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Old 10-21-2012, 09:28 AM   #1
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fluids for a 1999 TJ

Looking to change the tranny and diff. fluid in my jeep.

I would prefer to use synthetic, as its cold here in the winter, but I didnt get a owners manuel.

What Grade of oils do I need

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Old 10-21-2012, 09:50 AM   #2
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Not sure what tans and such you have, but this is all the information from another forum

Transmission:

30RH 3 speed auto - ATF+4 (ATF+3 originally recommended; ATF+4 is replacement) For number of quarts, see post #2 below
32RH 3 speed auto - Approximately 4 quarts ATF+4 (ATF+3 originally recommended; ATF+4 is replacement) when drained via dropping the pan / Approximately 8 quarts dry fill (see post #2 below for fill procedure per the FSM)
42RLE 4 speed auto - Approximately 4 quarts ATF+4 when drained via dropping the pan / Approximately 8.8 quarts dry fill

AX-5 5 speed manual - 3.3 quarts 75W-90 GL3, 75W-90 GL4, or 10W30 (NOT GL5 or GL5 compatible as incorrectly stated in some of the manuals)
AX-15 5 speed manual - 3.32 quarts 75W-90 GL3, 75W-90 GL4, or 10W30 (NOT GL5 or GL5 compatible as incorrectly stated in some of the manuals)
NV3550 5 speed manual - 2.1 quarts Mopar fluid part # 04874464AA or Synchromax (meets Mopar MS-9224 specs)
NV1500 5 speed manual - 2.4 quarts Mopar part # 04874464AA or Synchromax (meets Mopar MS-9224 specs)
NSG370 6 speed manual - 1.58 quarts Mopar part # 04874464AA or Synchromax (meets Mopar MS-9224 specs)

Transfer Case:

231 - 1.1 quarts ATF+3 or ATF +4
241 - 2.1 quarts ATF+4

Axles:

Dana 30 - 1.25 quarts 80W-90
Dana 35 - 1.75 quarts 80W-90 or 75W-140 *
Dana 44 - 2 quarts 80W-90 or 75W-140 *
Rubicon Dana 44 (FRONT) - 1.375 quarts 75W-140 synthetic
Rubicon Dana 44 (REAR) - 2 quarts 75W-140 synthetic **

*4 oz of friction modifier is required with Trac-Lok limited slip differential.
**Friction modifier is NOT required with Tru-Lok locker/limited slip differential (factory Rubicon locker).

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Old 10-21-2012, 04:19 PM   #3
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any way to see what tranny and transfer case I have?

The tranny is a 5-speed manual.
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Old 10-21-2012, 04:29 PM   #4
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Quote:
Originally Posted by matt88-8
any way to see what tranny and transfer case I have?

The tranny is a 5-speed manual.
Ax5 if the 4cyl ax15 if the 6cyl
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Old 10-21-2012, 04:29 PM   #5
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Quote:
Originally Posted by matt88-8 View Post
any way to see what tranny and transfer case I have?

The tranny is a 5-speed manual.

ax-15 for 1999

and
231
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Old 10-27-2012, 04:38 PM   #6
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thanks all for the info, Who would have guessed 10w30 would work in the tranny?

Also, do you guys suggest full synthetic??
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Old 10-27-2012, 07:18 PM   #7
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For the trans I would
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Old 12-04-2012, 09:02 PM   #8
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sorry for the late update. Just wondering what you use to remove the filler cap on the tranny? didn't seem to have anything that fit...??
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Old 12-04-2012, 09:16 PM   #9
Knows a couple things...

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Filler cap? There is a metric size drain bolt on the passenger side-front & metric size fill bolt mid-way up on the driver's side of the transmission, 10mm IIRC.

A synthetic 10W-30 engine oil is suitable for your transmission, though there are more desirable gear lubes like Redline MT-90 available from www.summitracing.com that I'd rather use.
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Old 12-04-2012, 09:16 PM   #10
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I believe it's 24mm
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Old 12-04-2012, 09:32 PM   #11
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Jerry what would be the best gear oil to use in the AX transmissions? I trust your opinion over most. Looking for best longevity and still great performance. My TJ is my DD.
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Old 12-05-2012, 07:24 AM   #12
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This
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Originally Posted by Jerry Bransford View Post
~~snip~~

A synthetic 10W-30 engine oil is suitable for your transmission, though there are more desirable gear lubes like Redline MT-90 available from www.summitracing.com that I'd rather use.
I use Redline MT-90 in mine and it made shifting smoother.

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