Best Transmission Cooler And Suspension Enhancements On A 2009 Chevrolet Suburban

Question:

im looking for an external transmission cooler to fit my 2009 suburban 1500 4x4. it has the 5.3 liter motor and 4l60 transmission. i tow a 24ft enclosed trailer with offroad toys inside maybe 5-7k LBS. and the transmission gets really hot. I live in southern cali with really hot summer days which doesnt help. other forums have people saying that setup can run at 230-240 degrees when heavy towing but im not comfortable with it getting that hot. Also the rear and squats a lot and sways a lot. i have the hitch with the torsions and sway control but im thinking maybe airbags or those SUMO pads will help the squat and sway. any advise would be appretiated. thanks

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Expert Reply:

Lets first start out my addressing the transmission temperatures on your 2009 Chevrolet Suburban. I have two options for you to consider. Both are transmission coolers, however, each are designed to mount in a separate location.

If you find yourself frequently stopping in traffic, where airflow to the radiator is restricted, I recommend using a remote mount transmission cooler like the Derale Hyper-Cool Extreme Remote Cooler Assembly w/ Fan part # D15876 in addition to the Derale Remote Mounting Kit for Transmission Coolers pat # D13022. The kit can be mounted anywhere on the vehicle regardless of airflow. If you find yourself traveling mostly on the highway without frequent stopping, I recommend using the Derale Series 8000 Plate-Fin Transmission Cooler Kit part # D13503 and installing it in between the radiator and front grill. Regardless of which cooler you choose, you will want to use the Derale Snap-In Radiator Adapter Fitting for GM part # D13035 for a seamless installation.

Now to address the rear vehicle sag. I will say that suspension enhancements are not necessary when using the correct/properly installed weight distribution system. It may be necessary to upgrade to a higher capacity spring bar if you are not within the recommended capacity of that unit. If you do choose to use a set of rear suspension enchantments, I highly recommend a set of airbags as you mentioned. The Air Lift Ride Control Air Helper Springs part # AL59526 is an excellent option for you as it will not only help to level the rear of the vehicle but will also provide an increased ride comfort.

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Conner L

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