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Bad to overfill diff?


 
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srb96bravo
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Joined: 09 Oct 2005
Location: Golden, CO

PostPosted: Sun Nov 27, 2005 10:01 am    Post subject: Bad to overfill diff? Reply with quote

I had a slow leak from the pinion on my front diff (D30) and I had my water pump replaced and mymechanic said I would need to fix that sometime and said he topped off the fluid in the diff. On a trip this weekend, highway, I heard a new noise, similar to tire noise (changes with speed of vehicle, not RPM) but definitely a new noise. I thought wow, maybe the diff lost a lor of fluid and was making noise or something, so I go get some gear oil and get udner to check it. I get the fill nut loose, then take it off with my fingers, as soon as it was loose oil shot out a good two inches from the diff. That means it had to be filled at least a few inches above the hole right? Was it ok that he filled my diff up that much, I don;t see how it coudl hurt, just more resistance for the gears to turn in all that oil. Should I let it drain to the level of the hole or leave it where it is now(above the fill hole, I plugged it up as quick as I could, no pan, was expecting to add some oil not get shot at)?
Thanks
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Lowrider
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Joined: 08 Nov 2005
Location: Washington State

PostPosted: Sun Nov 27, 2005 11:28 am    Post subject: Reply with quote

The oil will expand a lot when it heats up. If you fill it to the bottom of the fill-hole when cold, you'll get a lot of oil out of it if you pull the plug when hot. Look at your owner's manual, but I'm pretty sure the level should be checked when the oil is cold.
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kizer
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Joined: 02 Jan 2004
Location: Marysville, North of Seattle

PostPosted: Sun Nov 27, 2005 11:08 pm    Post subject: Reply with quote

Its very true. Your fluid will change as it gets hot and cold. The best thing to do is make sure your front and rear vent tubes are not clogged. Worst case fluid will want to travel up the vent.

Heck I have RockCrusher diff covers installed and they hold nearly 1.25more quarts per cover simply because the fill hole is raised 2+ inches. Very Happy
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srb96bravo
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Joined: 09 Oct 2005
Location: Golden, CO

PostPosted: Mon Nov 28, 2005 4:36 am    Post subject: Reply with quote

thanks a lot, Scott
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