Transmission Cooling: Notes

The transmission fluid cooling system, without an auxiliary transmission fluid cooler, consists of:

• an in-tank fluid cooler inlet tube.
• a non-repairable in-tank transmission fluid cooler.
• an in-tank fluid cooler return tube.

The transmission fluid cooling system, with an auxiliary transmission fluid cooler, consists of:

• an in-tank fluid cooler inlet tube.
• a non-repairable in-tank transmission fluid cooler.
• an auxiliary fluid cooler inlet tube.
• an auxiliary transmission fluid cooler.
• an auxiliary fluid cooler return tube.

The transmission fluid flows from the transmission to the in-tank transmission fluid cooler, to the auxiliary transmission fluid cooler and returns to the transmission.

For fluid cooler flow testing, backflushing and cleaning procedures, refer to AUTOMATIC TRANSMISSION - 6HP26 or AUTOMATIC TRANSMISSION - 4R70E/4R75E .

Fig 1: Identifying 4R70E, 4R75E Transmissions With Auxiliary Transmission Fluid Cooler Components

Courtesy of FORD MOTOR CO.

Fig 2: Identifying 4R70E, 4R75E Transmissions Without Auxiliary Transmission Fluid Cooler Components

Courtesy of FORD MOTOR CO.

Fig 3: Identifying 6HP26 Transmission With Auxiliary Transmission Fluid Cooler Components

Courtesy of FORD MOTOR CO.