To much gear oil?
Thread Starter
12 Second Club
Joined: Dec 2008
Posts: 319
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From: Richmond,VA
To much gear oil? Just got my car back from shop again because of pinion seal leak, he said he put to much gear oil in it and thats why its leaking. Is this true that to much oil will make it leak from pinion, because its still leaking. I think it leaking from seal defeats the purpose of a seal, I dont know Im not a mechanic. the car is a 01 formula with late model pinion seal.
Thread Starter
12 Second Club
Joined: Dec 2008
Posts: 319
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From: Richmond,VA
It was coming out of fill plug but its not now just pinion seal, I have the 10 bolt with a T/A cover, I think the guy was just tryin to blame the leak on overfill just so he didnt have to actually inspect or replace seal.
>>the gm procedure for replacing the pinion seal,, you measure the pinion rotating tq with the brakes/ rotors removed so you are just free spinning the carrier/ axles,, get that measurement, remove the pinion yoke, replace the seal,, then tighten the pinion nut to your original rotating tq measurement + 3 inch pounds tq.
i never tried this my self.
good luck Johnny
i never tried this my self.
good luck Johnny
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Joined: Sep 2010
Posts: 233
Likes: 1
From: Long Island, NY
Wow! that is a amazing answer, almost as bad as the one i heard yesterday...
"not to put new gear oil in, because it will wreck everything"
The seal is leaking.... When i do a serious off-road diffs i over fill them, reason being they're going to be doing things with the truck that shouldn't be done, like playing submariners, and sand hogs...
So I over fill, run the breathers to a quick location to be closed off so the diffs have positive pressure in them....
In that case it is better to push out then draw in water and sand....
So you simply have a bad seal.....
Measure the pinion drag you have now and then put it back at the same drag without going more.....
So if you have lets say 20 INCH pounds of load, you want it back at 20 INCH pounds of load.....
and when you get close make sure and tighten it with tiny increments,,,,, like a 1/8" pull on the breaker bar... NO impact guns....
Put blue loctite on the threads when you put the nut back on...
"not to put new gear oil in, because it will wreck everything"
The seal is leaking.... When i do a serious off-road diffs i over fill them, reason being they're going to be doing things with the truck that shouldn't be done, like playing submariners, and sand hogs...
So I over fill, run the breathers to a quick location to be closed off so the diffs have positive pressure in them....
In that case it is better to push out then draw in water and sand....
So you simply have a bad seal.....
Measure the pinion drag you have now and then put it back at the same drag without going more.....
So if you have lets say 20 INCH pounds of load, you want it back at 20 INCH pounds of load.....
and when you get close make sure and tighten it with tiny increments,,,,, like a 1/8" pull on the breaker bar... NO impact guns....
Put blue loctite on the threads when you put the nut back on...
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12 Second Club
Joined: Dec 2008
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From: Richmond,VA
Thanks for the feedback everyone, ill keep an eye on it to see if it stops leaking, hopefully it does, does anyone know what the part# is to the late model 01 or 02 pinion seal or what brand is a good one
Restricted User
Joined: Sep 2010
Posts: 233
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From: Long Island, NY
You do understand that when you are driving, the ring gear is slinging ALL the oil to the front pinion bearing, that builds up and is forced to the main pin bearing......
Now think about that for a moment.... now when the car is sitting and it has no pressure build behind the seal from the gear pumping the oil forward...and now it's leaking...
So keep that in mind, and now replay that reasoning/answer back in your head they gave you.
Both my trucks are over filled.... that's 4 diffs that aren't leaking...
Now think about that for a moment.... now when the car is sitting and it has no pressure build behind the seal from the gear pumping the oil forward...and now it's leaking...
So keep that in mind, and now replay that reasoning/answer back in your head they gave you.
Both my trucks are over filled.... that's 4 diffs that aren't leaking...
Restricted User
Joined: Sep 2010
Posts: 233
Likes: 1
From: Long Island, NY
When you replace the seal put a bit of oil or lite grease on the seal...
Some people wipe them all down and the end yoke and that isn't good, most seals come with a lite grease on them...
Some people wipe them all down and the end yoke and that isn't good, most seals come with a lite grease on them...
