[LUVMY04V]

What are your favorites to use for diff fluid??

Alot of us have a small wharble/whine and I have heard of royal purple and Amosoil but what exactly so you use. (links to buy product would be great too)

But yeah i dont trust my dealer to add the GM stuff so i would rather bring the fluid myself just want to know what to bring

 

[ccextra1976]

I use Amsoil for diff/trans and engine....

here is a link to Amsoil store front with full details about the product

I read about 15-20 threads about this before I made up my mind...


http://www.amsoil.com/storefront/svg.aspx

 

[Slithering_Joe]

AMSOIL SEVERE GEAR Synthetic Extreme Pressure Lubricant 75W-90 in the differential. I didn't need to add any friction modifier by using the AMSOIL lube. Figure-8 turns are quiet.
Their tests were convincing. (They better be true.)

-Mobil1 ATF in the transmission
-Mobil1 10W-30 in the engine

 

[UnsafeAtAnySpd]

I just put Amsoil in my trans, diff and engine a couple weeks ago.

 

[814V]

AMSOIL SEVERE GEAR Synthetic Extreme Pressure Lubricant 75W-90 in the differential. I didn't need to add any friction modifier by using the AMSOIL lube. Figure-8 turns are quiet.
Their tests were convincing. (They better be true.)

-Mobil1 ATF in the transmission
-Mobil1 10W-30 in the engine

joe,

is it quieter then before? what were you using before?

 

[shredder]

I put Amsoil SG 75w-90 and I added Amsoil slip lock additive just cause it was 7 bucks. I didn't have any noice in my diff to begin with so I don't have a comparison.

 

[Slithering_Joe]

joe,

is it quieter then before? what were you using before?

My original differential was really annoying with the whine and it whined all the time. When I made a sharp turn the clutches would rumble too every once in a while. That diff had about 25,000 miles on it until it was replaced last October. I have no idea if the gear oil in that was ever replaced.

The replacement diff had the factory 'grape juice' in it for the first 2500-3000 miles. At about the last 500 miles I started to hear the diff whine a little but only after the diff had heated up after a long drive. It's very slight and nowhere as noticeable as in the original diff but you can hear it. Doing a sharp turn under load, the limited slip clutches were quiet with no rumble there. I replaced the original 'grape juice' with the AMSOIL gear lube mentioned above and it still whines a little but only after a long drive just as before. I was hoping for a miracle but I know better. Making sharp turns under load it is the same - no rumble. I did buy the AMSOIL friction modifier additive just in case but I wanted to see how the diff operated with only the gear lube and no additive. AMSOIL says that their gear lube is compatible with limited slip diffs and should only add their modifier if you experience the chatter. With the new oil in I haven't experienced any clutch chatter or rumbling so the unused modifier sits on a shelf.

I highly recommend getting all the break-in material out with an oil change for the long haul.

 

[Twitch]

Before I installed the specter bushings, my diff didn't make any noise at all. After the install, it started whining a bit. Not too bad, but I heard it after 70mph, and it gets annoying on a long trip. Put in the Amsoil, and a few hundred miles latter, it's less noisy. You can hear it a little between 45-65, but at interstate speeds, I get nothing.
My 05 has 31K miles on the original diff.

Tony

 

[NormV]

30,000 miles on Royal Purple in transmission and differential with no failures. Probably increased gas mileage.


Norm

 

[814V]

My original differential was really annoying with the whine and it whined all the time. When I made a sharp turn the clutches would rumble too every once in a while. That diff had about 25,000 miles on it until it was replaced last October. I have no idea if the gear oil in that was ever replaced.

The replacement diff had the factory 'grape juice' in it for the first 2500-3000 miles. At about the last 500 miles I started to hear the diff whine a little but only after the diff had heated up after a long drive. It's very slight and nowhere as noticeable as in the original diff but you can hear it. Doing a sharp turn under load, the limited slip clutches were quiet with no rumble there. I replaced the original 'grape juice' with the AMSOIL gear lube mentioned above and it still whines a little but only after a long drive just as before. I was hoping for a miracle but I know better. Making sharp turns under load it is the same - no rumble. I did buy the AMSOIL friction modifier additive just in case but I wanted to see how the diff operated with only the gear lube and no additive. AMSOIL says that their gear lube is compatible with limited slip diffs and should only add their modifier if you experience the chatter. With the new oil in I haven't experienced any clutch chatter or rumbling so the unused modifier sits on a shelf.

I highly recommend getting all the break-in material out with an oil change for the long haul.

i just had my diff replaced at the last oil change. i am getting ready to change the oil and i was gonna replace the oem gm stuff with something else. i have about 2000 miles on this diff and now i am out of warranty so i am keeping my fingers crossed

 

[Civardi]

Amsoil now was running all Royal Purple. I put 75w-110 in the diff, they were out of 75w-90. Next time I might try 75w-140.

 

[ahahnu]

I tried the Amsoil, but without the additive. I may of had a better experience if I did. I have fresh bottles of Royal Purple ready to go in about a week or two.

 

[ccextra1976]

I tried the Amsoil, but without the additive. I may of had a better experience if I did. I have fresh bottles of Royal Purple ready to go in about a week or two.

what's the issue while running amsoil?