LOL @ people who think ford puts governors on to keep you from speeding......
Do you realize why, in most cases, a governor is installed? Think about it, if motorcycles can be allowed to do 182 (governed @ that speed here in the states as agreed upon by all manufacturers capable of reaching/breaking that speed) why would Ford govern a truck at only 91???
Hmmmm.......well, maybe there is an engineering reason behind something like this....like preventing things like high frequency vibes that destroy components, drive shaft deflection, etc.
Trust me, I've seen test on drive train components @ OEM testing facilities....most times they govern a vehicle to keep it from destroying itself, not to regulate speed (you ever watch a drive shaft at 100 mph in slow mo?? Lets just say they're not straight anymore)
While actual vehicle speed is considered in most vehicles with governors, usually on trucks and some other cars it's installed to keep it from catastrophic failure at a high rate of speed (which could result in the possibility of a fatal accident = liability for the corporation)
And edit: agreed, your ranger doesn't need to go any faster than 91