Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Transmission Cooling
The transmission fluid cooling system, without an auxiliary transmission fluid cooler, consists of:
- an in-tank transmission fluid cooler inlet tube.
- a non-repairable in-tank transmission fluid cooler.
- an in-tank transmission fluid cooler return tube.
The transmission fluid cooling system, with an auxiliary transmission fluid cooler, consists of:
- an in-tank transmission fluid cooler inlet tube.
- a non-repairable in-tank transmission fluid cooler.
- transmission fluid cooler hoses.
- hose clamps.
- an auxiliary transmission fluid cooler.
- a transmission fluid cooler return tube.
The transmission fluid flows from the transmission (front fitting for TorqShift®, bottom fitting for the 4R70E/4R75E), to the in-tank transmission fluid cooler, to the auxiliary transmission fluid cooler (if so equipped) and returns to the transmission (rear fitting for TorqShift®, top fitting for 4R70E/4R75E).
For transmission fluid cooler flow testing, and back flushing and cleaning procedures, refer to AUTOMATIC TRANSAXLE/TRANSMISSION - 4R70E/4R75E article or AUTOMATIC TRANSAXLE/TRANSMISSION - TORQSHIFT article.
| Item | Part Number | Description |
|---|---|---|
| 1 | 7H420 | Transmission fluid cooler tube assembly |
| 2 | 7N291 | Transmission fluid cooler tube clip |
| 3 | 7890 | Transmission fluid cooler hoses |
| 4 | 7890 | Transmission fluid cooler hoses |
| 5 | 8287 | Clamps |
| 6 | 7A095 | Auxiliary transmission fluid oil-to-air cooler |
| 7 | W704723 | Nut |
| 8 | W701815 | Stud bolt |
| 9 | - | Transmission fluid inlet (part of 7H420) |
| 10 | - | Transmission fluid outlet (part of 7H420) |
| 11 | - | Transmission fluid cooler fitting-to-case fitting |
| Item | Part Number | Description |
|---|---|---|
| 1 | 7H420 | Transmission fluid cooler tube assembly |
| 2 | 14B060 | Transmission fluid cooler tube bracket |
| 3 | 7890 | Transmission fluid cooler hose |
| 4 | 7A095 | Auxiliary transmission fluid oil-to-air (OTA) cooler |
| 5 | 7890 | Transmission fluid cooler hose |
| 6 | 7J081 | Secondary latch |
| 7 | 8287 | Clamp |
| 8 | W527206 | Clamp |
| 9 | - | Transmission fluid inlet, banjo fitting (part of 7H420) |
| 10 | - | Transmission fluid outlet, banjo fitting (part of 7H420) |
| 11 | 7J227 | Transmission fluid cooler tube fitting-to-case O-ring |
| Item | Part Number | Description |
|---|---|---|
| 1 | 8005 | Radiator (with in-tank transmission fluid cooler) |
| 2 | 7A095 | Auxiliary transmission fluid cooler |
| 3 | - | Transmission fluid cooler tube outlet fitting |
| 4 | - | Transmission fluid cooler tube inlet fitting |
| 5 | 7A030 | Transmission fluid cooler return tube |
| 6 | 7A031 | In-tank transmission fluid cooler inlet tube |
| 7 | 7D273 | Transmission fluid cooler tube fitting-to-case fitting |
| 8 | - | 4R70E/4R75E transmission |
| 9 | - | In-tank transmission fluid cooler inlet |
| 10 | - | In-tank transmission fluid cooler outlet |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.