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Man, that'd be nice.
The 4L70e has the same exterior case as the 4L60/65. I tried to get the dealership to install one of these but they would have had to swap the output shaft I believe... needless to say the assholes at Lithia Chevrolet of South Anchorage are a worthless pile of shit & kept on telling me a 4L70e wouldn't fit. If they had bothered to do a 5min google search (other than listening to me), they would have seen I was right.why not a built 4l60e? smaller/lighter and the there's corvettes in the 9's and 10's running them.
also yes you'd have to relocate the crossmember on the 6l80e and the 4l80, the 4l70e could possibly fit but more than likely you'd have to relocate.
Contact these guy's:Current Performance Wiring LT1, LT4, LS1, LS2, LS7 Engine Wiring Systems
They were the first and only company to put a 6l80e in a colorado. They had it 100% but the owner of the truck wanted a 4l80e.
but also for high hp applications nobody really has a grasp on them. the 60 and the 80e are obvious choices for them. Course if your going all out more than likely a 80e would be the best choice.Better gearing in the 6-speed, it keeps the engine in it's power band better and has 2 overdrives for highway mileage.