Tru Cool Heavy Duty


Most online orders received before 1pm CT (Monday-Friday) will ship the same day.
Tru Cool Heavy Duty transmission cooler kits
1 1/2" thick Cooler kits
Ideal for trucks, heavy duty cooling, RV use and towing applications!
LPD (Low pressure drop) highly efficient transmission fluid cooling technology that combines improved protection against lube system failure with the required levels of optimal heat transfer.

For use with 5/16" & 3/8" transmission cooler lines.
Do not use on 1/2" or larger lines used on some Chrysler diesels and Allison transmissions.

Tru Cool Max


Cooler Installation Information and Guide

Part #     Name     Description Image Price  
4588       Tru-Cool LPD, thick cooler & standard installation kit
On Special!
Truck & heavy duty to 19,000 GVW
Low pressure drop cooler, 5 3/4 x 11 x 1 1/2 thick

  $91.46
4589       Tru-Cool LPD, thick cooler & standard installation kit
On Special!
Truck & heavy duty to 24,500 GVW
Low pressure drop cooler, 8 x 11 x 1 1/2 thick

  $110.20
4590       Tru-Cool LPD, thick cooler & standard installation kit
On Special!
Truck & heavy duty to 28,000 GVW
Low pressure drop cooler, 12 x 11 x 1 1/2 thick

  $127.84
4739       Tru-Cool MAX transmission cooler with external thermal bypass
Tru-Cool # LPD4739-1 cooler plus a # 708-4739 Remote external thermal bypass
40,000 GVW rating, 45,000 BTU rating
8 1/2 x 22 3/4 x 1 1/4 inch
3/8 inverter flare (fittings are included for thread to hose barbs) Includes external thermal bypass for cold climates!

  $187.37
4739-1       Tru-Cool MAX transmission cooler *without external cold weather thermal bypass
Tru-Cool # LPD47391 40,000 GVW rating, 45,000 BTU rating
8 1/2 x 22 3/4 x 1 1/4 inch
3/8 inverter flare (fittings are included for thread to hose barbs)
WITHOUT external thermal bypass. Lower cost for locations where there are mild winters!

  $139.00
4920-1       Tru-Cool MAX transmission cooler (Mini Max)
3/8" hose barbs on side of cooler.
Size 4 x 23 x 3/4 inch
WITHOUT external thermal bypass!
8 plates, 24,000 GVW / 22,000 BTU ratings

  $114.22
4921-1       Tru-Cool MAX transmission cooler (Medium Max)
3/8" hose barbs on side of cooler.
Size 6 x 23 x 3/4 inch
WITHOUT external thermal bypass!
12 plates, 30,000 GVW / 34,000 BTU ratings

  $162.02
4921-1K       Cooler kit for RIALTA GROUP (U.S. Version)
Package Includes:
4921-1, Tru-Cool cooler (Medium Max)
75496K KIT, VW095 COOLER ADAPTER
2 - Transmission cooler hose of 4 1/2 foot
708-4921, Remote external thermal bypass NOT INCLUDED- order separately as needed

  $178.45
708-4739       Remote external thermal bypass
External thermal bypass for large coolers used in cold climates (32 degree -).
Installs in cooler line. Includes bypass only!
Use on 5/16" & 3/8" line sizes ONLY!!
Opens fully at approx. 180 +-
Click for a our PDF file installation instructions.

  $42.95
708-4921       ThermoStasis Transmission Oil Thermostat
The ThermoStasis Transmission Oil Thermostat offers a unique combination of low operating temperature, true aircraft quality construction and compact configuration.
The operating temperature of 165 F degree (74 C) is ideal for optimizing the performance and longevity of automatic transmissions.
CNC-machined from aircraft-grade billet aluminum 6061-T6 and black anodized, the transmission oil thermostat has the following advanced features:
  • lowest available oil thermostat operating temperature
  • calibrated thermal motor
  • stainless steel return spring
  • integrated 3/8" hose barbs
  • double radial O-ring seal
  • Viton V90 O-rings
  • 2,750 lbf double shear stainless steel spring pins
  • low bypass design
    Click for a our PDF file installation instructions.

  •   $124.95
    75496K       KIT, VW095 COOLER ADAPTER 90-UP ( Sonnax # 119814-01K )
    Volkswagen: 01M, 096, 01P, 098 Audi: 01N, 097
    Sonnax Part Number: 119814-01K
    Adapter Kit for Remote Transmission Cooler
    Product Data Sheet
    Installation Instructions


      $59.96
    A75011C       FILTER KIT, 096/01M 96-UP(Rialta EuroVan 1995-2003)
    This fits all years of EuroVan late 1995-2003 used for the Rialta
    The very early '95 Rialta used a different transmission (098) and it uses a different filter.
    If you attempt to buy these parts from a VW dealership, the price will range from $50 to $125


      $31.44
    Most Tru-Cool Transmission oil cooler kits contain:
    Cooler, hose, fittings and hardware, 2 styles of mounting hardware - Quick connect nylon straps & steel mounting, easy installation instructions.
    (NO special tools required)
    *Some late model cooler applications may require additional fittings when installing a cooler kit.

    The 4739, 4920 & 4921 series "MAX" cooler kits do not include nylon straps! Install by brackets or included steel straps.