Jeep Garage  - Jeep Forum banner

Rear Differential Fluid Change

37K views 27 replies 16 participants last post by  Walt 
#1 ·
Well, I had some time today to change my rear differential fliud with some Mobil One fluid. I was going to do the front one too but I needed a 14mm allen wrench did not have one will get this done this weekend. So I watched the youtube video on how to do this it was pretty easy but the clean up was not. I pumped out 2 quarts of the old fluid it was black looking. This was the first time I did this myself. I had the dealership do it about 15,000 mile ago I think I paid for something. it was alot easier than I thought. I put in 2 quarts with 4 oz modifier stuff I hope that will do it. Here is a picture of what I pumped out.
 

Attachments

See less See more
1
#3 ·
hhhhhhhhhhmmmmmmmmmm really
 
#5 ·
I heard the same thing, some of the old oil keeps the gears lubricated and it's dirty contents are minimal compared to the amount of new fluids you put in.
 
#7 ·
Ace Hardware has a U.S.-made 14mm Allen key for ~$10. Works just right in the available space.
Front is easier than the rear because it has a drain plug and a fill plug. Take fill plug out FIRST, then the drain plug.
 
#8 ·
Here is a picture of mine in the shop last Saturday taking a piss.

 
#12 · (Edited)
FWIW - it's not the brake cleaner itself that causes the problems per se; it's the fact that you're drying out all the lubricated parts when the brake cleaner is wiped off and/or evaporates. When you fill it back up, it takes a little while for the gear oil to work its way into all the nooks and crannies; meanwhile, the bearings, gears, et cetera are running metal on metal. Not good.

Also, the Redline 75W140 works great and already has the limited slip modifier in it.

Also, also, harborfreight.com has a vast array a specialty tools. Got all of my one-off allen wrench sockets and what-not delivered to my door. Got the whole set of hexes for less than $20.

http://www.harborfreight.com/9-piece-38-and-12-drive-metric-hex-bit-socket-set-67880-html.html
 
#14 ·
FWIW - it's not the brake cleaner itself that causes the problems per se; it's the fact that you're drying out all the lubricated parts when the brake cleaner is wiped off and/or evaporates. When you fill it back up, it takes a little while for the gear oil to work its way into all the nooks and crannies; meanwhile, the bearings, gears, et cetera are running metal on metal. Not good.

Also, the Redline 75W140 works great and already has the limited slip modifier in it.

Also, also, harborfreight.com has a vast array a specialty tools. Got all of my one-off allen wrench sockets and what-not delivered to my door. Got the whole set of hexes for less than $20.

http://www.harborfreight.com/9-piece-38-and-12-drive-metric-hex-bit-socket-set-67880-html.html
I got that set at habor freight but the area is too tight to fit the socket to the wrench I can use it to take off the drain plugs on the front and transfer case.
I was reading that the 2005 WK manuel had ATF+4 fluid to use in all transfer case. But that is wrong, I am thinking that when my dealership did this the first time I think they put in the Transmission ATF 4 fluid in my transfer case. I was looking at my old ticket and it had Gear lube 2qty Lubricant gear 5qty and fluid auto tran 3 qty. I will find out if they put the wrong stuff in my transfer case saturday morning. I hope not. I will let you guys know.

Later
 
#13 ·
^^^^^^ +1
 
#16 ·
Well, I worked on the TRANSFER CASE, A big pain in my ass, I had zero problem draining out the fluid which look very clean looking, Wish I did not change it. So I go to fill it up and I put about 1 quart and about 8 ozfrom the second bottle in and it starts coming out the the fill plug so I stopped. How the heck am I going to get it to fill up if it keeps coming out??? It also looks like I will have to buy a another quart so that is full.
 
#18 ·
...I worked on the TRANSFER CASE....the fluid ... looked very clean... So I go to fill it up and I put about 1 quart and about 8 ozfrom the second bottle in and it starts coming out the the fill plug so I stopped. How the heck am I going to get it to fill up if it keeps coming out??? It also looks like I will have to buy a another quart so that is full.
Check it again tomorrow. If it needs more MOPAR NV245/247 TRANSFER CASE Fluid, you can add some. Maybe park slightly down hill in your driveway if you are anal (like me).

I have read that, sometimes, not all of the transfer case oil drains out, so the full measure may not go back in. On the positive side, you stated that it looked very clean, so it's probably not an issue if 3/4 of the total volume is new with fresh additives...:)
 
#17 ·
Don't know which T-case you have, but normally you fill it up until it overflows with the car level. When it starts to overflow, you know that the level is ok.
 
#22 ·
Well I finished up the transfer case and front diff today, I cheated and took it up the road to the place that did my brakes Lee Auto Care. I was just a pint short in the transfer case and I had them do the front diff to for a total cost $15 bucks. I think if my jeep was not lowered and had the srt bumpers side skirts I think I could have done it myself oh well. I will say if you do it yourself put a 90 degree elbow on the end of the pump hose and rest it on the diff hole and shoot it in that make alot easier job to put in the fluid. The guy doing put the fluid in a pump sprayer pumped it right in it had a 90 on the end of the sprayer.

So I think am good on all my mainteince stuff on my jeep for now. By now I am selling my car letting someone else do all the fluids spark plugs and what not, but I will have this jeep for years to come so I got to keep it running.
Thanks guys for all the help this thread should help other fluid changing guys too.

Chris
 
#25 ·
75-140 gear oil, I used Mobil 1. I doubt you need any additives, but I would just call a dealer and give them your vin and they can tell you.
 
#28 ·
No. Only QD-II needs the friction modifier added.

I used Mobil-1 75W-140 twice so far (36K and 72K miles) and no issues.
 
This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.
Top