Here's the situation, A local guy is selling a 2000 gmc 6500 series with the Allison auto. Its got approx. 135000 miles. It looks like it was well taken care of. What do the experts think of this engine. Its just a cab chassis. If I buy it, I would probably install a 10 foot godwin dump. I have a few 1 tonne's. By the way, the truck is equipped with airbrakes. I currently don't have a cdl, so this truck would be strictly a hauler. No trailer. Its rated @ 26000 gvw. Thanks guys for your help.