Brand: Motive Gear
K10/20 77-82 GM8.5F/12BT 3.73X
UPC: 00698231098455
App/Model: GM 8.5|GM 8.875 Truck
Cover Bolt Quantity: 10 Front (GM10-373)|12 Rear (GM12-373X)
Differential Carrier Break: 2.73 Ratio and Higher Front (GM10-373)|2.76 to 3.42 Ratio Rear (GM12-373X)
Differential Model: GM 8.5|GM 8.875 Truck
Gear Ratio: 3.73
Pinion Gear Tooth Quantity: 11
Pinion Shaft Diameter: 1.626 Front (GM10-373)|1.438 Rear (GM12-373X) Inch
Pinion Spline Count: 30
Prop 65 Yes/No: No
Ring Gear Bolt Quantity: 10 Front (GM10-373)|12 Rear (GM12-373X)
Ring Gear Material: 8620 Steel
Ring Gear Outside Diameter: 8.5 Front (GM10-373)|8.875 Rear (GM12-373X) Inch
Ring Gear Rotation: Standard
Ring Gear Tooth Quantity: 41
Taxonomy A: LD Differential
Taxonomy B: Ring and Pinion Gear Packages
Taxonomy C: Front and Rear
Taxonomy D: 3.73
For GM 8.5″ and GM 8.875″ – Ring and Pinions Including Timken Bearing Kits; 3.73 Ratio; Thick Rear Ring Gear; Requires a 2.73 and Numerically Higher Front Carrier; Requires 2.76 to 3.42 Rear Carrier

Installation Instructions
Installation Instructions
Installation Instructions
Installation Instructions
Installation Instructions
Installation Instructions

Warranty Period: 1 Year or 50,000 Miles

Applications:

• 1977-1981 Chevrolet K10
• 1977-1982 Chevrolet K10 Suburban
• 1977-1981 Chevrolet K20
• 1977-1981 Chevrolet K20 Suburban
• 1977-1981 Chevrolet K5 Blazer
• 1977-1978 GMC K15 Suburban
• 1979-1982 GMC K1500
• 1979-1982 GMC K1500 Suburban