The engine lugging is, taller than stock tires
& tall rear gears, for super-speedways
From what I've read
yes they used 3 speeds in many of them
(3.09:1 1st gear stock in a production a833 3 speed,
they may/I assume they have a different gear in it)
1st is to take off only, they are in high gear mostly
unless it's a road course & all the variable/gear ratios etc.
even # of gears, are different, they ran steeper gears & trans ratios
Takes about a 3.00:1 gear ratio
with a final 1:1 3rd gear (or 1:1 4th gear)
to run just over 7,500+ RPM @ 210 MPH on the straight aways
with just over a 28" diameter tire
with the engine locked up 1:1 with no slippage
a 3.54:1 would be
7,500rpm
with a 28" tall tire
1:1 trans ratio,
is like 176+mph,
that 3.54:1 ratio/s it would be like almost 9,000 RPM at 210
or take a 33" tall tire to do it with a 3.54:1 gear & at around 7,500+
those Good Year tires they used aren't 33", more like 28"-ish
check it out on wallace racing calcs