ford 8.8 ring gear contact - JeepForum.com
 
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post #1 of 6 Old 05-30-2015, 11:43 PM Thread Starter
fearior
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ford 8.8 ring gear contact

So this would be my first axel build After measuring for pinion depth and setting the pinion bearing preload (without seal and crush sleve). I set the carrier bearing preload to .003" and the ring gear backlash from pinion is .004".
It appears that the contact is a little heavy on the toe end of the ring gear but to put the contact closer to center i would have to increase the backlash. Tolerance for the ring gear backlash is .003 to .006" i'm at .004" so im assuming this is ultimatly where my contact is going to be unless i'm missing something. Is it possible to achieve better contact and still hold tolerance on backlash.

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post #2 of 6 Old 05-31-2015, 06:54 AM
JeeperDon
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It's not clear from your text how you determined the pinion depth setting. I'd adjust it to correct this pattern. I measure nothing and just take the pinion in/out as needed, 6 times on occasion. I'd never just do some math and plug the pinion in, done, which sounds like what you did.

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post #3 of 6 Old 05-31-2015, 07:05 AM Thread Starter
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the contact suggests good pinon depth as it is in the center of the ring from bottom to top of tooth the issue would be setting the carrier further from the pinion to move the contact further from the carrier. and my ring backlash is good so moving carrier away from the pinion more would put me out of tolerance for backlash. or am i reading this wrong.
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post #4 of 6 Old 05-31-2015, 07:17 AM Thread Starter
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i used a ratech tool to measure pinion depth which in my opinon is garbage and is inconsistant. Well i see the merit to just reading contact for adjustment. I increased .010" shim to the pinion to achieve corect depth as it measures from the tool mabey i will go back .005" and see if this gives me a better contact pattern.
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post #5 of 6 Old 06-03-2015, 11:11 AM
StanF
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I'm 99.99% sure that the backlash spec is not .003 to .006.

The last 8.8 setup that I did I had it set to .009.

Here's a Ford setup guide:

http://fordperformanceracingparts.co...htM-4209-8.pdf
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post #6 of 6 Old 06-05-2015, 04:21 AM Thread Starter
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ya i got some bogus info. it's set at .011"
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