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RIP Spring Creek Off Road
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6,013 Posts
Discussion Starter · #1 ·
anone donr this before.... or maybe have any idea what could have made this happen?? was trying to replace my pinion seal today and couldnt get the pinion nut to hold it tight... after some thinkin i gave up ad decided to just take off the dif cover.... saw this:shocked .... looks like i am regeraring now or grabbing a 10.25

hard to tell from picture... but it's groved pretty bad... this wore down the pinion gear too:banghead

 

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RIP Spring Creek Off Road
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6,013 Posts
Discussion Starter · #7 ·
jopes said:
bearings are shot
the pinion bearing was fine... or are you talking about the ones on the carrier?

Andy351 said:
loose pinion nut?
it seemed to be on there pretty dang tight... and now it's on all the way... as in i ran out of threads to make it go dow tighter. my brothers was loose once and we cranked it back down.... his didn't have these marks on the carrier


guess either of these could have been the problem.... the pinion is trashed now though
 

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Satyr of the Midwest
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17,738 Posts
How was the crush sleeve? If not the bearings, that's just about the only other thing I can think of off-hand.
 

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Premium Member
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3,109 Posts
I would guess that the pinion bearing cups weren't fully seated when the diff was built. I've see it a couple times, almost had it happen on one of my diffs. A buddy of mine had it happen on a brand new OX locker, destroyed the diff due to metal shavings.
 

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Premium Member
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307 Posts
Had the same problem on my Bronc. Was the pinion bearings, allowed the shaft to shift and strike the carrier. The shop was amazed that I could still drive the truck. The carrier came out in 4 pieces, took a tooth off the ring gear and several teeth off the spider gears. Have some pics around here some weres.
 

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negative creep
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8,651 Posts
sounds like the pinion nut got over tightened, once that happens your crush sleeve is junk and your pinion depth and preload is toast no matter how tight you make the pinion nut. at the very least you will need a new crush sleeve. (which btw should be more than "good and tight". its more like "tight as i can get it with my big ****ing impact gun")
 

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RIP Spring Creek Off Road
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6,013 Posts
Discussion Starter · #15 ·
joshbronco said:
Had the same problem on my Bronc. Was the pinion bearings, allowed the shaft to shift and strike the carrier. The shop was amazed that I could still drive the truck. The carrier came out in 4 pieces, took a tooth off the ring gear and several teeth off the spider gears. Have some pics around here some weres.
8.8s only have one pinion bearing .... making them more susceptible to this right??

oh wait... i don't care anymore.... i got a 10.25:toothless
 

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RIP Spring Creek Off Road
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6,013 Posts
Discussion Starter · #18 · (Edited)
Steve83 said:
They have 2, just like a 10.25" or most others. The 9" is an oddball with 3 because its pinion gear shaft is too short & weak without the pilot bearing.
yep... i just looked at the diagram again... guess i missed something last time and proceeded to confuse myself... just now i was looking for all your diagrams of stuff... it doesn't have a support bearing on the inside... but it still has two
 
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