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Old 01-20-2011, 03:21 PM   #1
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F&R diff and transmission fluid issues! Over my head!

So I took my 99 TJ in to get the oil changed and i came away a little overwhelmed. We all know that an oil place's first goal is to up sell product, hence the reason why they usually try to tack on new air filters, special oil, coolant flush etc... but the guys at the lube shop were genuinely concerned about the TJ. I have 140 k on it and received it as a temp vehicle after my Land Rover decided to dump it's front and rear diffs. I have been driving it for the better part of two years and have done little in the way of maintenance. Blame it on College budgets or stupidity, but i have put little in besides a new clutch, radiator and belts. As of right now the rear diff is leaking heavily, the front diff is contaminated and the transmission needs a flush. This seems huge to me, b/c my Land Rover was basically totaled b/c of front and rear diffs. Since I just graduated, I have about $0 to put into the TJ, but I'll take out a loan if it means saving my car from doomsday.

How do I organize these issues from fix-now to fix-in-a-bit?

Can I flush the tranny myself? (I have access to a pretty well stocked garage and almost every automotive tool there is)

Can I flush the front diff?

Can I buy a new seal for the rear, and install it myself?

Or is it just better to take it into a shop and pay the price to know that is was done right?

Thanks Everyone.

M

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Old 01-20-2011, 03:27 PM   #2
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Pick up a manual for your Jeep and have a good read. Everything you're describing is fairly easy work wise. When you drain the transmision, drain the transfer case as well. The 5 places that need oil are engine, front and rear diffs, transmission, and transfer case.

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Old 01-20-2011, 03:28 PM   #3
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Given no damage has been done due to leaks or burnt oil, yes you can do all of this yourself super cheap and easy. You just need a few tools, patience and the will to learn

Check out this website under the the maintenance section, google 4x4xplor tj maintenance and all the info you desire will be there

Good luck!
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Old 01-20-2011, 04:04 PM   #4
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Im in the process of doing rear diff and tranny flush. (front was done at dealer before i bought it because it was leaking)

I understand how to do the diff, but how do i drain the fluid from the tranny?
I have found a few sources saying that just pulling the pan wont get all the fluid out.
How do i get all the fluid drained?
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Old 01-20-2011, 04:08 PM   #5
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Thanks Everyone. I am reading up on it now. It's definitely something I can take a stab at.
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Old 01-20-2011, 04:23 PM   #6
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you can do everything you said in a parking lot as long as you have the right tools.
for sealing the diffs, use RTV sealers designed for contacting oil.
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Old 01-20-2011, 04:24 PM   #7
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Quote:
Originally Posted by Mr_RPM View Post
How do i get all the fluid drained?
I assume you have an Auto, you need to flush it to get most of the fluid out.
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Old 01-20-2011, 04:43 PM   #8
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Where is the rear leaking heavily from?
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Old 01-20-2011, 04:44 PM   #9
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The diffs are easy and will cost you a little time and less than $50.
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Old 01-20-2011, 04:52 PM   #10
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yes, i have an auto...can i flush it myself?
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Old 01-20-2011, 05:18 PM   #11
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You cannot flush it yourself the way a shop would if they have a trans flush machine but you can drop the pan, drill and tap a small hole it will have to be pipe threads and install a plug, change the filter and gasket re-install it add about 4 qts of trans fluid and check it. drive it a few days and drain some more out do that till you have gone through the 12qts that will be in a case. That will have flushed all the fluid out for you and you will have a clean filter. With that many miles you need a new filter for sure. You needed one a long time ago.

As far as the front and rear diff they are easy just pop the covers clean them with break fluid and re-install the covers. I prefer RTV over a new gasket and its one less thing to buy. This its where it gets tricky though, if you are changing your pinion seals you need to pack lube behind the seal in it to keep that little spring from popping out when you install it and lube the seal. and when you put your yoke and nut back on do not tighten the nut to much or you will lock up your diff. There is a crush collar in there on the pinion and it cannot be un-crushed so what your looking to do is to tighten it up the exact amout that it was b4 maybe a little more, this is a by feel opperation better done with both tires in the air. Well I hope that helps you out.

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Old 01-20-2011, 05:48 PM   #12
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im way over due at 66k miles?
yeah ill just have the shop do it with a machine...
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Old 01-20-2011, 07:13 PM   #13
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Look around the net, a good site is Stu Olson's (stu-offroad.com) they have good write-ups, easy to read/follow and pictures! The diff's and transfer case are easy, I have a 5 spd, it's also easy.

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