Yes it is.

Torque = radial force.  
Work = force applied over a distance- in this case, work = force applied
over engine revolution (distance)
Power = work applied over time.

t= torque
r = radius
f = force
d = distance
p = power

t = f * r   f = t/r
w = f * d
p = w/time =  (f*d) / time

Linear distance is d = 2*pi*r distance per revolution

p =   f   *          d              / time
p = (t/r) * (revolutions * 2*pi*r)  / time)

= t * 2*pi * revolutions / time
 = torque * 2*pi * (rotational velocity)

plugging in conversion units;

1 HP = 33,000 ft-lb/min

HP = torque * 2 * pi * RPM / 33,000

which equates to the familiar:

HP = torque * RPM / 5252

Your points are well noted. Back 25 to 30 years ago and more we did
not have the benifit of OD in SUV's so when you had a 4.10 or deeper
for towing power you had engine cranking going down the road on
highway even when unloaded but today OD changes that and you can have
a 4.56 with a 2100 to 2300 RPM cruise in OD at 65 MPH depending on
tire size in a big SUV. ANother part of the problem is detriot is
making impressive HP rating on smaller engines at the expense of low
and mid range power. It is no big trick to get a high HP rating out of
a small engine. You simply move the torque peak to a higher RPM and
since HP is bascially torque times RPM you get more HP. But, there is
no free lunch because when doing this you loose lower RPM towing power
where you need it most. Idealy for a good gas tow motoer you want a
torque peak by about 3000 RPM or sooner for a few reasons. One is
better lower RPM response and power and the other is better efficeny.
A gas motro uses the least amount of fuel per HP hour produced while
working hard when it is at or very near its torque peak (as its peak
VE or Volumetric Efficency) If you engine peaks its torque at 3700 RPM
or more and you are towing at 2500 RPM and pulling hard performance
and MPG is going to lack a lot and when you hit a hill and RPM drops
it will loose more torque as RPM drops. With a diesel it reaches peak
VE as a much lower RPM (typically 1500 to 2000 RPM) so it you tow at
say 2200 RPM and hit a hill as RPM try to drop you are also gain a bit
of torque rather than loosing it. A big block gas motor has more
displacement and peaks its torque and HP usually at about 1000 RPM
less so it has more usealble power to tow with even if it has a lower
HP rating (example, a 300 HP GM 8.1 will waste a 310 HP 5.3 towing
badly or the old discontinued Dodge truck V10 will likewise waste a
higher rated Hemi and same with a old 460 vs a 5.4). Since these
engine as eithe now gone or soon to be gone the next best optiion is
to regears trucks to make better use of availible power. A 5.4 with a
5.4 and a 4.56 or 4.88 and a OD would be a impressive tower and get
reasonable MPG too (better than a V10 likely) and for a lot less total
cost than a PS too. Not to mention the surprized looks you will get
when someone finds that you are towing so well with a smaller motor
too!  Example, if you had say a 4.88 with a 5.4 on a hard pul on a
hill in drive at 65 MPH you would be truning about 3500 RPM which is
close to torque peak and it will put up a good fight plus tranny will
be a in a 1 to1 transfer mode and to be passing power through with
lowest possible internal power loss because no redution units are
active. Then when pull is over you select OD and cruise at 2400 to
2500 RPM which is nothing for a 5.4.
-----------------
TheSnoMan.com

Sure.  It was available in the F250HD.

It's an oddball . Manufacturer date is 11/97 and every time I order
something for it (like the air filter) it is wrong. The original
sticker is still on the valvecover.