The Dana Spicer 99508 is an Eaton Spicer single speed ring and pinion gear set in a 7.17 ratio with a 43-6 tooth count. It fits Eaton differentials 17120, 17121, 17123, 18100, 18120, 18123, 34RS and 38RS. The pinion has 10 splines and the ring gear has 1/2 in. holes. The ring gear is 66844 and the pinion is 66845. Sold by Pro Gear and Transmission. If you are unsure which differential you have, give us a call.
Features
Single speed ring and pinion gear set
7.17 gear ratio, 43-6 tooth count
10 spline pinion, 1/2 in. holes in the ring gear
Fits Eaton 17120, 17121, 17123, 18100, 18120, 18123, 34RS and 38RS differentials
Ring gear 66844 and pinion 66845
Tech Specs
- Gear ratio: 7.17
- Tooth count: 43-6
- Pinion splines: 10
- Ring gear holes: 1/2 in.
- Ring gear: 66844
- Pinion: 66845
