How do you read the oil dipstick for an Allison duramax transmission?

To read the oil dipstick for an Allison Duramax transmission, first ensure the vehicle is on a level surface and the engine is at operating temperature. With the engine running, pull the dipstick out, wipe it clean, and reinsert it fully before removing it again. Check the fluid level against the marked indicators on the dipstick; it should be within the "hot" range, typically indicated by two notches or marks. If the level is low, add the appropriate Allison Transmission Fluid as needed.