Calgary Jeep Association

4x4 Related Groups => Tech Talk => Topic started by: birdo on February 17, 2011, 09:53:25 PM

Title: 99 TJ Tranny
Post by: birdo on February 17, 2011, 09:53:25 PM

Hi All,
Just purchased a 99 TJ a couple of weeks ago.
The 5-speed manual transmission is thick as molasses on these cold days and shifting requires some doing.
Once it warms up its a bit better.
I would like to change out the gear oil to something a bit less viscous. Any suggestions? It's an AX-15 tranny.
Probably would like to go synthetic.

Cheers
John in Okotoks

Title: Re: 99 TJ Tranny
Post by: AMCJeep on February 18, 2011, 06:17:02 AM

I use Royal Purple Synchromax in mine.
It shifts like butter even with these cold temperatures.

You can get it at Mopac.

Title: Re: 99 TJ Tranny
Post by: vantagetes on February 18, 2011, 12:28:04 PM

Redline MT90!

Expensive though.

Try popping the bottom of your shift boot up out of the center console 9/10 shifting problems is that stupid boot not the tranny itself.

Title: Re: 99 TJ Tranny
Post by: birdo on February 18, 2011, 09:14:35 PM

Yeah.....was considering the rubber boot thing. That rubber sure stiffens up in the cold.
I'm not sure what's in the gear box now but when it hit minus 30 a while back, it is pretty hard to
move the shifter anywhere....

Title: Re: 99 TJ Tranny
Post by: Vinman on February 19, 2011, 06:38:13 AM

Pull the plastic boot retaining trim piece and let it "float".

Also, when you run the engine to warm it up, put the t-case in neutral and shift the tranny in 2nd or 3rd gear and let the clutch out while warming up. It really makes a big difference in warming up the tranny fluid and it will shift much, much easier.

Vince

Title: Re: 99 TJ Tranny
Post by: birdo on February 19, 2011, 12:37:41 PM

Thanks Vince,

I did that this morning and it does work. Thanks for the tip.