Any advice on getting a core trans to rebuild?
One with good gearing already that I can rebuild and prepare to drop in?
The 91 up's in Cadillac and 92 up in most all other 4T60E cars were "E" trans, electronic controlled.
Can a 4T65E fit and work? If not, why?
If not, what will make a 4T60E survive harder life? I want it to last forever....
I am not abusive to my cars, but would prefer better gearing

. I know I can change the link chain gears to 35/35 or 33/37 and not change the diff and get better gearing. The Deville Touring Sedan has the 35/35 ratio. So the final drive being 2.73, but the engine is not overdriving the trans BEFORE it gets to the final drive. (Tip on internal gearing was from a GM Dealer who had a trans guy on staff who rebuilt them in house, dealer was Buick dealer in Colorado Springs on Motor City Drive)
Ideally I would like around 3.33 or 3.73 gears. I spend 90% of my driving from 40 to 60 mph. So having those gears would make it a dream to drive.
Tom