6-Speed Duramax: 2003 Chevrolet Silverado 2500 HD

The Silverado name first appeared on the side of a Chevy pickup in 1999 on the replacement for the 75-98 Chevrolet C/K pickup, but there were two different versions of the Silverado. The first is a light duty version that could be purchased in 1500 and 2500 versions, but there was heavy duty version that was sold as the 1500HD, 2500HD and 3500HD -- and the HD was the only way to get the boosted Duramax diesel torque machine mated to a 6-speed manual gearbox.  Find this 2003 Chevrolet Silverado 2500 HD offered for $5,500 in Daleville, IN via craigslist.

15k: Turbo Diesel: 2004 Chevrolet Suburban DMAX Swap

The Duramax V8 turbo diesel engine was built from a joint venture between General Motors on Isuzu starting in 2001.  The DMax is a heavy duty engine and was only available in the H1 Hummer, GMC Sierra/Savanna/Topkick or Chevy Silverado/Kodiak/Express.  It never made it into Chevrolet's Suburban people hauler, but it does fit if you give it the chance.  Find this 2004 Chevrolet Suburban DMAX Swap currently bidding for $14,000 with a few hours to go.