Ring & Pinion Advice

[Wes Harden]

It is really close if not there. If anything the pinion might be moved toward the carrier a smidge, very easy to confuse the direction moving the pinion has on the pattern. I am glad you are getting the results you are looking for. Though I don't agree that R&P need to be change when doing bearings. I have more bearing replacement, than ring and pinion installs

 

[Chickntrk]

I agree with Wes, maybe a few thousands in on pinion but you are very close

 

[texarback]

Thanks guys.

Wes, I see no reason why you are not right. It doesn’t really make sense to me that a big enough change could occur to throw everything off much less no lt be able to get some type of pattern.

What is head scratching is I can’t tell you how many times I worked on this thing with the old R&P and never could get a mark on the teeth.

I made the change and first time, bang. It does exactly what all the YouTubers do. I don’t get it.

Here is a pic from a month or so ago when I was working on it. Same shims, same preload as now…

 

[texarback]

You guys think the pinion needs to be moved in?


the pattern looks to me to be too close to the root. The Yukon book (picture an above) says that the pinion is too close. I assume that means too close to the ring.

I’ll follow y’all’s advice. I’ll increase my shim thickness and see what that does. If my brain is working right then that should cause the pinion head to move towards the ring.

 

[Wes Harden]

I see a faint impression on the drive side. Not sure why the pattern shows better on gears if doing the check the same and same marking compound

 

[texarback]

Attempt two. Added a little thickness to the pinion shim.

I’m at 6 thousands backlash.

 

[texarback]

I swapped the shims with one another and am at 8 thousandths backlash.

Unless anyone sees something amiss I’m going to button it up and run it as is.

 

[Blue85]

Anytime you change bearings, races, and shims in a diff; change the ring a pinion.

I have set up used gears multiple times with good results. I put used rear gears in my front axle many years ago, with no issues (which was the only time I moved gears from one carrier to another). I swapped a stock gov-lock carrier for an e-locker in my rear axle at least 5 years ago and it's all fine. I also replaced the pinion bearings last year on the non-serviceable Getrag rear diff in my Cadillac and so far it's been perfect. In each case I was able to get a good pattern using normal setup methods.

It does seem like we have a trend going here where nothing seems to give a good pattern and new gears fix it (there's another thread in the last few months). I can only assume there was weird wear/damage or the gears were super high mileage.

 

[BoondocK5]

I’m thinking the pinion is too close.

View attachment 466892

I’m shocked at how I can now get a pattern. I never would have thought changing the R&P would make that type of difference.

Just a skoash.
.010 should fix you right up.

 

[Wes Harden]

yeah I like it .006 or .008 is BL is good button it up

 

[texarback]

I have set up used gears multiple times with good results. I put used rear gears in my front axle many years ago, with no issues (which was the only time I moved gears from one carrier to another). I swapped a stock gov-lock carrier for an e-locker in my rear axle at least 5 years ago and it's all fine. I also replaced the pinion bearings last year on the non-serviceable Getrag rear diff in my Cadillac and so far it's been perfect. In each case I was able to get a good pattern using normal setup methods.

It does seem like we have a trend going here where nothing seems to give a good pattern and new gears fix it (there's another thread in the last few months). I can only assume there was weird wear/damage or the gears were super high mileage.

170ish thousand miles. Not high mileage by any stretch. Not sure what was going on. But, I’m happy to have this part done.

I hope the front is as easy.