I have a 2002 cummins ho w an nv5600. Shift great normal chatter and stuff makes a noise when you press clutch pedal all that. Is it normal to have occasional rough downshifts? It feels like it takes a second to fully engage the gear. Possibly because its heavier than a stock than a stock unit? Changing my fluid w amsoil synchromesh this week. And installing fast coolers as well.