clthorn
Newbie
I have a 1998 C3500 with a 4l80e, 4.10 and 245/75/16 tires. Now with all that when I'm cruising at 3000 rpms I should be going about 88mph right?!
No I'm going 70mph. I have verified that I am in 4th gear and the torque converter is in lockup. I'm 100% positive I have 4.10 gears. My speedometer reads incorrect I have verified this with gps. Below is a photo of me driving 70mph but if you input all the information into Spicers ring and pinion calculator I should be going 88mph at 3000rpm just like the speedometer says but I'm only going 70mph at 3000rpm for some odd reason please help
No I'm going 70mph. I have verified that I am in 4th gear and the torque converter is in lockup. I'm 100% positive I have 4.10 gears. My speedometer reads incorrect I have verified this with gps. Below is a photo of me driving 70mph but if you input all the information into Spicers ring and pinion calculator I should be going 88mph at 3000rpm just like the speedometer says but I'm only going 70mph at 3000rpm for some odd reason please help