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Axle oil
Jul 22, 2023 17:27:08 GMT -8
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Post by spud on Jul 22, 2023 17:27:08 GMT -8
What is your gear oil of choice for model 20 axles? Is it 75-90? Or heavier? The factory service manual specifies 80w. , if not available then 90w….I havent seen anything like that in decades. I have always used the heavy stuff, 85-140. Maybe i’m making a mistake?
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Post by 69Rebel on Jul 22, 2023 17:50:44 GMT -8
Royal Purple synthetic of course.
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Post by landbarge on Jul 22, 2023 18:00:38 GMT -8
85-140 in my stuff My older son's Jeep has redline heavy shockproof oil because it has an oddball whiney piece of shit aluminum Dana.
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Post by Captain Awesome on Jul 22, 2023 18:09:24 GMT -8
Redline 75W90
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Post by sc397 on Jul 23, 2023 7:03:14 GMT -8
85-140 Valvoline with a tube of Limited Slip additive.
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Post by landbarge on Jul 23, 2023 7:06:35 GMT -8
Mine has an unlimited slip differential so I don't need the additive
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Axle oil
Jul 23, 2023 8:17:42 GMT -8
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Post by spud on Jul 23, 2023 8:17:42 GMT -8
So far one vote for lighter oil, 2 votes for heavy oil and one vote for royal slurple of non specific viscosity.
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Post by landbarge on Jul 23, 2023 8:46:17 GMT -8
The only thing I would say is if you put miles on, then to go synthetic and avoid some parasitic drag
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Axle oil
Jul 23, 2023 9:05:18 GMT -8
via mobile
Post by spud on Jul 23, 2023 9:05:18 GMT -8
Thats kind of my thoughts. The problem with my thoughts is is overthink stuff. I have this old axle assembly. I overthought it some and decided to put new clutches in the twin grip. Which in hindsight was dumb, but it happened. I cleaned some crud out of the housing and greased up the bearings and put it back together. I figure its gotta have limited slip lube for sure, but should i go with the lighter oil? It might be more fuel efficient, but if i do go with light oil and i hear the gears, i will get all discontent and eant to change it for heavy oil, then if i hear the gears i will just be all pissy and slap myself again. It aint easy being a procrastinator. But anyways i got conventional 75-90 limited slip lube and full synthetic 85-140 limited slip oil. Might be a coil toss. I won’t be happy either way. Is it ok to run limited slip lube in a non limited slip rear?
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Post by Captain Awesome on Jul 23, 2023 13:12:33 GMT -8
LS lube fine to use... I like the lighter weight, in any brand really, less drag, rolls along easier. I put that 85-140 shit in my Wheelhorse and in the winter it's an awful drag. You don't have that problem down there, but you can just feel the drag.....
use the Heavy shit if the rear is sloppy, is my view....
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Post by PHAT69AMX on Jul 23, 2023 15:19:36 GMT -8
15-20 years ago, got and used this: For the AMC 20 Twin Grip Rear Differential, from the local Chrysler Jeep Dealership, Got 2 quarts of: Mopar Part # 04874468 80W90 Gear & Axle Lubricant and 4 ounce bottle of Mopar Part # 04318060AB Limited Slip Additive Friction Modifier
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Post by 69Rebel on Jul 23, 2023 17:35:22 GMT -8
FWIW, I changed the rear end grease in my 1 ton Chevy before driving it to Kansas grossly overloaded. I used the cheap 85-140 that comes in the gallon jug with the pump built in. The rear end didn't blow up on the trip.
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Post by Captain Awesome on Jul 23, 2023 19:49:40 GMT -8
I can't tell you how many people I've know who have either towed a car (tow bar or Dolly) with no dif cover on it. Or just forgot to refill after a fluid change and burned it up.
When it comes down to it, Vegetable Oil is better than nothing.
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Post by spud on Jul 24, 2023 1:24:28 GMT -8
I have a story of two sick gaymcers. One bought an axle from the other. The seller told the dumbass the pinion seal leaked and needed fixed. The buyer bought it, installed it, drove it a few miles and destroyed it because it had no oil in it. Then they werent happy anymore. True story. The names were left out to protect the stupid. And no it wasnt me even though i’m stupid😆
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Post by Captain Awesome on Jul 24, 2023 9:08:51 GMT -8
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