2006 differential fluid, now loose rear end

[SilveradoSS1618]

Hello Everyone,

 

This is my first post but I have been reading around the site for a while. I have a 2006 2wd SS and just changed my rear end fluid. I did not use any friction additives. I noticed the truck's rear seem to be loose while cornering now. I drove in a couple of figure eights to see if it would help but it still seems a little loose. I was reading in the "HOW-TO: Drain and Fill Your Rear Axle" forum and Mr. P said that the problem went away in 48 hours. Anyone know what the problem might be? Or should I wait it out and see what happens.

 

Also, I used 3 quarts of Mobil 1 in my 14 bolt rear end. The oil did not come up to the drain plug line, should I add more until the oil reaches the line?

 

Thanks for your help,

 

Paul

[Jonmalibuss]

I would not reccomend any sort of synthetic in any limited slip rearend. I ran into the same thing when I installed a new carrier so I switched to regular 75/90 and used the friction modifier additive and it works great now. The clutches in the diff will wear out faster with synthetic fluid.

[misterp]

You bought the Auburn right?

[SilveradoSS1618]

I drove the truck around for a little bit and the rear seems to have tightened up. I have the locking differential. For 2006, is an aurburn unit used or eaton G80? For other vehicles I have always used regular gear oil with a gm additive but I thought the differentials were sticking in gm trucks so additives are not being used anymore.

[RTStork]

I drove the truck around for a little bit and the rear seems to have tightened up. I have the locking differential. For 2006, is an aurburn unit used or eaton G80? For other vehicles I have always used regular gear oil with a gm additive but I thought the differentials were sticking in  gm trucks so additives are not being used anymore.

<{POST_SNAPBACK}>

 

There have been posts here about not using any additive (friction modifier) to the Eaton G80. I don't believe they use clutch packs like a regular limited slip or positrac so no additive is needed. I just swapped all fluids to Amsoil in the engine, front and rear diffs, tranny and xfer case. Mobil1 is good too. MPG seems to be up about +.6 to.8 too.

[orlando]

I drove the truck around for a little bit and the rear seems to have tightened up. I have the locking differential. For 2006, is an aurburn unit used or eaton G80? For other vehicles I have always used regular gear oil with a gm additive but I thought the differentials were sticking in  gm trucks so additives are not being used anymore.

<{POST_SNAPBACK}>

 

There have been posts here about not using any additive (friction modifier) to the Eaton G80. I don't believe they use clutch packs like a regular limited slip or positrac so no additive is needed. I just swapped all fluids to Amsoil in the engine, front and rear diffs, tranny and xfer case. Mobil1 is good too. MPG seems to be up about +.6 to.8 too.

<{POST_SNAPBACK}>

Dam that chick is hot!

[Jonmalibuss]

I drove the truck around for a little bit and the rear seems to have tightened up. I have the locking differential. For 2006, is an aurburn unit used or eaton G80? For other vehicles I have always used regular gear oil with a gm additive but I thought the differentials were sticking in  gm trucks so additives are not being used anymore.

<{POST_SNAPBACK}>

 

There have been posts here about not using any additive (friction modifier) to the Eaton G80. I don't believe they use clutch packs like a regular limited slip or positrac so no additive is needed. I just swapped all fluids to Amsoil in the engine, front and rear diffs, tranny and xfer case. Mobil1 is good too. MPG seems to be up about +.6 to.8 too.

<{POST_SNAPBACK}>

Not to be a smart ass but I don't think you have ever seen the factory gov lock. They do use clutches.

[SilveradoSS1618]

I called the dealer up and asked about information for a 2006. The rear takes synthetic fluid with NO friction modifier. It takes over 2 quarts but you are not to fill it to the plug line. On Thursday I will get a print out of the rear end specs.

[RTStork]

Not to be a smart ass but I don't think you have ever seen the factory gov lock. They do use clutches.

 

Ok no problem, I just didn't think the G80 uses the clutch packs typically found in a regular limited slip or positrac. I thought it was more like a gear locker. Thanks for the info.