well... (deep subject for this shallow mind)... 98 12 valve NV4500 transmission and 5th gear went south after 131K so I replaced it with a good reman one, along with a Phoenix 13" clutch kit good for 1000lb/torq and medium towing. The reman transmission is Very hard to shift while stopped, especially trying to get into reverse. Prancing thru the gears during acceleration is not too bad... . even smooth sometimes. Got Mopar synthetic for standard trannys in it... . anybody using anything else?