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.
Speed is controlled by the ECU.
Semi trucks and cars
Rat rods are not installed on trucks. It is a barebones car built for speed and racing.
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.
speed demons of course
probably 8 or more
50 mph + over
Yes
55 miles
6-speed automatic. Technically 5 speed with overdrive
tensor magnesiam trucks
18 for cars, 21 for trucks