I’ve got a Hayden cooler I believe the 698 or 678 sitting in a box waiting for install.
Definitly need to do a trans flush. I’ve been stacking needed products to do allll the fluids soon. Diffs, trans, motor, transfer, even got me a grease gun to do the UCAs and drive shafts.
These things will last if taken care of.
One issue that seems to be popping up a lot is the coolant valley leak.
I upgraded the GX470 oem cooler with the Hayden 679 (I think it was the 679?) and I felt it did a really good job of not only handling the towing, but also allowed the trans to stay warm in the cold WI winters which is just as important imho.
I fab'd my own brackets for the 470, and likely will also for the 460. The truck has 53k miles now, and I will have a trans fluid exchange done at Toyota after I get the cooler installed. I'm really surprised the GX460 didn't come with a larger trans cooler, as it really does need it when towing imho. I plan on keeping the 460 for a while, and think it's essential to add the cooler. I'm also curious if the trans fluid is currently low, as cruising on the interstate at 70mph @ 85* ambient I am seeing close to 195* avg trans temps. Too hot imho.
How hard is the install? I'm likely going to be towing a trailer from CT to north Maine next month...