I have installed a
remote tranny filter and a
external oil thermostate on my 92 svx. I also have a 3/4" thick cooler sandwiched inbetween my rad and condensor. It is a little tricky getting the plumbing done but it works. Tranny temp warms up faster.
The remote filter is a summit brand but it is made by Perma-Cool. That is the filter it came with. There is no hole in the top for a temp gauge though. You can drill and tap one because the casting allows for it.
The thermostate is rated at 180 deg. I have had no problem with it. and I still use my stock cooler too.
Steve