Asked by Jul 24, 2016 at 03:39 PM about the 2005 GMC Sierra 1500 SLT Crew Cab SB

Question type: Maintenance & Repair

By the end of the week I will have 315,000
on my 05 Seirra yes 315 great truck looks
good but starting to smoke.
A buddy has a 6.0 in good shape will
everything bolt up. What will happen to gas
mileage can the drivetrain handle the 6.0.
This is a 1/2 ton 2 wheel drive on the
interstate a lot no trailer

2 Answers


Not really an answer to your question but if it only smokes at idle that's valve guide seals. Not a terribly expensive fix. A lot less hassle then swapping out the engine. Just a thought. HTH. -Jim


Jim thanks went through that believe it's a piston ring

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