Help 10 Bolt 8.5‚ÄĚ ring and pinion pattern

mechanicmangg

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Dec 14, 2009
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Has been a minute since my last rear gear setup, and Im having a brain fart.
Do you all see any issue with this gear mesh setup?
It is going to be a street with occasional abuse. ūüė¨
Reused the factory pinion shim which is .036
Everything else is new.
Back lash is at .009
3.55 US Gear.

Thanks
 

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mechanicmangg

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Dec 14, 2009
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What do you think about this pattern?
5A2A3777-9465-4B14-9B4C-94FC48044780.jpeg
 

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t5montecarlo

MalibuRacing Junkie
Oct 21, 2007
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The new pattern looks like the old pattern.
How much smaller of a pinion shim did you use?
Do you have the ability to measure the pinion depth, and compare to the markings on the new pinion gear?

I hope someone else chimes in.
 

mechanicmangg

Member
Thread starter
Dec 14, 2009
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The new pattern looks like the old pattern.
How much smaller of a pinion shim did you use?
Do you have the ability to measure the pinion depth, and compare to the markings on the new pinion gear?

I hope someone else chimes in.
Yes, I do have the T&D Machine pinion depth tool and the Ratech pinion tool.
Both showed I needed a .011 pinion shim.
I use the .011 shim and I get a heel and toe contact.
Each time with a .009 back lash.

Have never had an issue like this before.
Have taken it apart and back together so many times.
And for some reason I cant seem to get a center drive and coast pattern. IDK...
 

t5montecarlo

MalibuRacing Junkie
Oct 21, 2007
4,435
11
38
Lederach, PA
garage-scene.com
The T&D Machine tool should be good. The Ratech tool is not so good.
Are you using the same bearings to measure the depth and view the wear pattern? I don't agree with the use of setup bearings.

As the pattern seems to be centered between heel and toe, you may be OK as is.
 

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