Ring and Pinion Gear Pattern Help
- Thread starter NashvilleTJ
- Start date
Thanks Blackjack.
Thanks Arg (you’ll always be Arg to me). I think I‘ll pull a thou or two out tomorrow and see if I loose that sharp line at the bottom. These 2 cut gears make a pattern like I’ve never seen before.
Alex0413
TJ Enthusiast
You're teaching me something new with these double cut patterns! I would've been bewildered too when I saw that!
I have a couple customers I sell the AAM gears (OE GM and Dodge) and they just throw the old pinion shim in set them a 4 thou backlash and let em eat. How they do not have more issues I do not know. Maybe we are just too picky when it comes to getting a pattern.
This one is too deep for me. You can see that on the coast side.
I don't know the actual pinion depth as I don't have a way to measure it. However, the inner pinion shim was 51 thou in post 25. In post #37 the pinion shim was 61 thou - so 10 thou deeper. I started at 49, and along the way I've tried 57, 54 and 64.
Although admittedly my earlier measurements are suspect. I've gotten better (read: more accurate) in my measurement of the shims since I started, and I went to a much more accurate micrometer about half way though. I think I've gotten better at getting a pattern as I've gone along - more consistent pressure, and adding a bit of oil to the pattern grease.
That having been said, I'll pull 2 thou - down to 59 - and see what happens.
I’ve had this caliper for almost 4 years. It’s proven to be pretty damn accurate and it always returns to 0.
https://www.amazon.com/dp/B00INL0BTS/?tag=wranglerorg-20
https://www.amazon.com/dp/B00INL0BTS/?tag=wranglerorg-20
it may not be the way most do it but i do not measure shim stacks, i measure individual shims and do the math.
when making changes i deal with 1 shim from each side.
it could be any 1 of the shims, but it's just 1.
when making changes i deal with 1 shim from each side.
it could be any 1 of the shims, but it's just 1.
OK - once again into the breach. Pulled 2 thou out of the pinion shim, down to 59 thou. Set backlash to 6.
Still looks like good clearance at the top on both sides. Does it still look too deep?
Still looks like good clearance at the top on both sides. Does it still look too deep?
It does look deep still. BUT you are getting very close now. Since you've been in there 100 times now
LOL, you might try taking ten thou out and see what it looks like. Then you will for sure be bracketed and can get it perfect from there. My guess is that another three thou will be perfect.
Thanks for the help, @hosejockey61. I've been down in that area - here's what a 51 thou pinion shim looks like (8 thou less than the current), backlash at 7. The pattern runs off the top of the tooth on the coast side. Am I reading this right?It does look deep still. BUT you are getting very close now. Since you've been in there 100 times now
Alex0413
TJ Enthusiast
Winner Winner, Chicken Dinner! This is the best one You've posted so far.
Help me understand that. Again to me it looks like the pattern is running off the top of the tooth on the coast side, and not centered between the root and the top. Everything I’ve read says that’s bad. What am I missing?
Alex0413
TJ Enthusiast
On
On normal gears, I wouldn't run this pattern. But on the feedback I'm seeing from the off patterns on double cut gears, and this is the best you've gotten, I thought it was acceptable. So on the patterns that are centered and too deep, once you start to back out the pinion, it gets angled and high? Tighten up the BL to 005" and see if the pattern centers better
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