well after 150,000 miles on my stock,4l60e it's not shifting from 2nd to 3rd and from 3rd to drive. so i'm going to assume it's done and is time for a new one. what do go a with ? factory brand new rebuilt ? custom built ? something a little bit stronger fro towing. i don't race drag or anything like that , just a daily driver with some towing

also i live in orange county california so any recommendations for a trans shop out here would be apprecitated.

thanks,