5spd surprise

[rwoodysurplus]

i have the 5 spd model in my f-800 with 8.3 c cummins and i have yet
to use the low gear. Its a tractor with a 38' trailer to haul heavy
stuff up to 58,000 but have yet to need the low gear and it has to
be selected to use low..Its not used in the d postion.


woody 81 fc looking for 8.3/world series 4000 for my bus~

--- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
<MHOHNSTEIN@...> wrote:
>
> Jeff, I talked to Lennie my Allison guy and he said the 654CR was
used in concrete trucks, had larger diameter converter 3" longer
input shaft and larger diameter stator support spline. He scratched
his head a little and allowed it might be possible to retro the 643
input, stator support and converter to use the 5sp. planetary. I
can believe it was done as the engine has been turbo charged,
previous owner living in the mountains might have gotten weary
talking to the joggers on the grades.
> MH
> ----- Original Message -----
> From: Jeff Miller
> To: WanderlodgeForum@yahoogroups.com
> Sent: Friday, March 24, 2006 10:02 AM
> Subject: [WanderlodgeForum] Re: 5spd surprise
>
>
> Trust Mike on this one. The MT-643 is the FC transmission
until '87,
> the torque-converter does indeed feel like a shift, should be
around
> 40mph at full throttle. The 654 was used, on the 6V2TA Detroit
in the
> PT, not on the FC. The transmission that would fit your coach in
a 5-
> speed would be the MT-653, which is the MT-643 with a creeper
first
> added, dump-truck tranny. I'm not aware of that transmission
ever
> being installed in an FC nor do I know why you'd need a creeper
gear.
>
> 10mpg is seller's math. You should get around 8, less if you
push it
> hard. I've owned all configurations of diesel FC, never had one
that
> averaged better than 8.5 nor worse than 7.5mpg. If you have the
> original 5.29:1 gearing you're pretty far out of the BSFE curve
> already at 60, running 50-55 gently might give you 9mpg. The NA
has
> to work pretty hard to push an '82 FC35 down the highway, worst
> power/weight ratio FC made and geared for 55mph. On the other
hand,
> 8mpg isn't bad compared to the earlier gas models that weighed
> 10,000lbs less.
>
> Pull the sending unit for the fuel tank, replace it while you're
at
> it, they go bad, then calibrate it for the tank. Sounds like
yours
> was replaced without calibration. The '82 FC35 side-bath should
hold
> 265gallons.
>
> - Jeff Miller
> in Holland, MI
>
>
> --- In WanderlodgeForum@yahoogroups.com, "davidkerryedwards"
> wrote:
> >
> > It's possible I'm feeling convertor lock up, but I doubt it.
There
> > are 4 clear upshifts after 1st and 4 clear downshifts from top
gear.
> > Does a lock up convertor unlock under load on a hill, giving
the
> > appearance of a downshift? The amount of rpm difference is
more
> than
> > I would associate with a lock up. There is paperwork in the
owner's
> > manual indicating it it an MT 654CR transmission, which is a 5
> spd. I
> > haven't crawled underneath to confirm yet. Where is the model
> number
> > on the transmission?
> >
> > Kerry
> > 82 FC 35
> > Denver
> >
> > --- In WanderlodgeForum@yahoogroups.com, "Mike Hohnstein"
> > <MHOHNSTEIN@> wrote:
> > >
> > > You are feeling the converter lock, it's not a gear change.
You
> > have a 643, 4 speed with lock up, you will get about 7/8 mpg
and
> > that's the way it is. Don't believe the gages, they are
indicators
> > and not to be taken literally.
> > > Let mine get down to indicated quarter tank once and it took
145
> > gallons, 150 tank, rear bath floor plan.
> > > MH
> > > ----- Original Message -----
> > > From: davidkerryedwards
> > > To: WanderlodgeForum@yahoogroups.com
> > > Sent: Thursday, March 23, 2006 11:21 PM
> > > Subject: [WanderlodgeForum] 5spd surprise
> > >
> > >
> > > Took my Bird for it's first cruise from Denver to Amarillo
to
> visit
> > > Palo Duro Canyon and Alibates Flint Quarries. After first
> thinking I
> > > was just losing my mind and not paying close enough
attention to
> > > shifting patterns as we climbed hills, I carefully counted
the
> shifts.
> > > It has a 5 spd transmission and not a 4 spd. What a
pleaant
> > > surprise. The Allison 5 spd has a lockup torque convertor
> which means
> > > the previous owners insistence that it got a steady 10mpg
is
> > > believable. This means that not only does it have a new
motor,
> it has
> > > a new transmission. Discovering this made up for the fact
that
> > > Amarillo had record low temperatures and snow during our
visit.
> > > Fuel gauge is reading way past full. Is this typical? It
> seems to be
> > > working, just that full is past full, and even past the
little
> button
> > > below the 'F'. If it does this, does 'E' still mean empty
or
> is empty
> > > now 1/2?
> > >
> > > Kerry
> > > 82 FC 35
> > > Denver
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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