I have 1990 reatta with the 4t60 tranny. My family has had nothing but trouble with these transmissions, My father and uncles 88 and 89 olds both had failures and sisters 91 lumina but no one worse than me and my reatta. This tranny has been rebuilt twice in the last 10k and needs to be rebuilt again. On the other hand my brother has had good luck with his pontiac with the 4t60e. Could I swap a 91 reatta cpu for mine and then could I go with the electronic tranny? As far as I know the only difference in the years was the tranny. Or is there so other way to swap for the electronic trans.?