Let myself or one of the other Techs look into this before ANY one tries a different lube in their trans.
Many a synchroniser assembly uses a friction material not unsimilar to an auto trans clutch, and the wrong lube in the trans spells disaster for the gearbox.
A guy drained the Dextron II from his Viper T-56, pumped it full of GL-5 gear lube and wasted an otherwise fine transmission to the tune of $4500.