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rear pinion angle and level of fluid reaching pinion bearing

2001XJ

2001XJ

NAXJA Forum User
Location
Canton, MI
Anyone have an issue with rear pinion angle being just high enough to not allow high enough level of diff. fluid to lubricate pinion bearing properly? If so, how did you fix it?

I simply drilled and tapped a fill plug in the top of the diff cover and over filled the diff with extra fluid but eventually it will most likely work its way out the axle tube ends since the ends have dust shields, not proper seals.
 
Many aftermarket diff covers have a fill plug slightly higher than stock. If you are over-filling and the oil is blowing out the vent tube, or past the outer seals, you are over-filling way too much.
 
If you look inside the diff. Housing there is a passage over the top of the pinion. As you are driving your ring gear throws oil up that passage. The oil slinger keeps both pinion bearings bathed in oil by slowing the oil returning back down the diff.
 
Tim_MN said:
Many aftermarket diff covers have a fill plug slightly higher than stock. If you are over-filling and the oil is blowing out the vent tube, or past the outer seals, you are over-filling way too much.
Click to expand...

Yeah, I know but I wanted to make sure it was filled as much as possible to ensure proper oil level. The oil slinger apparently didn't do its job the first time or the level of oil wasn't high enough for the slinger to throw enough oil onto the bearing. I have over filled it and some of the oil has blown out the oil vent but since then stopped so I am assuming it has finally reached its equilibrium. I just hope the slinger can do its job now and I don't have a fail againl
 
As indicated in the thread, some diff covers allow you some flexibility. Take a look at the one I have on my D44 rear.

177533d1361899675-98-xj-limited-search-rescue-build-imag0143.jpg


My mechanic seems to say that you should fill to the recommended level and not more than that...
 
yaromb said:
As indicated in the thread, some diff covers allow you some flexibility. Take a look at the one I have on my D44 rear.

177533d1361899675-98-xj-limited-search-rescue-build-imag0143.jpg


My mechanic seems to say that you should fill to the recommended level and not more than that...
Click to expand...

Huh, the guys who rebuilt my front axle (do nothing but build custom axles for mud bogging and sand drags) told me to fill it up as much as possible
 
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