a chevy chassis with a 7.4 would have the 4L80E transmission

there will be a speed sensor on either the tail-housing or the left side of
the main body of the transmission

I'd look over the connectors and wiring from the sensor toward the ECM

GM, on 'regular' trucks, used the same harness for 2WD / 4WD applications,
with an additional connector where they would hook up the proper harness for
2 / 4 wheel applications

also suspect would the sensor in the differential, if it has anti-lock
brakes, that sensor may be used for speedo data

the flex-wire from sensor to frame flexes every time the suspension does,
and is a weak point

I'd disconnect and spray every connector with WD-40 and re-assemble them

good luck on this one

=============="Marsh Monster" <SwampGrassProductionsStudio@webtv.net> wrote in message

Have you crawled under there to even take a look at the speedo assembly
that's on
the drivetrain?

"I F"......it's cable operated, then the situation should be going on
dry or wet.
===================¾nhogland@hotmail.com (Ben Hogland)
kicked ole Marsh in the balls and lectured
him with this message:

No, why do you assume that I know how it all works? I don't.

I gave a model year 2000 Chevy 7.4 and if you are not familiar with
that, thanks anyway. I was looking for specific advice.

So you don't know if it is cable operated or electronic operated??

Did you even read my message? I quote: "Is anyone familiar with the
2000 Chevy chassis and the way the speedometer system works enough to
understand what might be happening here?"

Obviously you don't fit into that category.
Ben
===================¾n,
 you overweight, too much time on yer hands,
bad attitude, lazy, waste of intellect.........

As far as assumptions.....
My first assumption was that you had'nt the
slightest clue as to how the simptom worked,
not that you did.....lard a.s.

Secondly.....
YES.... i did read yer pittifull cry for help and
understood the content.

Thirdly....
Carry yer sorry a.s to the RV forum with that
sh.t fer brains, holier than thou, I'm the f@#k'n
man, look at me now ....attitude of yers.
OR HAVE YOU BEEN BANNED??
(because you got a shitty attitude there Ben)

Fourthly.....

SUCK MY a.s!!!!!!!!
you overweight piece of sh.t.

As far as yer speedo problem......
your too fat to get under there to fix it anyways...so why even bother
asking.

HEY  B E N..........
 my light switch don't work in the living room.
Think I oughta see why....or go cry in the
forums for help first????  and kick anybody
in the balls that offers a suggestion???

~:~
MARSH MONSTER
~has to go to work now....at the tranny shop~
===========