bigger tires, now down on power?

bigger tires, now down on power?

06-21-2009, 07:04 PM

#1 (permalink)

SSell

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Join Date: Feb 2006 Posts: 104

bigger tires, now down on power?

Need some opinions----went from 265/70's to 285/70's before last week's camping trip. Previous trips to same same place (7000 ft/ mountain grades) my truck had no problem holding 60-65 MPH uphill pulling my 24' toyhauler (call it 10,000lbs). This time was struggling to do 45, pedal on the floor, tranny selector in drive (3), tow/haul mode on. Tach would sit just above 2,000 rpm. Just flat, no extra power, no acceleration. Shifting into (2), tach jumps to nearly redline, but truck would slowly accelerate to 50-55MPH. Stock truck, not reflashed for new tire size. Don't think its a tranny problem, not running hot, seemed to run fine when I charged up smaller hills. How critical is it to update for tire size? Used to have 325/60/18's on it and ran fine... Any Ideas?

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'05 3500 QC CTD 4x4, 48RE, LB, SRW, level kit, TorkLift camper kit

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