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For the record, my 8.1 truck back in the day got about 11mpg. My 2019 Silverado 5.3 gets about 16.5 on 34” tires and 3.54 gears, but I rarely see a freeway—almost all rolling backroads. My CUCV with a vortec 5.7 and sniper EFI/timing control with a th400/3.73s got almost 15mpg. When complete...

I’m kind of a hillbilly. I took the concepts of insulation and applied them in my own way after priming and painting with rattle cans. Lizard skin is a product that is latex based with micro beads in it. The micro beads have been used in the aircraft industry for years, so I bought a few pounds...

Putting a 12v in front of a th400 or even a 4l80 is going to kill the tranny. If you aren’t towing a ton, or driving 30k a year. I’d do a gm gas engine. If you choose to keep the th400, you’ll need to adjust or swap your vacuum regulator and put the correct governor springs in it. Without...