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Discussion Starter · #1 ·
howdy folks, the tired 4.8 and 4l60 in my 03 sierra is looking mighty fine for a drivetrain swap, what does it realistically take to do a gen 4 swap with a 6l80/6l90 and to be able to have someone who doesn't know anything about the truck feel like its a regular truck? I'm so sick and tired of 4l60's and 4l80 trucks i drove my buddies single cab 5.3 with the 6 speed and it was such a better driving experience than a 4 speed the shifting feels so much smoother and the gearing is so much more aggressive its such a better upgrade in every single way.
 
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