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How to Change Rear Differential Fluid

Changing diff lube yourself is easy
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Re: How to Change Rear Differential Fluid

Postby Copperhead » Mar 19 2017, 5:39am

It is even faster and easier on a 2500. The rear diff has both drain and fill plugs, even on the gasser 2500's. No need to fiddle with the cover. I can have all three done in a little over an hour. I do all of them at the same time.

For the traditional method, I am firmly in the LubeLocker gasket camp. Yes, they go on dry. No RTV, no sealer. And they are reusable. I have reused LubeLocker gaskets up to 3 times. Just make sure you put it back on exactly in the position it was before.
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Re: How to Change Rear Differential Fluid

Postby johnelectric68 » Mar 19 2017, 5:51am

Thanks, I have a 2007 Silverado LT 1500 crew cab 5.3 eng new body style, I think I'm going to take the rear cover off anyway to really clean out good with my hands, I won't spray any type of cleaner in there, I might have to replace the gasket, looks like a very small leak
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Re: How to Change Rear Differential Fluid

Postby johnelectric68 » Mar 19 2017, 5:52am

4x4
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Re: How to Change Rear Differential Fluid

Postby Waltheraustin » Mar 20 2017, 3:56pm

johnelectric68 wrote:Thanks, dealer want $548 plus tax just to change all three


Geez... that's so freaking expensive! If there were more DIYers out there they would be forced to lower prices. No demand and less busy would force more competitive prices. $548?!? That's just crazy!


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Re: How to Change Rear Differential Fluid

Postby guitargain » Jan 05 2018, 10:00pm

I have a 2014 Silverado z71 4x4 and I changed the transfer case today, using AMSOIL and had no problems. It took about 1.5 quarts.

I see where many in this thread says 5 quarts to do the front and rear differential. I am going to do this and noticed on the AMSOIL website is says it takes 3 pints for the front and 4.2 pints for the back. That would be 3.6 quarts right? Am I missing something or do most just like to have a little extra?
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Re: How to Change Rear Differential Fluid

Postby esox07 » Jan 05 2018, 10:56pm

A little extra. You don't want to come up short with the truck up on jack stands and a half full differential.
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Re: How to Change Rear Differential Fluid

Postby guitargain » Jan 05 2018, 10:59pm

esox07 wrote:A little extra. You don't want to come up short with the truck up on jack stands and a half full differential.

Figured that was it, thanks.
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Re: How to Change Rear Differential Fluid

Postby esox07 » Jan 05 2018, 11:09pm

Yah, every six months or so, a guy should check his diffs and top them off as well. Having that extra quart on the shelf in the garage is quite handy.
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Re: How to Change Rear Differential Fluid

Postby NCSU1500 » Jun 11 2018, 7:47pm

I have read people say not to use the additives. I bought Mobil 1 75w-90 synthetic gear lubriacant and it states on the bottle “limited slip friction modifier included.” Is this OK to use? Hoping I didn’t buy the wrong stuff. Thanks
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Re: How to Change Rear Differential Fluid

Postby esox07 » Jun 11 2018, 8:06pm

That subject has been hashed over dozens of times. The official word is NOT to use any lube with LS additives. However, a large portion of members on this list use Mobil1 75W90, myself included and have yet to claim any problems with doing so. The majority of lubes out there, do include LS additives, but I think it is very minimal and in some instances, some differentials require additional additives.

I intend to continue using it if that helps. Other options that I know of are AC-Delco lube from the dealer at about $20 a quart or I "think" AMSOIL has additive free lube. But also, fairly expensive.
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