Transmission oil coolers must be properly flushed using a power flush machine. These power flushers properly flush and pulse transmission coolers and lines to remove metal, dirty oil, and material from a failed transmission prior to installing a remanufactured transmission.

Using solvent and air is not the proper procedure for flushing out transmission coolers and lines. There are store bought products such as Trans Flush that aid you in flush your transmission cooler and lines, but does not produce the same results as using a power flusher.

Hydraulic Transmission Types - Improperly flushed transmission cooler and lines will leave behind debris can cause sticky governors, wrong gear starts, stuck valves, shift issues, and premature failures in your newly installed remanufactured transmission.

Electronic Transmission Types - Improperly flushed transmission cooler and lines will leave behind debris can wreak havoc in electrical controlled transmissions. Electrical solenoids and valve bodies when energized under normal operation act like electro magnets. These "Electro-magnets" will tend to pickup any metal or debris left in the transmission cooler and/or oil. This can cause malfunctioning in valve bodies and solenoids causing wrong gear starts, shift issues, low line pressure, skipped shifts and late shifts.

Engine Stalling - Many times a plugged or restricted transmission cooler will cause the engine to "Stall" when put into reverse. This is cause from a lack of oil feed to the transmission causing the lock-up torque converter to engage or restrict flow.

Many vehicles after transmission failure require that the transmission cooler/radiator be replaced in order to reduce repeated failures. This mandated by the factory in many service bullentins as well as by ATR. The reason is this...Many of these vehicles have a "fin type" transmission cooler in the radiator and after a major transmission failure, the debris from the failure plugs these fins and will restrict flow causing damage to a transmission quickly.

This can be avoided in one of two ways:
1. Replace the radiator in the vehicle (Trans cooler in radiator), which is very costly.
2. Use an External By Pass Cooler

An inexpensive way is to completely by pass the trans-cooler in the radiator (not running through the radiator cooler at all), and installing a Heavy-Duty external transmission cooler. These are easy to find at any Auto Parts Supply House. ATR recommends a large transmission cooler that fits your vehicle's front radiator/condenser space.

The following is a list of Transmissions that requires a mandatory transmission cooler replacement.

Ford E4OD and 4R100 Series

Ford 5R110

GM 4L80E Series

Chrysler - All 500's, 518, 618, 45RFE and 47RE Series

Jatco (Isuzu,Nissan,Mitsubishi) JR403 Medium Series Trucks

Aisin 450-43LE (Isuzu, GM Tiltmaster, Nissan, Mitsubishi) Medium Series Trucks