Injected79
New member
Hey guys, I bought a blown up 2004 6.0 a little while back, Long story short i wasnt able to drive the truck pior to buying it. Now its all back together, lifted on 35" tires. I got it out yesterday for the first time and the speedo is 15 to 20 mph at 40 mph by my gps. IF the speedo reads 45 to 50 then im running around 80 by the gps.
The truck had a noise in it, i found the rear pinion was loose, at this time i dissassembled the rear diff to inspect everything, only other damaged i seen was the case of the carrier had some cuts in it looking like it came from the pinion. I tightened the pinion back up, noise is gone but speedo is still no where close. While i was there i cleaned the speed sensor up checked bearing and so on.
Now on to the next step. I got tunes from Matt for the truck, and iv been going through the adjustments on the sct, i have programmed it with stock tires up to the biggest tires it offers on the tuner at 505 revs per mile with no difference. So i also tried the gear ratio adjustments, from a 3.08 gear up to a 5.13 gear with the same results. I have AE software, and the speedo is reading the same on the dash as what the software is picking up on the computer. This tells me the dash cluster is ok, and the speed sensor is working.
Any ideas on where to go from here?
The truck had a noise in it, i found the rear pinion was loose, at this time i dissassembled the rear diff to inspect everything, only other damaged i seen was the case of the carrier had some cuts in it looking like it came from the pinion. I tightened the pinion back up, noise is gone but speedo is still no where close. While i was there i cleaned the speed sensor up checked bearing and so on.
Now on to the next step. I got tunes from Matt for the truck, and iv been going through the adjustments on the sct, i have programmed it with stock tires up to the biggest tires it offers on the tuner at 505 revs per mile with no difference. So i also tried the gear ratio adjustments, from a 3.08 gear up to a 5.13 gear with the same results. I have AE software, and the speedo is reading the same on the dash as what the software is picking up on the computer. This tells me the dash cluster is ok, and the speed sensor is working.
Any ideas on where to go from here?