The Stovebolt Site Forums The Parking Lot Big Bolts tops speed w/ aux transmission

I am looking at a 54 6400 that has a 4 seed with a 3 speed aux transmission. Was this a factory option? With the aux transmission what would be the truck top speed?

I think there was no Regular Production Option or Accessory auxiliary transmission for a 64xx series 1954 truck:

http://chevy.oldcarmanualproject.com/chevyresto/54117.htm
http://chevy.oldcarmanualproject.com/chevyresto/54163.htm
http://chevy.oldcarmanualproject.com/chevyresto/54156.htm
http://chevy.oldcarmanualproject.com/chevyresto/54133.htm

All depends on the ratio in the auxiliary transmission, as well as engine RPM, axle ratio, and tire diameter.
Some auxiliary transmissions are still 1:1 or direct drive in high, no increase in top speed. Others can have overdrive ratios up to about 0.73, other common ratios are about 0.85 and 0.80 plus or minus a little given different makes and models.

To calculate road speed input the values here.
http://www.onlineconversion.com/bigger_tires.htm
Put your auxiliary ratio in for the "transfer case" ratio.