Slightly deep. Your back lash of .010 was a bit on the loose side. The max recommended backlash for a D30 is .009 so you were really close. Since you changed your pinon depth. I would go to what you were on your first pattern but about .002 less depth shim and that should get you there. Another thing. When you take a pattern, apply marking compound conservatively and push your ring gear back and forth into the pinion several times. The pinion preload loads the gears and usually produces a nice clear pattern. Did you notice if there was a backlash number etched on the edge of the ring gear? Some gear manufacturers do that.
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post #15 of 49 Old 08-05-2020, 02:39 PM Thread Starter
greenmachine99
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Thanks for all the reply’s guys. I don’t get to work on this every day so sorry it’s taken so long. I added .003 to the pinion and ran it again. This is at .008 back lash. And yes, to the post above I did see a backlash. .006.
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