Sold
Pl. 1 of 24

Our read

GarageScout Take

The Flat Out Autos Jimmy conversion is what separates this Sierra: a regular-cab truck reworked into a short-bed, open-cabin configuration with a rear bench, backed by a Whipple-supercharged V8. At 333 miles it sits near the low end for this generation.

Strengths

  • Flat Out Autos Jimmy conversion based on a 2025 Sierra regular-cab 1500, with a shortened frame, opened cabin, and 5-foot-8-inch bed.
  • Whipple-supercharged 5.3-liter EcoTec V8 paired with the factory 10-speed automatic and dual-range transfer case.
  • White refinish with a removable color-matched bed cap, cream Katzkin leather with black piping, and custom Jimmy badging.
  • Built by Flat Out Autos, whose Jimmy conversion debuted at the 2022 SEMA show.

Watch For

  • The truck was refinished from its factory Thunderstorm Gray to white.
  • The frame and bed were shortened, and the cabin was opened to the bed and welded at the B-pillar as part of the conversion.
  • A non-matching spare tire is stored below the bed.