US Gear makes auxilliary transmisions that might be helpful. There are
popular amongst RV'ers that tow heavy. I don't know the URL but a Google
search should reveal their website. They might have a solution to your
If you research them you will find that not only are they pricey but
they also use hyd clutchs for OD and underdrive and since there is no
external pump on them that means that you are going to have to be
turning some drive shaft RPM's to run the pump in it to shift it which
means under drive will not be avaible for startout so this is not
good. Also they recommand 5000 mile oil change intervals which means
it is not a install and forget unit.
US Gear does not list a underdrive option. Given today vehicles that
all have OD and generally taller axle ratios, they should offer a
underdrive option rather than OD only. I question the value of a aux
OD unit for towing gear splitter plus it would tend to increase strain
on main tranny on hard pulls rather than decrease it.
Are you blind, stupid, or a combination of both? On the very link I gave
you (I'll repeat it in case you missed it the first time)
What's the second bullet in the gray box in the middle? "Available as
Underdrive or Overdrive"
From their first paragraph on that same page:
"It is for this reason that US Gear offers TWO DIFFERENT AUXILIARY
TRANSMISSIONS; AN UNDERDRIVE UNIT OR AN OVERDRIVE UNIT, MADE IN AMERICA"
Now... do you want to keep telling me how I'm wrong, and US Gear only makes
an overdrive unit?
I've got a GearVendors, my second one. You are incorrect, GearVendors only
CALL it under drive. You have to think of second over as third under to
justify that terminology. I can't quite wrap my mind around that
terminology. Without a first under drive...well...I can't get there from
here. The US Gear IS a true underdrive unit and could be a help to Nate if
he decides to go that way.
In all seriousness, an FL50 would make a nice hauler for that 5th wheel.
The only problem is, that's ALL it's good for - whereas the pickup can serve
double/triple-duty as a hauler, a work truck, and a people mover.
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