The two L-brackets would be for the top, and the dog-legged bracket would connect to an existing hole in the lower front crossmember. The L-brackets will sit in between the radiator support plate and an L-brace for the front clip, so the mounting hardware had to be pretty low profile. Since the cooler just bolts to the mounting brackets you could just pop-rivet them in place too.
Now that the cooler was mounting, it was time to do some plumbing. If you get a large enough cooler, you can actually bypass the heat exchanger in the radiator all together.
If you live in colder climates though, you may want to keep the radiator in the system to help heat the tranny fluid up some in the winter time. In this install I actually bypassed the radiator all together. Jeep apparently switched where the lines connect to the radiator sometime in the late s, despite the fact that the FSM for those years still shows the old line routing.
Either way, the line coming from the front of the transmission is the feed line, and the line going to the rear of the transmission is the return line this is the one you want. If you opt to bypass the radiator and use the cooler stand-alone, just remove the fitting from the radiator and plug the holes, then cut both soft lines and spline in your between them.
With the cooler installed and plumbed in, I fired up the engine to check for leaks, just in case. You can find transmission mounting kits here. In some applications however, it may be best to have a remote mounted transmission cooler that utilizes a fan to help cool the fluid.
This is typically found in more extreme applications such as those who drag race or tow for example. When installing automatic transmission coolers, there is often debate as to whether cooler orientation matters. More often than not, transmission cooler orientation does not make much of a difference.
While some may argue that you need to install a certain type of cooler inverted to prevent air bubbles, the transmission line pressure it strong enough to push fluid through the entire cooler to prevent this. A common question we get asked is whether it is recommended to bypass the radiator with your external transmission cooler. The easiest answer to this is, it depends. There are a number of factors that determine if you should use your trans cooler as a stand alone unit or in series with the factor radiator transmission cool.
If you live in a very warm area, it may be better to bypass the factory transmission cooler in the radiator in favor of a larger, external transmission cooler. It is recommended however to keep the factory radiator transmission cooler and use and external cooler if you live in a cooler climate. The factory cooler will help get the transmission temperature into a suitable range.
When it comes to cooling your transmission, you can actually over cool it, and it may not be able to flow as well compared to warmer fluid. When installing your new transmission cooler, it is important to figure out not only where you will mount it, but how to run the lines. In most applications where the external trans cooler is used in addition to the factory one, you will need to route the new transmission lines from the radiator to the external cooler.
The below transmission cooler installation diagram shows the transmission fluid flow direction and how the fluid will be routed through a new external cooler. You will need to determine which line is the return for the transmission. You want the already warm fluid to flow into the external cooler to help better control fluid temperatures, so the transmission cooler flow direction will look something like this:. This can be done with a double sided barb fitting, or by flaring the metal line and then clamping the new rubber hose to it.
Aside from the purchase of a transmission cooler, additional costs may come from extra parts such as transmission fluid, transmission hose, clamps, fittings, and mounting pieces. A number of transmission coolers come with installation kits that contain most of these items aside from fluid. However, it is recommended to figure out what you need before buying a complete kit.
If you were to just purchase the cooler then source the additional parts needed, there would not be much of an additional cost. If you have a desire to run custom lines and AN fittings, then the cost will certainly increase.
While installing basic rubber lines might work for most, in some cases, your vehicle may need custom lines, which are more costly than standard transmission lines. Ultimately, the cost to install an automatic transmission oil cooler is dependent on what your needs are. When installing a transmission cooler in your car, truck or SUV, it is important to consider not only the cooler size, but where to mount it, and how to run the lines.
Mounting a transmission cooler is typically best in front of the air conditioning condenser so it gets ample air flow.
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