Applying more modern cooling methods that have been developed since Vanagons were originally manufactured, we are proud to be rolling out the aluminum heat sink transmission cooler. These are a more efficient and compact cooling solution than both the stock set up and external cooler alternatives. Lots of details on the site both on our write up and how this offers you some alternative options for your coolant lines (as you eliminate the need for coolant to be run through the cooler - huge bonus), and additional details and pictures from the manufacturer. Please note that this cooler (and the stock cooler) are designed to be used with stock application engine or conversions up to 120hp.  In more extreme cases (such as Subaru 2.5 or some TDI's, it may be necessary to use an external cooler with a dedicated fan. For more details, please go to this link.