I had a transmission shop do the work. Just had a heart stent done with 2 more to go, (because of only 1 kidney), so I'm not able to do the work myself right now.
This new cooler & the existing cooler are run in tandem. Were the tubing was cut, it was flared for a proper seal with the clamp. small, angle shaped aluminum strips were used to mount the cooler away from the radiator so road dirt doesn't get packed between it & the radiator over time.
I was expecting to see a dramatic drop in trans oil temp but such is not the case. There is a bypass valve in the factory trans line that bypasses the factory cooler until the fluid temp reaches a certain temp. The added cooler keeps the fluid temp down for a very long time. the normal operating temp on mine used to be 196° after a few miles of driving, but now keeps it much lower, much longer. I can drive 30 miles & the temp is still below 190°. The temp eventually does get into the 190° range, but even when it hits 194° in stop & go traffic, that is just temporary as it drops back down once you get moving again, something it has never done before. I haven't towed yet with this cooler on, but my guess is that it will not allow the trans oil temps to go up to the 205° range while driving or even the 228° it got to at one point as I was maneuvering & parking the 6K pound trailer. It will probably keep the trans oil temp below 200° now.
They did drop the pan & change the filter.
A lot more piece of mind!