Lucas Synthetic SAE 75W-140 Trans & Diff Lube is a pure-synthetic, non-foaming, super-slick, long-lasting lubricant designed especially for heavy duty or high performance applications where other gear lubricants just aren?t good enough. Contains a special additive package that cushions gears and resists ?squeezing out? under extreme pressure. We have improved the high speed shock load and significantly improved anti-wear performance, which provides the ultimate protection to the gear components. Especially designed to stand up to high temperatures without losing its lubricity. Excellent to quiet whines in noisy differentials. EXCEEDS ALL GL CLASSIFICATIONS API MT-1, API GL-5, MIL-PRF-2105E, MACK GO-G, PG-2 Limited Slip