Yes you can run 20" wheels. As far as tires I would talk to a tire store or got to tire rack.com. They have a great feature on their website that allows you to see your truck with 20's on it and will give you tires sizes that will fit. This increase in wheel/tire size will change the speedometer in your truck.
2001 GMC Sierra 1500 SLT 4WD Extended Cab SB
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Car Customization
if 20's don't fit what size is recommend to give a four why drive look?
2003 GMC Sierra 1500 STD Standard Cab SB
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Car Customization
no lift kit, just want to know max tire size.
1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab SB
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Car Customization
Just purchased and truck has 3 different size tires.
1998 GMC Sierra 1500
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Car Customization
Can a 2012 GMC Sierra be leveled or raised without a lift kit ?
2012 GMC Sierra 1500 SLE Crew Cab 4WD
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Car Customization
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