Dumped the diff at 6,500 miles. Next will likely be around 50-60k.
You are just being logical again.... Ha!Nice ride. I've always admired the GS cars.
My personal opinion is that nothing changed after your fluid drain and fill. That said, I always "notice" something different too, myself. So it's not just you.
Hey man, even if it is placebo, don't deny yourself the enjoyment of a buttery smooth drivetrain.You are just being logical again.... Ha!
I serviced our '01 Tundra a couple of weeks ago; it also seemed to smooth out the drivetrain a little.
Normally I would just wait until 10k to change the oil, but yes, if I just spent that kind of money on that beautiful monster I admit, I would do it too. So you're towing a 5000 trailer which will put you in the "Towing and severe service" category for maintenance and rear diff oil weight, probably push your gear oil weight up to maybe 7W-140 weight gear oil. Look in your owners manual for fluids and capacities and look at the severe service column.Just joined today while learning about differential oils. Been learning here and online today.
Purchased a 2022 2WD SR5 Tundra for towing a 5000 pound trailer and going to replace rear differential oil at 1000 miles. It has a limited slip differential and required oil is Toyota LT 75W85 GL5 or equivalent. Redline states their 75W90 GL5 is compatible and a replacement for "Toyota/Lexus Gear Oil LT/LX" oils. Before replacing the differential oil, wanted to gain input on an equivalent replacement differential oil.
Thanks,
Just scored 4 more quarts of Delvac 1 for $47 on eBay … 6 is enough to do the front Dana and GM rear …2020 JLU Rubicon - annual lubricant change (rear axle only)
Out: Delo ESI 80W90
In: Delvac 1 75W90
View attachment 122475
Owned GM LT’s & SUV’s since 1985 … never used the grape stuff - Delvac 1 mostly … but Valvoline conventional is good lube - just can’t run 100k etc … 30k changes should be no sweat … use a clear straw to sample periodically if concerned …'88 Chevy K1500; with high-mileage but somewhat newer '92 K2500 9.5" rear axle with G80 Gov-Lock that I swapped-in.
Initial change was with Amsoil Severe Gear 75W-90. Gov-Lock quit working soon afterwards. Wouldn't engage--acted like an open differnetial just like the previous axle. Dropped the axle cover, expected to see chunks 'n' pieces in the bottom of the housing. No. Looked terrific inside.
Second change was with Valvoline 80W-90 non-synthetic, having no limited-slip additive blended-in by Valvoline or by me. Label says "for top-off only of positraction differentials". (i.e., there's no friction modifier in this stuff, it shouldn't be a full-fill for a posi differential.) Gov-Lock still didn't work. Dropped cover, still looked beautiful inside. All the G80 pieces seemed to be in order and functional.
Third change again with the same Valvoline 80W-90 non-synthetic, no limited-slip additive. Gov-Lock seems to be working again, at least partially if not fully.
Good luck figuring out which "Genuine GM" axle lube to use in an older Gov-Lock. All the GM part numbers have been superseded at least once if not more. GM has a bulletin on Gov-Lock axle lubes that's poorly-written (ambiguous) and suggests a lube part number that doesn't exist any more. The best I can tell, the "correct" lube has a "grape juice" scent; and might be ACDelco 10-4016. Depending on which web-site I check, there's a warning that that fluid is for Camaros and NOT FOR TRUCKS. Go figure. I'm sticking with the cheap Valvoline conventional, ZERO-friction-modifier stuff until proven different.
I'll use the same Valvoline when I finally get around to poking a TrueTrac into the '97 K2500 in a few days.