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hoorders 05-12-2005 07:00 AM

differential fluid??
Well......spring is finally here and Ive been thinking of changing the rear end diff fluid in my 2000 z71. Its got a 5.3 in it and 373 gears. I bought it used so I have no idea if its ever been changed.

Got a question though.........I have some aftermarket diff oil unopened in my garage. Was planning to use it in my Jeep, but sold that. It says its good for all limited slip and posi differentials.

I was just wandering if this stuff is good to use in my chevy or should I get the fluid right from GM?

Also, do I need to add any other additives in with the gear oil?

Thanks again everyone..........your expertise is always appreciated.

4x4mike 05-12-2005 09:15 AM

Re: differential fluid??
You're going to need about 3 bottles of fluid. If you have a limited slip you should get a bottle of the additive from the parts store. When I used to buy it, it was in a little tube. One tube for the whole diff. You may need to use the opened bottle to top off what your 2 or 3 bottle don't fill. While at the store get one of those pump jobbers that screw on the the bottle. All you have to do is pump the fluid in.

Shorts 05-12-2005 09:53 AM

Re: differential fluid??
My experience was the same as 4x4mike. I bought 3 bottles of fluid and a tube of additive. The whole tube went into the diff, along with most of the 3 bottles...around 2.5 IIRC.

The pump is especially useful for the front diff. It was hard to deform the bottle enough and cram it into wierd angles trying to fill the front [img]/ubbthreads/images/graemlins/crazy.gif[/img]

hoorders 05-12-2005 10:19 AM

Re: differential fluid??
Awesome..............I will get the additive and change the fluid.

Thanks for all your help!!

Cosmo 05-12-2005 07:59 PM

Re: differential fluid??
As long as it is the proper weight for the Chebby....use it!!! You only need the additive if you have a limited slip or posi rear....if in doubt, put it in, it won't hurt with it....but it may without it.

One more thing....BUY A GASKET.....they seal SOOOO much better and longer than RTV silly cone ever will.

Ditto on the pump....I use the one I have for changing lower unit oil on my boats.....can't beat it, I'd NEVER go back to filling anything without it!!! Can get one at the marine section at Wally World for like $10 with a quart of 90W.

u4ia4 05-12-2005 09:17 PM

Re: differential fluid??
some of the NBS chevies takre a synthetic rear diff fluid. might want to look in the owners manual first. not all of them did, but i know that some that are in the shop require it....and its better might just want to go ahead and use it

Shorts 05-12-2005 10:10 PM

Re: differential fluid??
+1 for the gasket instead of RVT. I used RVT last change, and while mine didn't leak (much), it was still a balancing act putting on the cover and bolts while not messing up the nice RVT bead.

hoorders 05-13-2005 12:10 PM

Re: differential fluid??
Thanks fro the heads up on the gasket rather than the silicone.............I will also check to see if my rear end requires synthetic or not.

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