AHS 1,440 #1 Posted June 3, 2023 It’s my nice (old?) work truck, its hauled many of Wheelhorses during its lifetime!!! It’s got 130k on it. I changed the rear end oil at 75-80k, and this morning. It’s got a limited slip rear end. 3.5 quarts of 75-90 and limited slip additive is what the book calls for. So i changed it with Lucas synthetic 75-90 and the limited slip. Ive got about 20 miles on the rear end since its change… and it chatters around corners. Does it need break in time? 1,000 miles or so? I was kinda worried when i heard it chatter. Now the limited slip additive says to use 1 bottle on rear end up to 4 quarts…and it says not to use anymore! I think im just gonna drive it… its got 3.5 qts of 75-90 plus the limited slip additive. Anyone else have this issue with limited slip rear ends? Share this post Link to post Share on other sites
cleat 5,986 #2 Posted June 3, 2023 My 2002 F150 needed twice the recommended additive to stop the grab and chatter when turning. At that point it drove fine. 1 Share this post Link to post Share on other sites
AHS 1,440 #3 Posted June 3, 2023 5 minutes ago, cleat said: My 2002 F150 needed twice the recommended additive to stop the grab and chatter when turning. At that point it drove fine. Really? Ok, so you CAN put in twice the recommended amount. I was thinking about that. Share this post Link to post Share on other sites
cleat 5,986 #4 Posted June 3, 2023 Well, I figured it might need new clutch packs anyway so I had nothing to lose by trying. I drove it for several years like that and it seemed fine. My new truck has an e-locker so no limited slip to worry about. The limited slip in my 1986 Mustang GT has been trouble free since new. 2 Share this post Link to post Share on other sites
AHS 1,440 #5 Posted June 3, 2023 I put in a second bottle of the limited slip juice… hopefully that fixs it!! Share this post Link to post Share on other sites
OutdoorEnvy 1,522 #6 Posted June 4, 2023 If that doesn't work I would go back to whatever you used the first time you did it and it didn't have this problem. I wouldn't drive it making noise. That's not good. 1 Share this post Link to post Share on other sites
squonk 41,118 #7 Posted June 4, 2023 Drain it out and try non synthetic oil with the additive. 1 Share this post Link to post Share on other sites
AHS 1,440 #8 Posted June 4, 2023 1 hour ago, squonk said: Drain it out and try non synthetic oil with the additive. That’s what the manual say… 80-90 hypoid gear oil. The bottle say hypoid, but synthetic. Regular gears oil is thicker than synthetic, isn’t it? Maybe that’s what the oil girl needs! Share this post Link to post Share on other sites
squonk 41,118 #9 Posted June 4, 2023 (edited) 59 minutes ago, AHS said: That’s what the manual say… 80-90 hypoid gear oil. The bottle say hypoid, but synthetic. Regular gears oil is thicker than synthetic, isn’t it? Maybe that’s what the oil girl needs! Get regular 80/90 non synthetic. https://www.walmart.com/ip/Super-Tech-Gear-Lubricant-SAE-80W-90-1-Quart-Bottle/16913697?from=/search https://www.napaonline.com/en/p/NOL75210?impressionRank=4 Edited June 4, 2023 by squonk Share this post Link to post Share on other sites
AHS 1,440 #10 Posted June 5, 2023 Yukon gear says non synthetic. Guess what im doing tomorrow!! Pray that it isn’t messed up!! Share this post Link to post Share on other sites
