Hello all, I currently have a 2004 Tahoe 4.8 liter with a 3.43 axle ratio. I recently purchased a new travel trailer. I did a bunch of research before making the trailer purchase and I am well within my towing limits. I recently took it on it's first two trips and it performed very well with the trailer. But, I am slightly concerned about the transmission temp. I live in Phoenix AZ and it gets really hot here. I understand they are not very expensive. I'm looking for any information anyone might share. Is it necessary? Good online place to buy one? model? price I'd expect to pay? Can a generally handy home mechanic install it? Thanks in advance.