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2004 TJ 4.0L maintenance questions..

6K views 52 replies 12 participants last post by  WideTire 
#1 ·
Hey Guys,

I am planning to do a 60K service myself and want to change all recommended fluids. I found a free service manual for a 2005 TJ so my first question is, how different are the 2004 and 2005 TJs from a service manual perspective ?

I already did the oil change:
10w-30 - 6 quarts
wix filter

I am planing to do following fluid changes:
front axle fluid: 80w-90 1.8L
rear axle fluid: 80w-90 1.8L
transfer case fluid: ATF +4 (but don't know whether its a NV231 or NV241 TC)
Manual transmission fluid: ATF +4 (1.5L)

The above fluids are recommended in the service manual but wanted to check what do you guys use ?

Lubrication:
- steering linkage tie rod ends
- suspension ball joints

What fluids do you guys use for lubrication?

Thanks in advance.
 
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#2 ·
Go to jeepslimited.com, sign up for access and then you can download the fsm for free. If you have a rubicon then you have the 241. I use lucas in my differentials 80w 90, but I use their heavier weight oil in the front because I have an auto locker in the D30. Also make sure you have a limited slip rear differential or not. If you do you'll need a friction modifier in it too. And atf +4 in my auto transmission.
 
#11 ·
Don't forget coolant system, and brake fluid. Often neglected but still important to replace from time to time. (Which I need to do both)....

I'm a fan of the reusable gaskets (Lube locker) just for the fact you don't have to scrape and clean the RTV every time.
 
#24 ·
So I got the build sheet from jeep Chrysler and it only says that front axle is a 30 and rear is 35. It does not say whether its a slip diff or not.

I think I will check the number on my rear diff, if it contains a "L" in it then I guess its a slip, no?
 
#25 ·
So I got the build sheet from jeep Chrysler and it only says that front axle is a 30 and rear is 35. It does not say whether its a slip diff or not. I think I will check the number on my rear diff, if it contains a "L" in it then I guess its a slip, no?
Mine had a tag hanging from the D35 cover saying to add a friction modifier. You can also jack both rear tires off the ground and spin one in neutral. If both tires spin in the same direction, you have the limited slip diff.

Auto part
 
#37 ·
Yes if you have a clutch type that is still functional.

If you jack up one rear tire and adequate Blocks on front tires to prevent rolling. Then put transfer case in neutral and release park brake ( note it will roll unless you are very level or blocked front tires)
Now just hand rotate the jacked up back rear tire and if you can easily hand turn you either don't have a clutch type limited slip or the one you have has no effect anymore and is just like an open Diffy.

With a working clutch type rear wheel will be very hard to hand turn then if you turn hard enough to break clutch LSD free it will continue to turn much easier until you stop turning wheel the clutch engages and again very hard to turn
 
#38 ·
Yes if you have a clutch type that is still functional.

If you jack up one rear tire and adequate Blocks on front tires to prevent rolling. Then put transfer case in neutral and release park brake ( note it will roll unless you are very level or blocked front tires)
Now just hand rotate the jacked up back rear tire and if you can easily hand turn you either don't have a clutch type limited slip or the one you have has no effect anymore and is just like an open Diffy.

With a working clutch type rear wheel will be very hard to hand turn then if you turn hard enough to break clutch LSD free it will continue to turn much easier until you stop turning wheel the clutch engages and again very hard to turn
Ah OK so I guess the same thing applies for the front diff as well correct?

I have one more question, I was talking to rep at O'Reilly parts and he told me that if you don't know whether you have a LSD or not then it's better to add LSD additive to be safe. As per him, it OK to use LSD additive in open diff rather than not adding it in a LSD diff. Is it correct?

Also I have lockers in my front diff, so in that case do I have to add the LSD additive?

Thanks so much for your help.
 
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