I've got an 06 with the towing package with transmission cooler but assuming my Torque app was reading my temps correctly, I'm still running warmer than I'd like while towing my Jayco 23B. I weighed the trailer empty and it weighted 4025 and there is no way I had any more than 1000 lbs worth of stuff. Ambient temps were in the 80's. Coolant temp never reached 200. Transmission temp #1 (pan I believe) was running in the 220 and briefly peaked at 250 on a long straight incline. #2 (coil I believe) ran in the low 200's. In doing some research it looks like there are better, more efficient coolers out there.
I was thinking about going with either the 1678 or 1679, both of which I've seen pics installed in Tacoma's in older threads. I found this site with a ton of choices but I couldn't really tell you what I'm looking for.
Is the larger cooler inherently better or are there other factors I need to take into account. Does anybody has any experience with these and if they saw a noticeable improvement? Anybody have any opinions on anything better out there? From my research it looks like the plate and fin type is better at cooling.