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Should my pinion move closer to the ring gear?

73K5BlazerSS

73K5BlazerSS

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I'm thinking my backlash is good.

What do you think about the pinion depth? Should it be closer to the ring gear to get the contact closer to the center of the tooth?

Sorry I don't speak all that technical ... heal ,toe drive coast, gets me confused.

If I move deeper with the pinion (closer to the center of the ring gear) will that mess up my backlash?

20230717_154839.jpg

20230717_154734.jpg
 
yes. it appears to be running off the bottom. what is your back lash ?

Back lash might change, out spec, but you can't run that.
 
Ok I see that it should be in the center more. To do that I would decrease the pinion shims, which would move the pinion forward away from the carrier? So the narrow end of the pinion gear makes more contact with the ring?

I would have done the opposite haha.

My pinion shim is .030 and the backlash ranges from .004 to .010. I read it should be .006 to .010 but if I go with more or less shims it gets worse. Is my .004 to .010 range odd ? I didn't think it would vary so much around the ring gear.

Thanks for the help
 
Yeah What bent said sorry I didn't stop to considered the direction. your back lash shouldn't vary that much. is the ring on flush with no debris between the carrier and gear ?
When you center the pinion it may be better or easier to shim the back lash. You should check/adjust back lash each time you move the pinion. Back lash will be controlled be moving the carrier left or right.
 
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Ok thanks. I'll try to reduce the pinion shim around .010 and see how it changes.
I'm thinking my large backlash range is probably from my dial indicator. I think its moving on me.
 
is this a 10 bolt ? Where is the pinion shim you going to change. I am thinking you need to go thicker here.
 
It's a 12 bolt, i started with a 030 shim. This is where I get confused regarding which way to move the pinion.
 
Ok I reduced the pinion shim to .024, and the backlash is .006.
I think it looks good as far as center of the tooth ? Is it too high on the ring tooth? To make it sit down more I'd have to decrease backlash right? I'm already at the minimum requirement.

20230718_144809.jpg

20230718_144645.jpg
 
I try to put as much tension on the gear as possible while running a pattern. It gives a better picture. I bet the pattern will move closer to the root if you can add resistance to turning the ring gear.
I don't understand how the pattern improved by a thinner depth shim. Should have made it worse
 
I gotta write this out so it makes sense to myself. I went with a thinner shim on the pinion which moved it back towards the trans. When the pinion hits the ring gear it's contacting the outer area more (away from the middle of the carrier. Previously I was looking at it from the back of the carrier... making me think I had to extend the pinion out towards the rear. Maybe that's what you're thinking also?
 
73K5BlazerSS said:
Ok I reduced the pinion shim to .024, and the backlash is .006.
I think it looks good as far as center of the tooth ? Is it too high on the ring tooth? To make it sit down more I'd have to decrease backlash right? I'm already at the minimum requirement.

View attachment 452433

View attachment 452434
Click to expand...
Is this the rear axle? If so your pics are of the coast side. Get some pattern pics of the other side of the tooth.
 
Wes Harden said:
I try to put as much tension on the gear as possible while running a pattern. It gives a better picture. I bet the pattern will move closer to the root if you can add resistance to turning the ring gear.
I don't understand how the pattern improved by a thinner depth shim. Should have made it worse
Click to expand...
Your thinking opposite
 
Fastereddie said:
Is this the rear axle? If so your pics are of the coast side. Get some pattern pics of the other side of the tooth.
Click to expand...
Oh crap I hope it's very similar, otherwise I've wasted alot of time. Yes it is the rear.
Thanks for the help
 
73K5BlazerSS said:
Oh crap I hope it's very similar, otherwise I've wasted alot of time. Yes it is the rear.
Thanks for the help
Click to expand...
Don’t panic, it should be fairly close. On a typical rear axle ring and pinion, the convex or domed side of the tooth is your drive side and the concave or dished side is coast. On a front axle it is the opposite. Until you get into reverse rotation/high pinion stuff like the very common superduty 60.
 
Ok I moved it around some. The pattern is a little cloudy, but am I too far towards the heel now ? Although if you look at the toe that's about the same distance from the edge as the heel maybe?

20230720_141003.jpg

20230720_140848.jpg
 
While I like the heel toe center of the pattern, it could be a little closer to toe. It appears to close to the face of ring gear.
Moving the ring gear toward pinion will adjust this.
What is your back lash with set current set up?
 
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