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Re: 4L60E or 4L80E Transmission?
Don't forget the difference in gear ratio - the 60 has a deeper first gear and a taller OD. That means faster take off and a better cruise RPM. The fact that it is 75 lbs lighter and easier to package is a big deal and I think Trailblazer SS 400hp engines have 60's behind them from the factory. I know it's not an 80.
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