Diesel Conversions

Eco-Friendly Power - You can now have great fuel mileage, low emissions, and tons of horsepower as developed by the man who started it all! Johnathan Goodwin and his company H-Line Conversions, Inc. pioneered "The Conversion" of the H1 and H2 Hummers from gasoline, 325 … read more

Do-It-Yourself Diesel Conversion Kit

Do it yourself and save thousands!  As seen on KAKE TV News July 12, 2012: Finally, a kit to convert your Hummer yourself to the legendary Duramax diesel. This kit consist of all components, except, for the drive train, which can be purchased separately. With over 15 year… read more

Hybrid-Electric Kit

The Patented Goodwin Assist is a revolutionary new technology for converting Hummers into highly fuel efficient plug in hybrids. The Goodwin Assist is focused squarely on bang for the buck proposition of maximizing fuel savings with minimal capital investment resulting in the short… read more