Check the listing for details. Red Line 58404 Lightweight Shock Proof Gear Oil, 1 Quart. Condition: New. Listed at 23.97 USD. Red Line 58404 Lightweight Shock Proof Gear Oil, 1 Quart Red Line's Lightweight ShockProof Gear Oil is a unique gear oil designed to lubricate racing transmissions and transaxles which see serious loads (not recommended for most syncro-type transmissions). It has excellent low-temperature flow which allows easier shifting when cold and may be used to obtain maximum power transfer in racing differentials which do not see high temperatures. It is similar to a 75W140 gear oil, but with the lower internal friction of an SAE 30 motor oil. ShockProof Gear Oils are unique lubricants containing a suspension of solid microscopic particles as an extreme pressure agent--unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscosities. The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness greater than an SAE 250 grade, with the same low fluid friction as with our 80W140. It is recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes and offers a "best of both worlds" balance of relatively low drag and the utmost in protection. Improves durability in high-performance useReduces metal-to-metal contact as well as gear noiseProvide gear teeth shock loading protection as well as giving a thicker oil films between gear teethContains a unique solid dispersion which cushions gear teeth to help prevent tooth breakage and allows the use of lower viscositiesFilm thickness greater than an SAE 75W140, yet low fluid friction like 80W gear oil or 30W motor oilExcellent low-temp flow, improved cold shiftingFor racing differentials under moderate loadsPopular 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