Tire size
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Joined: Jul 2010
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From: Media PA
Nope, You can actually run the same sized tires (overall height) on a 18" rim as what came on it's stock 16"s, that's what came on my 18"s when I bought them. I've now upgraded to 35"s with 4.88 gears, haven't recalibrated the speedo yet but I know the offset based on GPS speed and miles.
Post Fiend
Joined: Feb 2011
Posts: 26,410
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From: Ft. Lauderdale, FL
Don't know what size tire your going with but my Hyperpac will only let me program upto 33.5" anything over and my truck won't start and hyperpac will show an error.
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From: Media PA
I documented this on the way home with the new rubber when I bought the Nitto Duras, they are 305/70R18E specced to be 35.28" tall, rear gears are 4.88.
Speed verified by GPS on a flat level stretch of I-495 in DE and RPMs were taken from the Ultra-Guage's digital display;
50 MPH = 1720 RPM
55 MPH = 1900 RPM
60 MPH = 2055 RPM
65 MPH = 2230 RPM
70 MPH = 2408 RPM
75 MPH = 2580 RPM
Post Fiend
Joined: Feb 2011
Posts: 26,410
Likes: 6
From: Ft. Lauderdale, FL
I documented this on the way home with the new rubber when I bought the Nitto Duras, they are 305/70R18E specced to be 35.28" tall, rear gears are 4.88.
Speed verified by GPS on a flat level stretch of I-495 in DE and RPMs were taken from the Ultra-Guage's digital display;
50 MPH = 1720 RPM
55 MPH = 1900 RPM
60 MPH = 2055 RPM
65 MPH = 2230 RPM
70 MPH = 2408 RPM
75 MPH = 2580 RPM
Speed verified by GPS on a flat level stretch of I-495 in DE and RPMs were taken from the Ultra-Guage's digital display;
50 MPH = 1720 RPM
55 MPH = 1900 RPM
60 MPH = 2055 RPM
65 MPH = 2230 RPM
70 MPH = 2408 RPM
75 MPH = 2580 RPM
Moderator
Joined: Jul 2010
Posts: 12,049
Likes: 1,546
From: Media PA
For our situation and usage that's all that really matters Michael, Everything that I've done to the Ex has been directed toward making it a better tow rig!
The old 32" tires at 65 MPH had the motor turning at 2430 RPMs, beast mode!
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MTman
1994.5 - 1997 7.3L Power Stroke Diesel
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