Not a question that is answerable.
The 21 speed spicer was available in the 1970's and 80s.
There have been variations of the "21" speed box since the first Heavy truck hit the high way.
Semi trucks and cars
Speed is controlled by the ECU.
The Occupational Health and Safety Administration, or OSHA, does not set definite speed limits for lift trucks. However, speed zones dictate that the average speed limit for lift trucks is 4 miles per hour.
Rat rods are not installed on trucks. It is a barebones car built for speed and racing.
speed demons of course
probably 8 or more
55 miles
Yes
50 mph + over
6-speed automatic. Technically 5 speed with overdrive
Most of their trucks will have a 9C (convertible to 13 speed) or ten speed transmission. A limited number of their trucks will have 13 speeds, and these are typically used for pulling Rocky Mountain Doubles or the over-dimension Costco trailers.
60