Dumb Question?

[KANTANKRUS]

How do I add gear oil in an AX15?

And at what weight?

 

Please advise!

[jeeptec1]

80w 90 is factory fill you can substitute 75w-90 for easier cold weather shifting. There is a fill plug on the side of the trans. I believe it’s a 15/16 plug. Get one of those hand pumps that screw onto the bottle.


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[87MJTIM]

The fill plug is on the passenger's side up high.  The drain plug is on the driver's side down low.

 

A wise man once said to loosen the fill plug BEFORE draining in the gear oil.  If you drain it first, and cannot remove the fill plug, you're screwed.  (Yes, you can fill it from the top shift tower, but that is a lot of work to get to.)

[Dzimm]

Definitely remove the fill plug first, I had a t-case with an immovable fill plug.  That woulda sucked had I not checked it first.

 

I used Redline MT90 in mine.  Expensive but definitely felt better with new fluid. 

 

IIRC there is something to avoid do to the brass synchros, can someone comment on that at all?

[Eagle]

14 minutes ago, Dzimm said:

IIRC there is something to avoid do to the brass synchros, can someone comment on that at all?

 

Yes. The original factory spec for gear lube in the AX-15 was 75W90 GL3. However, GL3 no longer exists. It's now GL5, and GL5-grade gear oils contain more sulpher-bearing additives than GL3. The synchronizers are brass, and the sulpher in GL5 eats up the brass. The factory revised the spec to 30 weight motor oil.

 

A couple of the good synthetic gear oils don't contain sulpher and don't attack the synchronizers. Those are the best choice, but they're expensive and you probably won't find them at the corner auto marts emporium.

[Dzimm]

6 minutes ago, Eagle said:

 

Yes. The original factory spec for gear lube in the AX-15 was 75W90 GL3. However, GL3 no longer exists. It's now GL5, and GL5-grade gear oils contain more sulpher-bearing additives than GL3. The synchronizers are brass, and the sulpher in GL5 eats up the brass. The factory revised the spec to 30 weight motor oil.

 

A couple of the good synthetic gear oils don't contain sulpher and don't attack the synchronizers. Those are the best choice, but they're expensive and you probably won't find them at the corner auto marts emporium.

Ahh yes.  Thanks Eagle!  That's why I chose MT90, easiest to identify/obtain of the acceptable gear oil. 

[KANTANKRUS]

My AX15 is full. Funny thing, I had that transmission, fully rebuilt, so why is it seeping? 

 

Another question?

Somewhere, I thought that I read, that the power steering pump, interacts with the manual transmission slave cylinder. Is that true?

[yxmj]

1) Maybe it was filled using  the shift tower method and they added too much fluid....now the excess is bleeding off..

 

2) NO.....

[Eagle]

3 hours ago, RestoringNV said:

My AX15 is full. Funny thing, I had that transmission, fully rebuilt, so why is it seeping? 

 

Another question?

Somewhere, I thought that I read, that the power steering pump, interacts with the manual transmission slave cylinder. Is that true?

 

No.

 

There is no slave cylinder for the manual transmission. Perhaps you mean the clutch slave cylinder (which only applies to vehicles with a manual transmission).

[omega_rugal]

8 hours ago, RestoringNV said:

that the power steering pump, interacts with the manual transmission slave cylinder. Is that true?

 

no, why would they?

[yxmj]

I had a Jeep like that once.....Every time I turned left it shifted into second. 

[KANTANKRUS]

6 hours ago, Eagle said:

 

No.

 

There is no slave cylinder for the manual transmission. Perhaps you mean the clutch slave cylinder (which only applies to vehicles with a manual transmission).

Yes, that was what I was referring too. I was at work when I posed that question and I hardly get a spare second, let alone a minute to post a question.

[KANTANKRUS]

Mine is external, so I will see if it needs fluid.

[PIKE]

X2 on the Red Line

 

MTL or MT90

[JMO413]

X3 on redline! It made my BA10 5 shift so much better. Can't imagine how good an AX-15 would be.

[phatton]

My shop manual says the recommended gear  oil for the ax15 trans is 75w90 gl-5.  The tranny holds about 3.5 quarts.

[Eagle]

1 hour ago, phatton said:

My shop manual says the recommended gear  oil for the ax15 trans is 75w90 gl-5.  The tranny holds about 3.5 quarts.

 

But that was superseded when the factory realized that GL-5 formulated gear oil was eating the synchronizers. Jeep now recommends 10W30 motor oil.