Welcome to the forum
It sounds like you need a 4L80E trans. That will help drop some rpm's with what is likely 3.73 rear gears. Of course the other option is a rear gear swap.
Quote:
Originally Posted by Jensen Handcrafted
Here is my new project. Originally purchased at Joplin Chevrolet (either in/or delivered to), Cashmere, WA. 2nd owner, came with window sticker and an incredible amount of maintenance documentation. Solid bones, excited to get started... Working on improving the mpg first. The original owner did an engine/trans swap to a 454/TH400.
Cheers!
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