Diff Gear Pattern
Lead Driver
Joined: Jun 2013
Posts: 5,648
Likes: 893
From: north of Minneapolis, MN
Well, .003 to .009 is quite a bit of difference. Does it vary that much when you are checking in 3 or 4 spots? A very knowledgeable friend said, "You need some room for gear lube in there." But, it is the front...limited use and probably not a bunch of long term torque on it.
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
Likes: 423
From: Long Island USA
Wait, the backlash changes that much? Is the diff carrier new or used?
Whenever I did a ring and pinion, the backlash was pretty much the same everywhere around the ring gear.
When there's a spec for backlash, like .006 to .010, it means it could be .006, it could be .010 - not that it can vary between .006 and .010
Whenever I did a ring and pinion, the backlash was pretty much the same everywhere around the ring gear.
When there's a spec for backlash, like .006 to .010, it means it could be .006, it could be .010 - not that it can vary between .006 and .010
Lead Driver
Joined: Jun 2013
Posts: 5,648
Likes: 893
From: north of Minneapolis, MN
Did you hone that back of the ring gear prior to installing it. Set up your indicator so that you check the ring gear run out while spinning the carrier.
The ring gear bolts are one time use.
The ring gear bolts are one time use.
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New User
Joined: Jun 2019
Posts: 23
Likes: 0
I did hone the back of the ring gear prior to installation but maybe not enough. I will try to set up the dial indicator on the ring gear tonight and check the runout.
Thank you for the suggestion
Thank you for the suggestion
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New User
Joined: Jun 2019
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I checked the ring gear runout and I am not getting very much variation maybe .001-.002
Moderator
Joined: May 2004
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From: Home Base Nebraska
I don't want to high jack this thread but I have a quick question, I changed my rear U joint on my F150 today and there is 1/8 rotation when turning the pinion. It has 130K on it and just wondering if I may have a start of future problems or just normal wear.
Denny
Denny
FTE Leadership Emeritus
Joined: Jul 2002
Posts: 42,561
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From: Long Island USA
Denny, is it a limited-slip or open diff? If open, might be somewhat normal. The spider gears can really add some rotational "slop" at the pinion. On the other hand, check the magnetic fill plug for metal 
