Rear pinion seal
#1
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Join Date: Feb 2006
Location: Oregon
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Rear pinion seal
About 12,000 miles ago my rear pinion seal started leaking. I put a speedy sleeve with a matched seal. The other day it started leaking again, so I decided to check the gear oil level in the morning after it cooled off and when I pulled the fill plug there was a sucking sound when the plug was loosened. So I realized that the vent was plugged it was not in the hose but the actual fitting that vents the housing. I unclogged the fitting with some brake cleaner and put it back together and filled it as much as I could on the hill in my drive filling it about 1/2" above the plug then quickly put the plug back before it could drain back out(I dont know why!). The problem is it is still leaking......so did I just overfill it or did the pressure that builds while driving because of the clogged vent ruin the new seal? BTW the leak seems to be slowing but I did wipe it down to check and it is still seeping only while(after) driving at highway speeds.
#2
Registered User
The pressure may have rolled the lip of the seal out but it may stop leaking after a while. Mine was clogged and caused a wheel seal to leak but it stopped leaking after I unclogged it.
#3
Adminstrator-ess
What he said. You might have to replace it if it doesn't pop back into shape.
The correct fill level for the D70 is 3/8" to 1/2" BELOW the bottom of the fill hole. Excess usually winds up in your brake drums.
There's a link in the sticky to axle vent cleaning, seems it's common for them to plug up.
The correct fill level for the D70 is 3/8" to 1/2" BELOW the bottom of the fill hole. Excess usually winds up in your brake drums.
There's a link in the sticky to axle vent cleaning, seems it's common for them to plug up.
#4
Registered User
The seal on my Ford has leaked slowly, for years.
I found the vent is broken off at the axle-housing, and rusted/plugged solid.
Due to the huge rear fuel-tank being about two inches behind it, I can't get anything serious enough to remove it back in there.
The next time I have my cover off, I am going to invent a vent in it.
I found the vent is broken off at the axle-housing, and rusted/plugged solid.
Due to the huge rear fuel-tank being about two inches behind it, I can't get anything serious enough to remove it back in there.
The next time I have my cover off, I am going to invent a vent in it.
#5
Make sure your pinion bearings aren't worn out. That's the case with mine, as it was a farm truck that spent more time with a gooseneck full of cattle behind it than it did without. What's odd is that the rear diff doesn't whine or clunk under throttle transition.......but the distance I can move the pinion forward with the driveshaft disconnected is pretty scary. It's worth checking, as that will wear out seals quickly.
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