I have a 2004 Chevy Avalanche 2500. 4x4, 8.1 ltr.
Yesterday had all tires replaced, and alignment done.
Today, (first I've really driven the truck since having the work done) on my way to work, running down freeway ~65-70mph, I glance down at the gauges, and my Tach is reading 6000 rpm. Now, I know I would have noticed this just by the sound of the motor, but it still freaked me out. Stopped at a stop light, motor is idling just fine, everything is normal, but Tach is reading 4000 at idle.
Truck shifts as normal when accelerating. Turn truck off, and Tach remains reading at 4000.
All other gauges are right where they should be. (oil temp, trans temp, etc...)
So for you mechanical gurus, what is causing this, and how do I fix it?
Seems like this should be something fairly simple.
I certainly don't think the tires and alignment would have anything to do with this, but I wanted to mention it so as not to leave any info out.