Thanks Guys!
Crenwelge, your photo link does not work.
I found the parts ID tag in the glovebox; It says the truck has a 2342483 rear axle and a Clark 205V 5DD transmission.
The top speed isn't a real issue since the speed limit for trucks is 50 mph overhere. But in the future I would like to run this speed at lower RPM's so is there a possibility to regear this axle?
