Compression Ignition Addict
Join Date: Jan 2012
Location: Fallon, Nv
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You're half way there, Greg. You were originally 9% fast, by going with 4.30s with 35s you are now 5% SLOW (speedo is indicating FASTER than truck is moving). I recommend downloading a GPS app for your droid to confirm my math.
Allowing for the .71 OD here are the rpms that your 6.0/TorqShift will turn at 70 mph ACTUAL, NOT INDICATED on 35s;
3.73:1801 (Karl's 03)
Now here's the part most people miss, the truck is programmed for 3.73s and 31.5 tires and it turns 1979 rpm@ 70 mph.
Back to IRONMOVER, 4.30/38 combo @ 70mph is turning 1890 rpm. Which put his truck the 5% off, but unlike Greg, he's 5% FAST. At 70 mph indicated, IRONMOVER is moving at 73.5, Greg is moving at 66.5, and Karl is moving at 76.3.
Karl and his 2003 6.0
Barefoot Accelerator Pedal
TRICO Force wiper blades
Yellow Military Aircraft Valve Stem Caps
Offensive "Stick Family" Decal
Big Ol'Honkin 1 1/4" Shank Receiver Hitch
WHAT!?! I was trying to list stuff that everyone else
hasn't already listed for their truck!
Last edited by Karls03; 01-20-2012 at 05:29 AM.