Dana 60 Runout Issue - New Gears

[ZombieK5]

I thought I finally got everything dialed in. I got the pattern pretty close, comments on that are appreciated, backlash was good at .007 and all other specs were in range. my final check was to see if backlash was the same around the entire ring gear.

I initially found the backlash to be .007 however when I checked different spots on the ring gear the backlash fluctuated to as high as .01 with other areas at .008 or .009. The tooth that is at .01 has adjacent teeth that are .009 and .008. I was extremely careful when installing the ring gear to make sure the surfaces were flat without any dirt or burrs. Would you have any recommendations for determining what is causing this runout.

Stats:
Dana 60 Front Axle
New Yukon 4.11 gears
New Eaton TrueTrac differential
New Eaton Master Bearing Kit

Photo of axle w dial indicator was included to show the setup.

Has anyone had this issue??

 

[6872xtc]

My limited experience is that it's common to have a variance similar to what you found. I don't remember how much I have seen with aftermarket parts though. I have been told that it's normal, so I haven't done anything about it. I just don't let the tight spot be under the minimum spec.

 

[Fastereddie]

Did you torque the ring gear bolts evenly?
If not, that could cause it.
But honestly, being that it’s a front axle, and .007 is your tightest and .010 is your loosest, I’d run it.

 

[Fastereddie]

My limited experience is that it's common to have a variance similar to what you found. I don't remember how much I have seen with aftermarket parts though. I have been told that it's normal, so I haven't done anything about it. I just don't let the tight spot be under the minimum spec.

Zactly…

 

[BoondocK5]

Common Machine specs are .002 -.006, IMHO, probably, good to go.

 

[ZombieK5]

Did you torque the ring gear bolts evenly?
If not, that could cause it.
But honestly, being that it’s a front axle, and .007 is your tightest and .010 is your loosest, I’d run it.

Torqued to spec (120ftlbs I believe) in criss-cross pattern and it was done in incremental levels.

 

[Fastereddie]

Torqued to spec (120ftlbs I believe) in criss-cross pattern and it was done in incremental levels.

Doesn’t get any better than that. I’m with @6872xtc just loose manufacturing tolerances

 

[ZombieK5]

Common Machine specs are .002 -.006, IMHO, probably, good to go.

Contacted "Gus" at Yukon end he sent me:

A few thou worth of back lash variation is acceptable, not ideal, but acceptable.

The proper way to determine the cause of the back lash variation is to isolate components so variables are not sacked.

This involves removal of the ring gear from the carrier, and checking for the run out at the carriers ring gear mounting surface its self. 0.001” worth of run out at the ring gear mounting surface translates to roughly 0.003 worth of back lash variation.

That said, based on what I see in your pattern, it looks to me like it could use a few thou more pinion depth.

My research today found that up to .003 runout is acceptable and mine is at that number. Would like it to be less...

Gonna add .002 to pinion and see where that get me.

 

[ZombieK5]

Did you torque the ring gear bolts evenly?
If not, that could cause it.
But honestly, being that it’s a front axle, and .007 is your tightest and .010 is your loosest, I’d run it.

Well... Added .002 to pinion and now the pinion preload is at 20. Should tighten some with the new bearing and seal. Ring gear backlash somehow now has less variation. It is mostly .007 with a few spots that are .008 and .006

Pattern changed. I really can't tell is the pattern is too deep into the root. Coast seems better bit drive is a lil questionable.

Drive is 2nd photo

Anyone??

 

[Wes Harden]

I actually like it. The drive looks like it has good clearance from the root.

 

[ZombieK5]

I actually like it. The drive looks like it has good clearance from the root.

Was worried about the knife edge line near the root suggesting it was too deep