Tru-Cool Long brand Transmission Cooler External Thermal Bypass 708-4739P6

Seems like a well designed and manufactured part.It's pretty hard to over cool a transmission, so this is really only needed in areas that see sustained temperature below 15*F or so.

Replaced with another brand after the second one didn’t work

Well worth the extra money for this! Essential item especially in the north and if your bypassing the stock coolers in the trans and adding a external cooler.

I had one of these for about 10 years in my car in combo with a very large transmission cooler. It finally got stuck and was causing some issues with the trans. I put a new one and it everything is working good again. I have the cooling capacity of a very large stand alone cooler without worrying about overcooling in the winter.

Took me a while to figure out how to properly plumb it in…allowing full use of auxiliary transmission cooler(relying less on internal radiator transmission cooler) as it has its hands full keeping engine cool when towing. Also, ensuring it comes up to proper operating temp when not towing. But, so far I’m happy.

The valve would not open either to the cooler or to the transmission. Unfortunlely I didnt install the valve when I got it. So could not return it. A word of advice is to install the valve soon after you receive it.

If the fit and finish were any indication of the quality of this product it’s worth buying. Unfortunately I lost it before I could install it. I’m sure I will give a better review of how it works when I buy another one and yes I will buy another one!

using it for oil cooler on Harley. Maintains 200 degrees on hot days, but bypasses cooler until 180 degrees. Best of both worlds.