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Motive Gear Master Ring and Pinion Installation Kits
Ring and Pinion Installation Kit, Master Kit, GM, 8.875 in., 30-Spline Pinion, Truck, Kit
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Estimated Ship Date: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
R12RMK
Part Type:
Product Line:
Summit Racing Part Number:
MGR-R12RMK
UPC:
698231034446
Differential Case Design Type:
GM 8.875 in. (12-bolt), truck
Cover Bolts:
12
Ring Gear Bolts:
12
Pinion Spline Count:
30
Ring Gear Rotation:
Standard
Cover Gasket Included:
Yes
Pinion Shims Included:
Yes
Carrier Shims Included:
Yes
Crush Sleeve Included:
Yes
Pinion Seal Included:
Yes
Pinion Nut Included:
Yes
Ring Gear Bolts Included:
Yes
Head Bearing Included:
Yes
Tail Bearing Included:
Yes
Carrier Bearings Included:
Yes
Axle Seals Included:
No
Axle Bearings Included:
No
Quantity:
Sold as a kit.
Notes:
Fits 1963-82 12-bolt truck. Kit includes Koyo bearings.
Motive Gear Master Ring and Pinion Installation Kits
Motive Gear master ring and pinion installation kits include everything that's in their regular differential kit—plus pinion shims, carrier shims, and ring gear bolts (where applicable). You also have the option of upgrading to higher quality bearings by adding "T" to the end of the part number on some models. Make a better choice for your ring and pinion installation with Motive Gear differential master bearing kits. Order the model designed for your vehicle application.
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Some parts are not legal for use in California or other states with similar laws / regulations
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