Anyone using additive in Limited slip with amsoil

[JCasper]

I have recently hauled a couple heavy loads of hay from eastern oregon here to the valley. When I am loaded I get a chatter/vibration from the rear of the truck on slow speed turns. It really feels like the limited slip is grabbing like with a Posi-trac rear end. My 67 Buick Riviera does the same thing but it is alot louder and really bad in reverse. Someone on this site has mentioned that when I am loaded (I had 6300 lbs on the rear axle) that the driveline angles are wrong and that is where my chatter is coming from. I was curious if I should have some of the amsoil additive for limited slip rear ends in my differential. I am running the severe gear 75W-90 oil in it. I thought that I read somewhere that there was no need for an additive, but I may be wrong.



Thanks in advance,



Joe

 

[sag2]

Don't put any additive in, it will only hurt it, not help it. Is the vibration only taking off from a stop, or only when turning a sharp corner?

 

[JCasper]

It seems to be only turning a corner while taking off from a stop.

 

[DPKetchum]

There is a TSB for adjusting driveline angle with a LOAD.

 

[Edgemann55]

Been running Amsoil severe gear 75/90 for 3,000 miles with no problems so far-no additive.

 

[dmhollister]

Have been running Amsoil severge gear 75/90 for 25,000 miles WITH the additive and have had no issues. The additive I used was from amsoil. Before adding the additive had a very similar noise/issue even when unloaded. just another . 02

 

[amsoilman]

I have recently hauled a couple heavy loads of hay from eastern oregon here to the valley. When I am loaded I get a chatter/vibration from the rear of the truck on slow speed turns. It really feels like the limited slip is grabbing like with a Posi-trac rear end. My 67 Buick Riviera does the same thing but it is alot louder and really bad in reverse. Someone on this site has mentioned that when I am loaded (I had 6300 lbs on the rear axle) that the driveline angles are wrong and that is where my chatter is coming from. I was curious if I should have some of the amsoil additive for limited slip rear ends in my differential. I am running the severe gear 75W-90 oil in it. I thought that I read somewhere that there was no need for an additive, but I may be wrong.



Thanks in advance,



Joe

Your truck has the AAM differential, and does not have clutch packs in there, so the additional additive will not do anything for it. I think you have a different problem.



Wayne

amsoilman

 

[DPKetchum]

Amsoil Severe gear 75w90 with about 7k on it. Tow 6500 to 10k the whole time. No issues. No additive.

 

[roperteacher]

I had this experience, please read

I switched my 04. 5 to the AMSOIL and got the same result pulling my horse trailer. Come to find out Amsoil ALREADY HAD THE LS ADDITIVE BLENDED IN THE FLUID!!!!!!!! I never added it, but I sure got the chatter. As soon as I changed the fluid out to another hight quality brand, no more chatter!! Oo.

 

[amsoilman]

I switched my 04. 5 to the AMSOIL and got the same result pulling my horse trailer. Come to find out Amsoil ALREADY HAD THE LS ADDITIVE BLENDED IN THE FLUID!!!!!!!! I never added it, but I sure got the chatter. As soon as I changed the fluid out to another hight quality brand, no more chatter!! Oo.

Was that on the 2002 truck or the 04 1/2?

 

[roperteacher]

Amsoilman,



In my post above I put that it was on my 04. 5, Have only had the 02 less than 2 weeks. When I called AMSOIL they said that I had been sent the wrong fluid. I guess one has the LS additive in it, the other does not. I just haven't had time to order and wait for the new fluid to come in. I am certain AMSOIL is a great product and have heard likewise. . I just got the wrong stuff... roper

 

[JCleary]

What really is the problem, I wonder?



I currently have 46k on my truck. I change all the fluids at 15k intervals.



At 15k I changed out the fluid with the DC spec'd. synthetic, purchased at the dealer for $12/quart. Not long after, I started to have this chatter taking off around turns, especially when loaded or towing.



After about 5k miles and getting more annoyed with it, I picked up 5 quarts of Amsoil Severe Gear 75-90 and did the drain and fill.



The chatter disappeared. Now I run Amsoil in the trans and both axles.



I will say, however, that when I get near the 15k mark on the oil, the chatter starts to come back.



I think it's something related to the lousy LSD in our axles, not a lubrication problem. It seems the little brake shoes in the diff (I know, it's different than the Dana's) are pretty finicky.