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Unread 02-12-2007, 10:39 AM   #1
blueknight44
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99 manual transmission gear oil

The owners manual calls for 75w-90 api-gl5 gear oil for a manual trans

The rear end calls for 80w-90 gear oil

can 80w-90 gear oil be used in the manual trans without problems?

tia

This's my first Manual trans

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Unread 02-12-2007, 10:42 AM   #2
SecondTJ
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80w90 can be used without issue.

It just depends on GL3/4, GL5

Do you have the AX-5 or AX-15?
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Unread 02-12-2007, 11:31 AM   #3
1BadJeepX06
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80w90 is fine. That is really a universaly application when it comes to differentials and manual trannies..

DH
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Unread 02-12-2007, 11:57 AM   #4
99TJMark
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A '99 with 5 speed manual should have the AX-15. Use NO GL5 lubricants in it. The GL-5 additives eat up yellow metals which is what your synchros are made of. If you have an AX-15 you should be using Redline MTL or MT-90 which are GL 3 and GL4 compatible. Daimler Chrysler printed the owners manual in error when it said GL5 was used in the AX-15.
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Unread 02-12-2007, 01:14 PM   #5
blueknight44
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Quote:
Originally Posted by 99TJMark
A '99 with 5 speed manual should have the AX-15. Use NO GL5 lubricants in it. The GL-5 additives eat up yellow metals which is what your synchros are made of. If you have an AX-15 you should be using Redline MTL or MT-90 which are GL 3 and GL4 compatible. Daimler Chrysler printed the owners manual in error when it said GL5 was used in the AX-15.
Hi Mark,

I'm AL, you saved the day!

You're 100% correct that the owners manual is incorrect.

I have a tech support company I called to ask for a review of my vehicle's manual.

Here's what they said.

1999 2.5L w 5 speed manual trans has a AX-5 trans that uses GL-3, 75W-90

with the drain plug at the bottom center of the trans, or 6 o'clock low.

The drain plug is a 24MM.

Also the GL-3 is a dealer part or redline gear oil that you use is compatable.

The AX-5 was for the 2.5L engine.

The AX-15 was for the 4.0L engine.

Thanks for the information that will help other 1999 TJ 2.5L AX-5 trans owners.
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Unread 02-12-2007, 01:55 PM   #6
SecondTJ
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Quote:
Originally Posted by 99TJMark
A '99 with 5 speed manual should have the AX-15.
That depends on what engine is in it.
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Unread 02-12-2007, 02:35 PM   #7
99TJMark
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Quote:
Originally Posted by SecondTJ
That depends on what engine is in it.
I made a guess on the AX-15 because he has no info in his profile or in his sig. Either way AX-5 or AX-15 they are both Jap transmissions and both are sensitive to the GL-5 additives. As a matter of fact I checked the '99 FSM and the oil requirements are the same for both.

From the '99 FSM

Recommended lubricant for AX5 transmissions is
Mopar 75W–90, API Grade GL–3 gear lubricant, or
equivalent.
Correct lubricant level is from the bottom edge, to
no more than 6 mm (1/4 in.) below the bottom edge of
the fill plug hole.

Recommended lubricant for AX15 transmissions is
Mopar 75W–90, API Grade GL–3 gear lubricant, or
equivalent.
Correct lubricant level is from the bottom edge, to
no more than 6 mm (1/4 in.) below the bottom edge of
the fill plug hole.
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Unread 02-12-2007, 02:57 PM   #8
blueknight44
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Thanks to all for your replies,

The eye catching comment made about the AX-5 man trans is that it's a "light duty" trans.

I would say my 2.5L engine, with a AX-5 5 speed manual trans shouldn't be called upon to keep up the big boys on some advanced rated trails.

Where can I buy 75W-90 gl-3 gear oil other than the dealer?



I'll update my profile soon.

Tia, AL
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Unread 02-12-2007, 03:00 PM   #9
daveg13
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Quote:
Originally Posted by blueknight44
Where can I buy 75W-90 gl-3 gear oil other than the dealer?
I get my Redline here: www.myoilshop.com and I believe summit also carries it.
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Unread 02-12-2007, 08:04 PM   #10
James04TJ
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Quote:
Originally Posted by blueknight44
Where can I buy 75W-90 gl-3 gear oil other than the dealer?
GL-4 is fine... Redline MT-90 and AMSOIL MTG are commonly available. Motul and Torco also make good GL-4 tranny gear oils but are much harder to find unless you have a GOOD import tuner in your area.
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Unread 02-12-2007, 11:14 PM   #11
Kiwi_TJ
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AX-5 or AX-15 ?

Hi There,

I too am looking at replacing my manual transmission fluid. Is there any way to tell which transmission I have. Do they look different, or have a code tag anywhere?

I have a 1997 TJ Sport with the 4.0 Engine.

Bye for now,
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Unread 02-12-2007, 11:16 PM   #12
SecondTJ
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Quote:
Originally Posted by Kiwi_TJ
I too am looking at replacing my manual transmission fluid. Is there any way to tell which transmission I have.

I have a 1997 TJ Sport with the 4.0 Engine.
You have the AX-15
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Unread 02-13-2007, 09:05 PM   #13
blueknight44
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Dealer said 10w-30 replaces 75w-90

Quote:
Originally Posted by 99TJMark
A '99 with 5 speed manual should have the AX-15. Use NO GL5 lubricants in it. The GL-5 additives eat up yellow metals which is what your synchros are made of. If you have an AX-15 you should be using Redline MTL or MT-90 which are GL 3 and GL4 compatible. Daimler Chrysler printed the owners manual in error when it said GL5 was used in the AX-15.

My parts house called a local Jeep dealer to verify the AX-5 gear lube

The Redline MT-90 was the only gear oil my parts house could find to be 75W-90 GL-3 for my AX-5 trans.

My parts house had a Jeep dealer fax them that 10w-30 motor oil is recommended to replace 75w-90 gear oil for the AX-5 Jeep trans.

I have the fax with the dealer parts numbers.

How can anyone believe a 10w- 30 motor oil can replace
a 75w- 90 to lube the AX-5 trans?

So if anyone believes this, 10w-30 should be used in differentials
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Unread 02-13-2007, 11:07 PM   #14
SecondTJ
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75w90 gear oil is similar to a 10w40 motor oil in weight.

but, they don't have the same properties and additives.
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Unread 02-13-2007, 11:58 PM   #15
blueknight44
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Quote:
Originally Posted by SecondTJ
75w90 gear oil is similar to a 10w40 motor oil in weight.

but, they don't have the same properties and additives.
Thanks for your knowledge, I deserve the empty feeling I now have, I just didn't think that 10w-40 motor oil could be like 75w-90.

I was just trying to understand what I was using in my vehicle, and I got buried in a industry of options way over my head.

I should've found Reline MT-90, bought it,installed it, and shut up.

Well now I have knowledge of manual trans oil.

Now I understand I have a light duty manual trans AX-5, that if I stay with stock equipment, tires and don't beat it I should continue owning a fun trail Jeep.

Thanks to all who answered this thread.
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