ring & pinion pattern check pictures - JeepForum.com
 
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post #1 of 6 Old 12-03-2007, 09:44 AM Thread Starter
sportcoupe
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ring & pinion pattern check pictures

I just set up new gears on my 8.8 rear for the TJ and since it's only the second set of gears I've ever set up I'd like someone more experianced look at my pattern pictures. The pictures I left full size (2848x2134) so I posted a link to them.

I set backlash at 0.010" and my runout is 0.001". My pinion preload is 25 in lbs. with all new bearings.

Coast side picture
http://www.blackgto.com/jeep/coast.jpg

Drive side picture
http://www.blackgto.com/jeep/drive.jpg

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post #2 of 6 Old 12-03-2007, 11:26 AM
notmyj
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Your pinion preload is tight. Should be 14-19 in/lb. Backlash is bit tight as well it should be .011-.016"

The patern has good contact, but personally I would move the pinion back a bit (away from the ring gear) and adjust the stuff mentioned above.

Check here for tips. http://www.ringpinion.com/Content/Ho...lation_Kit.pdf


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If it has tracks, tires or tits, its gonna cause a problem.

"Everytime someone "upgrades" a D35, an angel looses its wings."

"Dizzy" - What SnoopDog would call a Distributor if he was a mechanic. I cringe every time I hear this moronic term

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Send lawyers, guns and money. The **** has hit the fan...
92, 4.0, AW4, 8.8, D30, 15x10, 37's, SOA etc, etc
92, 2.5, 30, 8.8, 4.88, Locked, Winch, 15x8, 35's, 3.5" (RIP)
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post #3 of 6 Old 12-03-2007, 11:43 AM Thread Starter
sportcoupe
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Ford spec on the 8.8 is 16-29 in lbs for pinion preload and .008-.015" for backlash. That is why I set mine as such. Still think it's tight?
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post #4 of 6 Old 12-03-2007, 02:31 PM
Nonya
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25 inch lbs is fine with new bearings....backlash 5-8 range if anyone tells you otherwise move on
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post #5 of 6 Old 12-04-2007, 08:37 AM Thread Starter
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Quote:
Originally Posted by Nonya
25 inch lbs is fine with new bearings....backlash 5-8 range if anyone tells you otherwise move on

So you're saying that the Ford spec for backlash is wrong?
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post #6 of 6 Old 12-04-2007, 08:51 AM
87Xota
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I've heard a couple different theories about backlash, some builders feel if the spec. for instance is .006 to .010, they try and get the setting as close as possible to .006 and they feel as the gears wear, the backlash will open up a little. And many builders feel regardless of factory spec's, .006 is enough backlash to allow lubrication to get between the teeth as they mesh together.

I haven't found that to happen, in gears that i've checked after they've been ran for awhile, the backlash seems to stay the same. I like at least .007 and have no problem going to the max of whatever the gear manufacturer specs are.

But i'm sure if you ask 5 different succesfull builders, you'll get 3 different answers.
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