ACDelco GM Original Equipment 10-4003 Limited Slip Axle Lubricant Additive - 4 oz

Rear differential had a groan on cold startup making sharp turns. GM service bulletin for this issue advises to replace the fluid. I learned from some others that this conditioner will work magic on the issue. I performed a drain and fill with this conditioner and a full synthetic gear oil. Problem solved.

it work great

These are supposed to help with a grinding noise on my Chevy! TBD!

GM stopped making and stocking everything for this car. It's extinct. Parts are sparse. But gratefully this little bottle of magic still exists, and is affordable!Change your rear diff fluid every 18-24 months or every 15-25k miles if you own an 04-06 GTO. The LSDs are a metal on metal "cone type" design, so the amount and quality of FM you use is critical, as is flushing the fluid frequently to excrete metal slush in the diff housing.A quality 75W-140 gear oil works very well. Start with 2oz of the modifier, then ~1.5-1.8qts of the gear oil. Drive the car around for a while and listen to how the rear end sounds when turning and performing slow-speed maneuvers in parking lots. Add 0.5-1oz at a time to tune the diff.Let me know if you found this review helpful. 👌 🍺 ✌️

Needed it for my '68 and it was half the price of buying it locally

Perfect

Good gm productive at good price.

Bottle has changed. Nothing like the old one with the flip up spout. Takes up more room but same amount.