ACDelco GM Original Equipment 10-4034 (88862624) Dexron LS 75W-90 Gear Oil - 32 oz

Excellent product.

I bought this gear oil to replace the differential fluid on my 2018 Camaro SS and so far, so good! I mean it's OEM, so it better work! I had to buy a hand pump to get it flowing, but it was such an easy job, I think anyone can do it. The price seems to have gone up about $10 since I last bought it, but I think it's worth changing out if your car has never had it done before.

My 2015 Camaro (ZL1) started making groaning noises when turning corners. After changing the fluid, and doing the recommended figure eights in a empty parking lot, the noise went away. I probably didn't need to, but I added an additional ounce of Limited Slip Axle Lubricant Additive (10-4003 / 88900330).

I was having issues with the differential making odd sounds on my Corvette. I read that replacing the older diff fluid with newer fluid should help. Most people also suggested using the ACDelco product over other products, particularly Corvette owners. It did take a little time to quiet things down and it was somewhat gradual with usage. I read that you need to get the new fluid worked through the system and that may take doing some slalom runs, faster turns, going in reverse, etc. Also to take it easy for the first 500 miles after changing the fluid, which I did. I am not sure exactly when, but within a couple days I stopped noticing the sounds it was making before changing the fluid. I am happy with the result.

Great quality diff fluid to replace on c6 corvette as it did reduce rear axle noise immediately.

The local dealership wanted $40 a quart for this. Um, no. This is why Amazon wins a lot of my business if I can wait for car parts.

Limited slip additives are already in this oil, so my GM truck's clutch packs for limited slip should be safe. For price & lack of information I deduct one star. Is this product hygroscopic? I have no idea. GM is very ambiguous when it comes to their description of the product. The way GM packages this, I assume products like Redline, or Royal Purple may actually be better. They cost the same or less, and give LS protection. I also only give four stars because this product's price is way up there with racing blends like Royal Purple, Redline, or other high performance racing products. I have no idea what type of synthetic this is. At least Redline tells their customers what they use as a feedstock base for their formulation. Delco, BMW, Volvo, Motorcaft, Mopar, Valvoline all keep it some deep dark secret, so I have no idea what to expect this product to do to certain materials. Just because GM says it is what should be used on GM manual transmissions & rear ends is just not quite good enough. I remember when GM's limited slip was new. My father's 4 speed Positrack dual exhaust 348 6 Pack Offie Impala, went through a clutch pack every 6-8 months.

After changing my gear oil at 5k miles to Mobil 1 gear oil, I started to hear a groan from the rear end while backing up cold and turning. After doing some research, I changed the gear oil to ACDelco Dexron, and my issue was solved.