you can try and use some amsoil manual transmission lube, part#MTGQT. I've used it for the last 3 years. my main problem was shifting in cold mornings. before i used mobil1 75w90, but it was not a syncromesh and amsoil is.
89 Wrangler, 2.5L TBI, D30 Truetrac 4.56 gear front, Super 35 4.56 gears rear, 31" BFG Mud's, 15x9" weld racing pro-stars XP's, 2.5" rancho and 1.25" shackels, superior axles. rear wilwood disc brakes
2008 wrangler x unlimited. Stone white. Motech 5.3L LS Chevy