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Old 03-21-2014, 11:19 PM   #1
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Dana 30 gear pattern check

Calling it quits for the night but I think I am getting close. What do you think of the current pattern?




Has a backlash of about .008"

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Old 03-21-2014, 11:26 PM   #2
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As blurry as pics are looks ok, looks good but not enough pressure applied to move paint. I love this link. http://www.billavista.com/Tech/Artic...ble/index.html perfect pics here. You are doing something I haven't done yet by the way. Just researched it.

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Old 03-21-2014, 11:41 PM   #3
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I am using a shop rag to put pressure on the ring gear as I rotate with the pinion. Maybe I need to apply more pressure.
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Old 03-21-2014, 11:46 PM   #4
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That link I posted is amazing. I love it. No way I would ask for advice here with that link honestly. Granted i got the link here. read it. It has everything.
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Old 03-21-2014, 11:56 PM   #5
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Calling it quits for the night but I think I am getting close. What do you think of the current pattern?




Has a backlash of about .008"
That looks like a great pattern. I'd run it if it were mine.
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Old 03-21-2014, 11:58 PM   #6
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That looks like a great pattern. I'd run it if it were mine.
He posted the awesome link lol! I'd go with him
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Old 03-22-2014, 12:11 AM   #7
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Be sure to have a tight carrier preload as the D30 tends to flex which can cause gear/locker issues. You shouldn't be able to pull the carrier out by hand. A lot of guidance I got said it should take 6-8 whacks with a dead blow mallet to get it back in. If you have to increase your preload, use an equal amount of shims on both sides but check your pattern again after doing so. Should still be good to go, but double check.

And those are some of the best pics I've seen of up close gear patterns.
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Old 03-22-2014, 08:44 AM   #8
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Be sure to have a tight carrier preload as the D30 tends to flex which can cause gear/locker issues. You shouldn't be able to pull the carrier out by hand. A lot of guidance I got said it should take 6-8 whacks with a dead blow mallet to get it back in. If you have to increase your preload, use an equal amount of shims on both sides but check your pattern again after doing so. Should still be good to go, but double check.

And those are some of the best pics I've seen of up close gear patterns.
x2. If it slides in fairly easy, add about 3 to 5 thousandths on each side (keep it equal). Looks like a great set up. I'd be ready for a beer.
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Old 03-31-2014, 09:26 PM   #9
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All assembled and my pattern is a little different. How does it look now?


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Old 03-31-2014, 09:34 PM   #10
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Pics look blurry to me. Like out of focus. Hosejockey is online so I wouldn't answer. He knows way better. They are blurry though.
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Old 03-31-2014, 09:35 PM   #11
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They are links to bigger pics. Did you click on them?
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Old 03-31-2014, 09:36 PM   #12
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Now it looks like your pinion may be too deep (into the ring gear). Precision gear has a good contact pattern chart www.precisiongear.com/pgtechpatterns.htm. It takes about .003" of shim change on the pinion to see a visual difference. Did you do your original setup with setup bearings (carrier) and race (pinion)? I've only used them twice but have learned that they too can vary a few thousands from what your actual bearings and can cause the pattern to change from what you thought you had. How much backlash do you have?
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Old 03-31-2014, 09:39 PM   #13
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They are links to bigger pics. Did you click on them?
No sorry on my phone when I click them it shows up as bigger blurry pics. Never had that happen before but never look at pics close like that often. Im surprised the links are showing up as pics to me. I'd shoot a pm to Hosejockey if I were you. Unless he posted while I'm typing.
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Old 03-31-2014, 10:01 PM   #14
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Now it looks like your pinion may be too deep (into the ring gear). Precision gear has a good contact pattern chart www.precisiongear.com/pgtechpatterns.htm. It takes about .003" of shim change on the pinion to see a visual difference. Did you do your original setup with setup bearings (carrier) and race (pinion)? I've only used them twice but have learned that they too can vary a few thousands from what your actual bearings and can cause the pattern to change from what you thought you had. How much backlash do you have?
Thanks for the link.
The only setup unit I used was the inner pinion bearing race and I made it from a new identical race as the permanent one. I had to make a few changes once I shimmed the pinion to get the correct inch/lbs of pinion turning resistance. The backlash was way off once the correct resistance was in force. I figured the carrier should be fine but just needed to fix the pinion depth. Looks like I may need to adjust the carrier again too. Bleh. Glad I have a bearing puller and a press.
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Old 03-31-2014, 10:05 PM   #15
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Old 03-31-2014, 10:10 PM   #16
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I'm assuming you were on the final assembly and already have the pinion seal and crush sleeve in. You'll have to get a new seal but if you are subtracting shims, you should be able to reuse the crush sleeve, you will just compress it more when you set the bearing preload on final assembly. I would disassemble again and first, make sure you have the new race fully seated. If so, I would drive it out and take about 4 or 5 thousands of shim out of the pinion race. Reassemble without a crush sleeve or the seal and reinstall the carrier and see what your pattern looks like first. On reassembly to check, tighten the pinion nut enough that you can turn the yoke with one hand (still a little stiff) but don't feel any rough spots like it's too tight.
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Old 03-31-2014, 10:19 PM   #17
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I am building a high pinion d30 so there is no crush sleeve. I just have a shim stack in there. I dont have the seal in there yet so the only thing that can get damaged is the oil baffle which I have a spare.
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Old 03-31-2014, 10:22 PM   #18
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Good deal. I've used the shim stacks in a couple of 9" Ford's before and really liked them.
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Old 03-31-2014, 10:34 PM   #19
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All assembled and my pattern is a little different. How does it look now?


Sorry, I'm always logged in so it may look like I'm here when I'm not!

Please understand that I am not an expert by any stretch of the imagination, however looking at your pics now, I would say it's just a hair deep. I think it's still a runnable pattern but if you are trying to get it dialed in perfectly then try subtracting .003 and see where that gets you. If it gets too shallow then I'd call this pattern good and go back to it.

Don't forget to check in multiple areas to make sure you are consistent.

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