Cooler line size

SSMinnow

SSMinnow

New member
Going to add a aux cooler and filter to a 77 tf727 in the same year Scout with a 345. Does the size of the line matter? Either it will be steele or transmission rate rubber line.
 
The oem steel heat exchanger lines are 5/16", same as the fuel supply system. There is no need to use anything other than that in steel. The hydraulic hose material supplied with the typical auxiliary heat exchangers is properly sized to work with the oem fittings/ports.

Unless you are going to add a thermostatic control, the additional heat exchanger should be plumbed in series with the radiator system, just like the instructions recommend. Transmission fluid temps that are "too cool" are just as damaging as "too warm".
 
You must log in or register to reply here.
Back
Top