I bought my 99 TJ a couple of months ago. I am in the process of changing all the fluids, as I don't know what's in her nor how bad she's been treated.
So this past weekend I changed the fluid in the AX15. Redline MT-90 is not carried in any of my local stores. I know GL5 is a no no, and 10w-30/40 seems to be what is now recommended. I wanted to put in something a little better in her, so I put in Royal Purple 15w-40 Synthectic motor oil.
Before - It was a little stiff and did not like to come out of gear to down shift, until the wheel speed and gear speed where fairly close.
After - Now it is slow to synch in any gear, I have to put a little preasure on the gear I want, then ease off then put preasure back on and it will
usually go on into gear. Of course when wheel speed and gear speed are close, the problems are minimul. It does not grind unless I try to force it in gear before it is ready. Sometimes this means just holding the clutch in for a few extr seconds while it declerates.
It sorta feels like it's too thick and slow to synch. Iv'e got about 50 miles on the new fluid.
Should I try 10w-30?
I hate to waste the money I spent on the RP.
Should I give it longer to settle in?
I can get NAPA GL4 locally, but I'm not sure that would be any better than what I have.
I can order the RedLine MT-90, but I hate to waste the RP and end up with the same results.
The RP 15w-40 is close to the same viscosity as the MT-90 from what I have read. So I don't see why would be causing any issues.
Thanks in advance.