Redline Heavy Shockproof Gear Oil (1 bottle) $14

Redline's Heavy Shockproof Gear Oil is a unique lubricant 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.

Recommended for heavily-loaded racing differentials and transmissions, Off Road racing and problem gearboxes.

The viscosity characteristics allow the lubricant to resist throwoff and provide a film thickness similar to a 75W250 grade, while providing the same low fluid friction as an SAE 75W90.

Acting like a liquid grease, the viscosity characteristics of ShockProof allow the lubricants to resist throwoff and provide the protection of a greater film thickness with relatively light fluid viscosity, offering a "best of both worlds" balance of low drag and superior protection.

ShockProof products work in a variety of differential and transmissions, however, should not be used with pumps, filters, and with small lines, these fluids are designed wet sump or splash type lubrication.

Evo's:
Use one bottle for the transfer case.
One bottle for the rear diff.

If you're running this in your rear diff, the clutches will engage a bit more aggressively, so you might feel some binding up of the rear wheels at low speed turns.