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3/20 Certified
NV3550 and NV5600 truck transmissions Popular replacement for and improvement over GM Synchromesh® (#12345349) and Auto-Trak II® (#12378508) and Chrysler spec MS-9224 Safe for brass synchros
Flat Black
Pre-curved arms
Red Line Shock Proof Gear Oil - Light Hoodies 3/20 CertifiedLightweight ShockProof Film thickness greater than an SAE 75W140, yet low fluid friction like 80W gear oil or 30W motor oil Excellent low temp flow, improved cold shifting For racing differentials under moderate loads Popular in racing transmissions like Hewland and other Road Racing dog ring boxes, Bert and Brinn for Stock Cars, G Force, and Liberty clutchless for Drag Racing