: Differential problems

05-04-06, 10:19 AM
I am currently having the second front deferrentail replaced on my 06 STS4.
Has anyone else expericed defferiantail issues?

05-05-06, 05:59 AM
What kind of fluid is GM using? Standard or synthetic gear oil?

05-06-06, 05:45 PM
I do not know. My guess would be synthetic since the oil was synthetic.

05-08-06, 04:05 AM
Any way to find out from the dealer? I'm wondering if they're using synthetic fluid now in replaced diffs, and if so, maybe this is a good preventative change for current STS/STS4 owners.

05-11-06, 10:18 PM
i haven't heard anything about differential issues but some of the sts4 owners are experiencing powetrain sluggishness during low speed cruising

05-26-06, 12:07 AM
Please note the posts under "06 sts awd transfer case leaking" on or about april 21 and you will see that there are some significant problems with the differentials. From my experience I had failed seals on both front and rear units at about 7k miles. they were replaced under warrenty and seem to be functioning at about 15 k miles. But I am watching closely.