DURAMAX DIESEL CONVERSION
Hello,
I am gathering information about a Duramax diesel conversion. I currently own a 1994 Chevy K3500 dually crew cab with 4 full size doors. It has the BB 454 gas engine and the 4L80-E automatic transmission. I can pull just about any trailer weighing up to about 15,000-lbs, but the MPG is not very good. Will this conversion work with my vehicle? And what is the approximate cost of one of these conversions? I have read different places that I should uses a LB7 and the Allison 1000. I can find them used and know that the motors, if taken care of, will last forever. Any information would be greatly appreciated. I would like to keep my current truck, but upgrade the internals, and I believe this is the way to go.
Thanks again. Jarred Degraw Via Email Hi Jarred,
GM added more "stuff" to the top of the Duramax as the model years progressed, making the hood clearance in an earlier 1990s body style installation more of a challenge when using a newer or more current Duramax engine. The earliest Duramax, the LB7, "just" fits without a body lift or hood modifications. However, an aftermarket steel cowl induction hood would allow you to modify the internal hood structure to give you another 3-4 inches of hood clearance – plenty for an LBZ, LMM, LML, or even the very latest Duramax. Also, a 1" body lift would also be a help in providing more hood clearance and provide a nearly ideal fan centering in the fan shroud.
The cost of a conversion depends on two main factors: 1- The newness/completeness/condition of the donor package. 2Who is providing the labor.
I know of conversions costing less than $5,000 and some that cost more than $20,000. I know of conversions taking 6 months or more of spare time and I know of pro mechanics (who have done one before) who can turn one around in 2 weeks.
The choice in engine package should be made by evaluating the "deal" you can make for the complete package – when considering condition, completeness of package and of course price. A conversion is easier when you obtain a complete salvage truck that has everything you need. The cost for the bits and pieces really add up when bought at retail. I recommend installing a steering column assembly matching the model year of your Duramax/allison, and modifying your existing dash to accept the newer Duramax matching instrument panel gauge cluster. .5L Trouble Codes