2003 Chevrolet Silverado 2500LT Duramax
“The LB7 + Allison combo is basically a diesel legend.”
Documented Miles
344,000
on the odometer
Reliability Score
87/100
community rating
Est. Total Maintenance
$41,200
lifetime spend
Est. Savings vs. New
$30,800
vs. buying new
Engine
6.6L Duramax LB7 Diesel (V8)
Allison 1000 6-Speed
Drivetrain
4WD
2003 model year
The Duramax LB7 paired with the Allison 1000 transmission is one of the most respected diesel combinations ever put in a pickup. Phil's done two injector sets — the LB7's known weakness — and kept everything else stock.
Known Issues
We don't sugarcoat. Here's what to watch for — and what to fix before it becomes a problem.
LB7 Injector Failure
The LB7 injectors are internally cracked by design — they fail from the inside out. It will happen. Budget $2,000–$4,500 for a set. GM extended the warranty to 7yr/200k on some VINs. Do all 8 at once when you go in.