What gear Oil to Use?
03-23-2014, 07:42 PM
#1
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Year: 1999
Model: Cherokee
Engine: Stright 6
What gear Oil to Use?
Attempting to decide what gear oil to use, info from my build sheet.
Dana M30/181MM Front Axle
Corporate 8.25 Rear Axle
3.55 Rear Axle Ratio
Now the manual says 75W-90 but then goes on to talk about class 3 hitch, which I have but is not on the build sheet so I assume it was added.
The manual says tow package should use 75W-140 synthetic oil with tow package and models with Tack-lock should use an additive.
No track lock on the build sheet but since a hitch is there should I use 75W-140 sny, or 75-90?
Dana M30/181MM Front Axle
Corporate 8.25 Rear Axle
3.55 Rear Axle Ratio
Now the manual says 75W-90 but then goes on to talk about class 3 hitch, which I have but is not on the build sheet so I assume it was added.
The manual says tow package should use 75W-140 synthetic oil with tow package and models with Tack-lock should use an additive.
No track lock on the build sheet but since a hitch is there should I use 75W-140 sny, or 75-90?
03-23-2014, 08:09 PM
#3
Herp Derp Jerp
Join Date: Nov 2011
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
^^
75w90 synthetic is the best stuff for a normal street Jeep. Not as thick as 80w90 dino juice so you get a little better fuel economy (a lot of people report significant improvements in winter with syn gear oil).
If you take your Jeep swimming though 80w90 is a lot cheaper. It should be changed every time the axle is submerged as water WILL leak in.
If you're doing a lot of towing, say >2k lbs on a regular basis, or go off road a lot 75w140 in the rear will provide the best protection. You should still run 75w90 in the front.
TrackLock is Chrysler's Limited Slip Differential. There are a few ways to check for it, one of which is jacking up the rear and and seeing which way the wheels spin (opposite directions is open, same is LSD), one is popping open the diff and looking, one is the sticker which some models have in the glove box, and another might be your factory build sheet.
Limited slips require a friction modifier that can be purchased separately at most stores (including the dealership), but is already added in most synthetic GL-5 gear oils.
75w90 synthetic is the best stuff for a normal street Jeep. Not as thick as 80w90 dino juice so you get a little better fuel economy (a lot of people report significant improvements in winter with syn gear oil).
If you take your Jeep swimming though 80w90 is a lot cheaper. It should be changed every time the axle is submerged as water WILL leak in.
If you're doing a lot of towing, say >2k lbs on a regular basis, or go off road a lot 75w140 in the rear will provide the best protection. You should still run 75w90 in the front.
TrackLock is Chrysler's Limited Slip Differential. There are a few ways to check for it, one of which is jacking up the rear and and seeing which way the wheels spin (opposite directions is open, same is LSD), one is popping open the diff and looking, one is the sticker which some models have in the glove box, and another might be your factory build sheet.
Limited slips require a friction modifier that can be purchased separately at most stores (including the dealership), but is already added in most synthetic GL-5 gear oils.
03-23-2014, 09:08 PM
#5
I have the same axles as you and just changed mine this weekend. I used Valvoline synthetic 75/140 in the front and rear. It's a little more expensive than 80/90 but I think it's worth the extra protection. I picked it up at AutoZone for $12.99 qt. Walmart has their house brand synthetic for about $11.00 qt also if you wanna save a couple bucks.
03-24-2014, 12:56 PM
#6
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Year: 1999
Model: Cherokee
Engine: 4.0
^^
75w90 synthetic is the best stuff for a normal street Jeep. Not as thick as 80w90 dino juice so you get a little better fuel economy (a lot of people report significant improvements in winter with syn gear oil).
If you take your Jeep swimming though 80w90 is a lot cheaper. It should be changed every time the axle is submerged as water WILL leak in.
If you're doing a lot of towing, say >2k lbs on a regular basis, or go off road a lot 75w140 in the rear will provide the best protection. You should still run 75w90 in the front.
TrackLock is Chrysler's Limited Slip Differential. There are a few ways to check for it, one of which is jacking up the rear and and seeing which way the wheels spin (opposite directions is open, same is LSD), one is popping open the diff and looking, one is the sticker which some models have in the glove box, and another might be your factory build sheet.
Limited slips require a friction modifier that can be purchased separately at most stores (including the dealership), but is already added in most synthetic GL-5 gear oils.
75w90 synthetic is the best stuff for a normal street Jeep. Not as thick as 80w90 dino juice so you get a little better fuel economy (a lot of people report significant improvements in winter with syn gear oil).
If you take your Jeep swimming though 80w90 is a lot cheaper. It should be changed every time the axle is submerged as water WILL leak in.
If you're doing a lot of towing, say >2k lbs on a regular basis, or go off road a lot 75w140 in the rear will provide the best protection. You should still run 75w90 in the front.
TrackLock is Chrysler's Limited Slip Differential. There are a few ways to check for it, one of which is jacking up the rear and and seeing which way the wheels spin (opposite directions is open, same is LSD), one is popping open the diff and looking, one is the sticker which some models have in the glove box, and another might be your factory build sheet.
Limited slips require a friction modifier that can be purchased separately at most stores (including the dealership), but is already added in most synthetic GL-5 gear oils.
I wait till a sale comes up on gear lube usually for dealers I know and buy a 5 gal bucket at a time, a lot cheaper in the long run. I do have aftermarket differential covers (HD Cast Aluminum) front and rear that have a drain hole at the very bottom of the cover. It drains very well and if I see or feel any metal on the bottom of the housing the cover comes off for inspection.
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03-24-2014, 08:31 PM
#9
Herp Derp Jerp
Join Date: Nov 2011
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Year: 1999
Model: Cherokee
Engine: 4.0L OBD-II
Yeah several companies use "Corporate" to describe their own axles internally, to differentiate those purchased elsewhere, usually Dana Corporation. GM calls one of theirs a "Corporate 14-bolt"
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