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Thread Title:

485 vs. 550

Created On Monday May 17, 2010 16:11 Diesel Talk
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Posts: 1
Joined: May 2010

Note Monday May 17, 2010 16:11 View thread in raw text format
Diesel Talk
I am buying a New 2009 389 Pete, 18 speed and 46 rears. The truck has an ISX 485. I am wanting the dealer to turn it up to a 550, which I am willing to pay for. Cummins says I doesn`t need it because the 485 and the 550 both have 1850 lbs of torque and I wouldn`t see a difference. They also say there may be a warranty issue. I haul in the mountains and now have a 2005 Pete with a 550 Cat. I hear great things about the ISX but want all the pulling power I can get but, I don`t want to hurt the motor. Should I have it turned up or will the 485 have enough. I would like to hear form someone who has driven both or at least had one turned up. Thanks
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