Pro Gear 75w190 Gear Oil Case 4 x 1 Gallon

Pro Gear 75W190 Gear Oil Case delivers four 1-gallon containers of heavy-duty synthetic lubricant engineered for high-stress drivetrain applications. Whether you're running a lifted truck, performance differential, or modified transfer case, this viscosity grade is the workhorse choice for mechanics and enthusiasts who demand reliability under extreme load and temperature swings. The 75W190 rating provides the thermal stability and film strength required when stock gearing meets custom power outputs or aggressive off-road duty.

The 75W rating ensures cold-flow performance in winter starts, while the 190 hot-viscosity index maintains a protective boundary layer at elevated operating temperatures—critical when differentials see sustained RPM under load. This gear oil formulation resists shear breakdown, reducing viscosity loss over extended service intervals and protecting helical and hypoid gears from metal-to-metal contact. The four-gallon case format makes it practical for fleet maintenance, multiple vehicles, or shops that service differentials regularly, eliminating frequent reordering and ensuring you always have backup stock on hand.

This Pro Gear formulation is ideal for limited-slip and locking differentials, manual transmissions in classic and modified vehicles, and any drivetrain where OEM 75W90 falls short of load capacity. Verify your specific differential or transfer case manufacturer recommendation before use—some units require friction modifiers or synthetic approvals that vary by platform. The case weight of 32.59 lbs reflects four full gallons, making it manageable for storage while keeping spill risk low during pours into gear boxes with restricted fill necks.