Yukon Dura Grip is a positraction limited slip differential that provides smooth yet aggressive traction, giving you the confidence and performance you need across a wide variety of terrains. The Dura Grip is engineered for long life and is completely rebuildable. Dura Grips are constructed with a high strength nodular case, forged 4320 chromoly spider gears, and composite clutches. For unmatched positraction performance, the Dura Grip is the ultimate choice. When your vehicle demands performance, durability and strength, choose Yukon Dura Grip. 55P GM 3.73 & down Yukon Dura Grip Limited Slip, 17 Spline.

Positraction Composite Clutches Features:
Fits 3.73 Gear Ratio & Down (Also Fits Thick Gears) Fits 55P GM with 17 Spline Axles Fully rebuildable design and proudly assembled in the USA Limited Slip Differential with Composite Clutches All units are backed by extensive product testing and state-of-the-art software design Yukon Dura Grips feature 4320 chromoly spider gears for ultimate durability Gears are cut to provide the strongest teeth possible in any terrain Details: AAP Selling Package Quantity UOM: EA Aap uda 12: EA Aap uda 22: 1 Assembled: Yes Axle Shaft Spline Quantity: 17 Axle Type: semi Floating Bolt Hole Quantity: 10 Case Included: Yes Differential Brand: GM Gear Ratio: 3.73 and down Heat Treated: Yes Material: Steel A factory thin ring gear was used on 1955-1956 carriers with ribs on the back of the ring gear side. The 1955-1956 open dropout casting numbers end with 306 inch. A new ring and pinion or ring gear spacer is required when replacing the factory 4 series case. Yukon recommends the use of high grade Non-Synthetic GL-5 gear oil and Yukon LSD (Limited Slip Differential) additive for long life and smooth operation. Part number Oiladd. The use of synthetic oil is not recommended and may result in aggressive or noisy operation.

Fitment Notes:
Yukon Dura Grip Positraction GM 55-64 Passenger Car Dropout 3.73 & Down Ratio 17 Spline