Renew the surface your bearing rolls on with the National Differential Pinion Race / Manual Transmission Input Shaft Race, part number HM88610. It fits many vehicles, among them the 1997-2017 Jeep Wrangler, 1994-2003 Dodge Ram 1500 and 2001-2018 Chevrolet Silverado 1500, as a direct-fit replacement for the listed applications.
This race is cataloged under two names, differential pinion race and manual transmission input shaft race, because one part number covers both uses. It is the outer ring (cup) of a bearing assembly. It seats in its housing bore and gives the bearing's rolling elements a surface to run on, helping support the shaft as it turns.
- Brand and part number: National HM88610.
- Dual application: listed as both a differential pinion race and a manual transmission input shaft race.
- Cataloged positions: front outer, front inner, rear outer and rear inner, depending on the application.
- Quantity: the listed applications call for one.
Signs a race may need replacing include a whine or growl from the differential or transmission, or pitting and wear on the race surface found during teardown. Diagnose the cause first, because gear, bearing and lubrication problems can make similar noises. Many technicians replace the race together with its bearing cone. Set pinion depth and preload as the vehicle service information directs. See the "Vehicles it fits" section for the full list of fitting vehicles.
Frequently Asked Questions
What does the National HM88610 race do?
It is the outer ring (cup) of a bearing. It seats in its housing bore and gives the bearing's rolling elements a surface to run on while the pinion or input shaft turns.
Why is HM88610 listed as both a pinion race and an input shaft race?
National catalogs HM88610 under two names, differential pinion race and manual transmission input shaft race. One part number covers both uses across different applications.
Which positions is this race cataloged for?
National catalogs HM88610 for front outer, front inner, rear outer and rear inner positions, depending on the application.
Does it fit my 1997-2017 Jeep Wrangler?
It is listed for the 1997-2017 Jeep Wrangler, the 1994-2003 Dodge Ram 1500 and the 2001-2018 Chevrolet Silverado 1500, among many others. Check the "Vehicles it fits" section to confirm your exact vehicle.
What are signs the race may need replacing?
A whine or growl from the differential or transmission, or pitting on the race surface found at teardown, may indicate a worn race. Diagnose first, since gears and bearings can make similar noises.
