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Old 10-08-2010, 05:56 PM   #1
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Transmission fluid for a 1998?

I'm having trouble finding the tranny fluid I need to use for my Jeep. Its a 1998 manual. The fluid in there right now is a brownish color and I need to add a little because its low. I want to be sure I'm using the right fluid! Thanks!

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Old 10-08-2010, 07:12 PM   #2
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Redline is always popular (about 11 bucks a qt)

I personally use AMSoil (about 13 a qt)

Oh, and its 75w90 btw

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Old 10-08-2010, 08:50 PM   #3
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Royal purple is a good choice also.
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Old 10-08-2010, 09:12 PM   #4
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Redline MT-90 or the Royal Purple equivalent. But if it's low it has to be leaking somewhere. Drain the oil, fix the leak and be done with it, otherwise your spending money you don't need to.
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Old 10-09-2010, 07:32 AM   #5
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here is a link to the service manual page with the transmission fluid type and capacity. The information you are looking for is in the bottom right corner of the first page.

1999 Jeep TJ Wrangler Service Manual - 21. Transmission and Transfer Case
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Old 10-09-2010, 09:51 AM   #6
Knows a couple things...

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Quote:
Originally Posted by greene91 View Post
here is a link to the service manual page with the transmission fluid type and capacity. The information you are looking for is in the bottom right corner of the first page.

1999 Jeep TJ Wrangler Service Manual - 21. Transmission and Transfer Case
The information there showing a 75W-90 GL-3 gear lube is correct. To that can be added 75W-90 GL-4 with the latest factory recommendation being a synthetic 10W-30 engine oil. Redline's MT-90 is a 75W-90 GL-4 which is just a better version of GL-3. A GL-5 75W-90 gear lube is NOT however an improved version of either and is not suitable for use in the AX-5 or AX-15 transmissions. There are a few synthetic GL-5 75W-90 that are ok for use but you have to read the label to make sure of that. If the synthetic GL-5 75W-90 indicates it is safe for "yellow" metals which includes brass which is what the transmission's synchronizers are made from, it is safe for use in the AX-5 and AX-15 transmission used through 1999.

Synthetic 10W-30 engine oil, which is roughly the same viscosity as a 75W-90 gear lube, was added to make it easier to find on the store shelves since GL-3 and GL-4 gear lubes are not stocked by many auto parts dealers.
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Old 10-09-2010, 12:55 PM   #7
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Thanks for your answers! They were helpful. It does have a slow leak on the rear seal where it meets the transfer case. I do plan on fixing it, well, my husband does, but for now I need to keep it full. Thanks for your help!
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Old 10-09-2010, 02:08 PM   #8
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If your going to replace that seal, then refer to this post cause it is probably the job you are talking about and it has a full explanation of the work......

http://www.wranglerforum.com/f5/98-t...eak-56654.html

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