4L & Appropriate Adapter Bracket for 8HP70, NAG1, TR6060, 545RFE/46, or A727 Transmission • Black Coating for Durability and Corrosion Resistance • Engine Location Eliminates the Need for Modifications to Firewall & Brake Booster. 6) Transmission. Durango R/T still offers the most muscle for the dollar in the segment with its iconic 5.