NV4500 Synchronizer Ring Kit for Dodge Ram 5-Speed

This is the full synchronizer blocker ring set for the New Venture NV4500 five-speed manual transmission in Dodge Ram trucks. The blocker rings are the brass-faced cones that pull the gear and the shaft to the same speed before the slider engages, and they are the first wear item to go in a high-mileage NV4500. Worn rings give you the classic symptoms: a grind on the 1-2 or 2-3 shift, a notchy box that fights you until the gear oil warms up, and gears that need a double-clutch or a pause at the gate before they will drop in.

The NV4500 is the heavy-duty New Venture five-speed used behind the 5.9L Cummins and the gas V8s in 1994-2005 Dodge Ram 2500 and 3500 trucks. This kit is Motive Gear RK4500D, the Dodge-application ring kit (the Chevrolet NV4500 uses a different set, so confirm which truck the case came out of before you order). Replacing the rings as a set during a rebuild is the right call, since a single new ring against four worn ones just moves the grind to another gear.

On the bench these go in during teardown, as the gear stacks come off the mainshaft and countershaft. Fit each ring to its matching gear cone dry and check the gap with a feeler gauge before you build the stack up - a ring that already sits close to the gear face is worn out or mismatched. Replace the keys and springs while the case is split, set your endplay to spec, and fill with the correct manual transmission lubricant on reassembly. New Motive Gear parts, one year warranty, ships from the USA.