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Gear Pattern Time - Dana 60

ZombieK5

ZombieK5

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With this being my first rebuild for a Dana 60 I thought I would post my first pattern to get thoughts. The Yukon Gear manual says that the pinion is too close to the ring gear. I am planning to remove 1 or 2/1000's from the inner bearing shims. Thoughts? All comments appreciated.

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Super close. I'd hit it with a 3 thou removal and see just where you land with that.
 
I'm having second thoughts about your pattern.

Here's a good explanation if you haven't already seen this.

 
Removed 2/1000 from pinion

Thoughts??

Backlash is at 7/1000 - lil tight but in range.

Carrier fell in easy. No back and forth on carrier but doesn't seem tight enough. May be over thinking this.

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My next step to what you have there is add 5 thou or something like that to the non ring gear side carrier bearing to put some carrier preload and potentially open up your backlash a tiny bit which might make you happier about your pattern.
 
obijuank5 said:
My next step to what you have there is add 5 thou or something like that to the non ring gear side carrier bearing to put some carrier preload and potentially open up your backlash a tiny bit which might make you happier about your pattern.
Click to expand...
5/1000 would push the ring gear closer to the pinion... Making the pattern deeper. If my thoughts are correct, wouldn't that REDUCE the carrier backlash with the ring gear closer to the pinion?
 
You add shims to the non ring gear side and that will push the carrier over away from the pinion. Add them to the driver side of the housing.
Doing that can accomplish opening up the backlash and adding carrier bearing preload.
 
obijuank5 said:
You add shims to the non ring gear side and that will push the carrier over away from the pinion. Add them to the driver side of the housing.
Doing that can accomplish opening up the backlash and adding carrier bearing preload.
Click to expand...
OK, I think I am misunderstanding you. Let me try it this way. The carrier has a ring gear with teeth on one side and bolts on the other. You are meaning that I should add shims on the side of the carrier the teeth are facing. Thereby pushing the ring gear away from the pinion.

I agree with that process and it will increase the backlash from the 7/1000 it is at. However, won't it push the pattern closer to the edge of the ring gear. It looks like the pattern is pretty close on the drive side.
 
More backlash is what we are after. It will barely influence the pattern. But it will.
 
I'm near New Braunfels now. Grew up in San Antonio and spent a little time in college in San Marcos too.
 
Dang we weren't far at all. I was at clemens just up the highway.
 
obijuank5 said:
Dang we weren't far at all. I was at clemens just up the highway.
Click to expand...
OK. 5/1000 added. 3 on teeth side and 2 on ring gear bolts side. Backlash now at 8/1000 - dead on the middle of the range. Had to give 4-5 good rubber mallet hits to get carrier in. Drive side pattern looks good. Not sure about coast.

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If you have everything in spec that's a runnable pattern. How easy does it come out now that it's square in the housing? Generally adding 5 to each side from no play sideways ought to get you where it needs to be. That is like a good bite with a prybar it comes out. Hard to explain.
 
obijuank5 said:
I'm having second thoughts about your pattern.

Here's a good explanation if you haven't already seen this.

Click to expand...
This video on gear patterns is the first one I have seen that says that the pattern should be a little on the low side because the gears riding up some under acceleration.
 
Around with shims a little bit more hoping to improve the coast side pattern. All I did was change the backlash to the high-end. I'm going to add 1/1000 to the side of the carrier where the ring gear bolts are which should bring the backlash back into spec. Any thoughts on this pattern?

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I'm over thinking this... I'm back at the gear pattern. Caught the 'Rona and was out for 2 weeks+.

I realized I kept going shallower and shallower on the pinion but that was wrong direction. Got it back in the ballpark. Backlash is 008 and pinion Preload is good. Thoughts anyone...everyone.

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