That is interesting,
I believe on the 1954 Chevy car, the pedals came up through the floor.
On the 1955 Chevy car the pedals are hanging from the firewall/dash.
Sounds like the Chevy truck engineering department was lagging behind the car engineering department.
According to your reply the truck clutch/brake pedals did not transition from floor to firewall/dash until 1960,
where as the car transitioned from floor to firewall/dash in 1955.
It took the Chevy truck engineering department 5 years to get on the firewall/dash band wagon.
This doesn't mean the truck engineering department was "lagging behind". There could be several reasons for this. Foremost is probably that it was easier to access on a truck than a car below the floor, and it was unnecessary to change until 1960. That's my guess.
Most of the time when these changes weren't implemented it was a business/cost decision. Remember that trucks used to be purely workhorses.
