Like I stated previously, the weather around here has been VERY hot and the transmission still has not hardshfited once now in months of use with the ZZP towels and the 2 18,000 GVW coolers. It has been shifting perfect despite the very hot weather with the A/C running almost constantly although on a recent run at night with cooler weather and no A/C on, still no hard shift issue. There is no question that the shift kit and coolers have resolved the issue. When you look at the cost of the kit at around $30 and the double stack Long cooler for about $50 each, for me, the whole job was a little more than $100 (definitely with 1 1.5 inch double stack 28,000 GVW cooler). I don't count the Dex VI and filter since that would have to be done at some point no matter what and is a regular maintenance item either way and just insurance on any tranny regardless of this install-good insurance. My fluid has been well maintained but I plan on going back to my old transmission fluid schedule from now on with the 4T65E of about every 20,000 miles or 3 years which ever is shorter than I had been doing before the problem surfaced (please read the beginning of the thread for specifics). It appears that for everyday use the 4T65E's shortcomings are very hot running temperatures along with weak accumulator springs. Glad it worked for another poor victim of the 4T65E hard shift issue!