Join Date: Aug 2007
Location: Eaton Rapids, Michigan
Redline MT-90 is the way to go. I changed the fluid in mine with Valvoline Syn-power full synthetic 75w90 then got to reading on this forum that a GL-5 lubricant is not the way to go in the AX5-AX15 transmissions. I sent a note to Valvoline regarding transmission usage and they replied that the additives they use will not attack the yellow metals (syncros). I dumped it anyway and put in the MT-90. The transmission is not near as notchy, although when cold, it feels like there is a hook on the gears between 1-2 and 2-3. If you care to double clutch, it is very smooth. My Jeep shows 135,000+ on the clock, so I'm sure there is plenty of wear in the transmission.
Back to the OP, I went to the DC dealer to get the "special" AX transmission fluid. I had a DC part number that I picked up off the web. The parts guy said the number had changed to a new number. He looked up the cross reference and eventually came back to the parts counter with a quart of DC 10w30 motor oil. I opted to change it to the Valvoline Syn-power 75w90, then dumped that for the Redline.
1997 Red Wrangler 4.0L - 5 speed - soft top w/full frame doors - 2 inch spring spacers and 1 inch body lift - 31 x 10.50 BFG on 15 x 8 Pro Comp 8069 rims