Best Transmission Cooler for a 2021 Toyota 4Runner  

The differerence between the three coolers you mentioned is the size overall. The #D13503 measures 11" Wide x 8-3/4" tall x 7/8" deep. The part #D13502 measures 11" Wide x 7-1/4" tall x 7/8" deep (slightly shorter) and…

When it comes to transmission coolers, unless you live in an extremely cold climate you can't over cool a transmission. Most vehicles will have a stock transmission cooler, it'll either have a separate heat exchanger or it'll have a…

The higher the Class of transmission cooler the more efficient it is and the more cooling capabilities it has. Basically, the Class of a cooler is supposed to reflect the Class trailer hitch you have. So if you have a Class III hitch you would use a…

Transmission coolers are not vehicle specific so you can basically use any one that will fit in the engine compartment. I recommend going with the Derale Series 8000 Plate-Fin Transmission Cooler Kit, #D13503. This cooler is rated for a gross trailer…

The 2019 Toyota 4Runner comes with a factory installed trailer hitch receiver and wiring. There is no information in the owners manual considering weight distribution system use but it does state to distribute the tongue weight as you can see in the…

First, the maintenance schedule for your 2003 Toyota 4Runner can be found in the owners manual. It will vary from vehicle to vehicle but unless the fluids have been changed frequently then they are probably about due. Vehicles have a factory…

Transmission and oil coolers are given class designations since we are in the towing business and those who tow are used to seeing class designations on hitches, ball mounts, etc. The idea is to give a general idea of the cooler's capacity, so if…

As long as the fully loaded and ready to tow weight of the trailer is less than the 4700 lb towing capacity of your 4Runner, you can tow the trailer as long as the factory installed hitch has sufficient capacity. The hitch should have a ratings…

The method we use to determine the correct line to install a transmission cooler on is pretty simple. You want to install the cooler on the return line. To determine which line is the return line you will want to start with your truck totally cooled…

Transmission cooler installs are all basically the same. If you check out the install video I attached you will see the #D13501 being installed on a vehicle that will give you the general idea how it would install on your 2013 Toyota Tacoma.…

I went out to the warehouse and grabbed a 7-Way Molded Trailer Wire Connector #H20046 to measure it for you. I used a set of digital calipers to get an accurate measurement. The diameter of the outer black sheath is 0.59 inches or 19/32 of an inch. A…

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…