Shop By Truck

Service Department

73421 DRP Transmission Cooler Lines 5/8" - GM 2001-2005

SKU: DRP73421
Mftr. Part#: 73421
UPC: 887753065377
Manufacturer: Deviant Race Parts
2001-2005 GM 6.6L Duramax LBZ LMM - GM's factory transmission lines leave something to be desired. DRP's 5/8-inch cooler line kit completely replace the OEM lines with 1500psi rated industrial hydraulic lines.

PRODUCT DETAILS (click to expand)

Mftr. Part#73421
Weight (lbs.):9.70 lbs.
Dimensions:4.50" x 14.50" x 14.25"

PRODUCT SPECS (click to expand)

Attribute nameAttribute value
Product TypeTransmission Cooler Lines
Line Size5/8"
Truck FamilyGM Duramax LB7/LLY 2001-2005
Transmission TypeAllison A1000
Truck Type/ModelDuramax


Deviant Race Parts LEAK FREE Transmission Repair lines for 01-05 GM 6.6L Duramax equipped Pickups with the Allison 1000 Transmission. If you have the dreaded leaky transmission cooler lines on your GM full size Duramax/Allison pick up truck this is the answer you have been looking for! For a permanant solution to your leaky transmission lines choose the Diesel Race Parts Transmission Cooler Repair Lines. Made from 5/8" Parker industrial hose that is rated at 1500 psi. This will cure your problems especially in the cold weather climates where this problem is most prevelant.


  • 5/8" 1500psi rated Industrial Strength Hydraulic Lines
  • All necessary fittings and adapters to bolt up to factory locations
  • Full, step by step, instructions
  • Install Difficulty: 2 out of 5 wrenches (1 wrench being easiest)
  • Lifetime Warranty