Deezel Doug,
I was using 5W-30 in my 6 speed, but after 2,000 miles, I started having 2nd to 3rd gear clashes. Dumped the AMSOIL and re-installed the factory lube and the problem went away. Others say the AMSOIOL works great??!! Who knows.
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2000 24V, 6-speed, Flame Red, Agate leather, 3500 QC, 4X4, SLT+, 4:10's, LSD, AMSOIL Air/Oil filters and all Fluids, 275 RV squirters, S. S. nerf bars, Line-x, Autometer Ultralites Pyro/Boost gauges, MOPAR tow hooks, Rancho 5000 steering Stabilizer, Rickson 19. 5's with Cooper C-140's, Sky-Jacker 2 1/2" lift in front, Upper & Lower control arms, DT Pro Fab track bar.