The AS68RC and AS69RC transmissions used behind the Cummins in cab chassis trucks call for their own fluid, and they are unforgiving about substitutions. ATF+4 is not a replacement here. This is the genuine Mopar ASRC synthetic, formulated for slip-controlled lock-up converter operation so the clutch can hold a controlled slip without shudder or glazing.

Fluid Specifications:

• Fully synthetic automatic transmission fluid, approved against JWS 3309.
• Specified for AS68RC and AS69RC slip-controlled lock-up automatic transmissions.
• Provides viscosity stability, foam resistance and protection against rust and corrosion.
• Supplied in a 128 fluid ounce gallon bottle, sold individually.
• Supersedes part numbers 5189977AA and 5189977AB. Confirm the fluid callout for your transmission before filling.