Tru-Cool Max transmission cooler by Long Manufacturing
Part number: LPD4739
GVW Rating: 40,000 GVW
BTU Rating: 45,000
Thermal bypass included
Cooler size: 8.5" x 22.75" x 1.25"
The fittings on this cooler are 3/8" inverted flare.
Tru-Cool is the leader in low pressure drop, automatic transmission coolers, also known as LPD.
This is the ultimate cooler for heavy towing and is a must for heavy duty applications, including racing. Heat is what kills an automatic transmission. If you want to extend the life of your transmission and avoid a premature, costly rebuild, this is very cheap insurance.
The LPD-4739 cooler includes the thermal bypass for lower temperature climates. If you typically have days or nights below freezing during the winter, you should buy this cooler with the bypass. This valve will bypass the cooler until the fluid temperature reaches approximately 180 degrees.
All parts and instructions are included to mount and plumb this cooler. If you want to install this cooler with upgraded hose and fittings, the 5/8”-18 threads in the cooler would allow you to convert over to AN style to use with braided or Socketless hose. Upgraded line and fittings would need to be purchased separately.
Retail price is $200+.
All True-Cool coolers come with a manufacturer's limited lifetime warranty.
Alternate part numbers: OC-4739, OC-4739, LPD-4739
Frequently Asked Questions
1. Why do I need a thermal bypass?
The thermal bypass is an added valve that goes in the transmission line. When the transmission is cold, the thermal bypass will "bypass" the cooler so it can bring the transmission up to operating temperature more quickly.