Tracking Down Parts
New engines and transmissions are available directly from any GM dealer. If you're resourceful, you may find a used Duramax diesel engine, Allison transmission, and even an occasional complete conversion package on eBay. It's also possible to locate good used individual parts through a salvage center, or you can buy a complete salvage vehicle, which would contain all the factory components needed for a conversion project.
This is how it all started. The 1989 Silverado is shown here in original condition, and the Duramax and Allison have just arrived.
Aside from the new dash, the interior was updated with 1995 Suburban six-way power lumbar leather seats and console. Graphite carpet was laid, a gray headliner was installed, and all interior trim panels were painted to match.
This is a purpose-built truck--it's not built to tow or haul, but to allow the Duramax and Allison to perform to their full potential. Compared with the original 5.7-liter gas engine, the new powerplant has up to three times the power, twice the fuel economy, and lower emissions.