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Greetings, I bought my my 1985 22RE automatic with overdrive New Horizon about 3 years ago. According to the person I bought my RV from, the transmission was rebuilt and had only 30k miles on it. Same person said overdrive didn't work, nor did the transmission cooler and it was not important. OD does work, the transmission cooler was/is disconnected. I've driven the RV about about 4000 miles since owning it. It has about 75 k original miles. I've gone over the grapevine probably 6 times. Taking it super easy, nonetheless it's a big long climb... sadly, I left it in OD going up the hill (I didn't know any better). Tachometer on, watching it, keeping that in check. The transmission acted up going into to reverse awhile ago. Now it won't go into reverse. And now it gets upset with staying in gear. It appears that I need a new transmission. I think the tranny is a A340H. I've been reading through this forum and many posts are from a long time ago. There are plenty of people ready to take $1800 or more to rebuild my tranny. It seems that rebuilding trannies is an art. Asking for advice and guidance. I love my RV and want to have it for a long time. I feel I need to understand when and when not to use OD. And I think a transmission cooler is an important thing to have functioning. How can i get the longest life out of a rebulild? How do I find a transmission artist? I am not a Gearhead... please use regular human language 😎