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Advice on a gear pattern


wallyss

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Hello, I don't post much. But previous theads have really helped me with my Ranger rebuild. I could use some advice today. I'm working on my first rearend rebuild. 8.8. New Ford 4.10 gears, 20in lb preload, .009" backlash, .027 pinion shim. What do you think of the pattern. Thanks20210418_164955.jpg20210418_165059.jpg
 


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19Walt93

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The coast side looks good but the drive side isn't really clear. Could you roll it back and forth a few more times and post the picture?
 

wallyss

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58726
20210418_192710.jpg and another
 

19Walt93

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That will work but I'd rather see the drive side with a longer contact patch. If you set it up using a pinion depth gauge I'd run it and not worry about the pattern.
 

wallyss

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Thanks. I was worried about the pinion being too deep. I do not have a pinion depth tool. I ordered a Ratech tool., and should have it thursday
I'm between .009 and .010 backlash. I'm thinking of adding .003 or so to the carrier shim. I know these gears are face hobbled, and a chart I found online shows tightening up to be the fix.
 

19Walt93

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I'd leave the backlash where it is, less than that is too tight in my opinion. How did you set the carrier bearing preload?
 

wallyss

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Ok I am hesitant running it at .008 too. I am getting .009 to .010 measuring 5 different spots
Running with 20 inch pound preload. (I am using a set up pinion bearing) All new bearings, all new gears and differential.
The Rearend had a .280 pinion shim originally , but that seemed to deep. And the pattern was even further off. with the same backlash
When I add the .005" shims to preload the carrier bearings wont that tighten the backlash further?
 

Roert42

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Should not have an effect if you add the same amount to both sides.
 

wallyss

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Yeah that makes sense I typed it and then realized it prob wouldn’t matter.
Should not have an effect if you add the same amount to both sides.
 

wallyss

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Measured the pinion depth with a ratech guage. Math says . 0274 shim. Here are some photos with a .028, and .009 backlash, 20 inlb preload 20210424_165944.jpg20210424_165907.jpg
 


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