From: Glenn Shaw (wolf.star@verizon.net)
Date: Wed Oct 15 2003 - 12:03:27 PDT
Hi
I would state that there is no sucking up of fluid problem from
Humvees/hummers either from fording system components or broken transfer
case coolers. What happens is the transmission fluid heat exchanger
within the transfer case sometimes cracks and allows fluid pumping under
pressure from the transmission cooling system circuit, to pump into the
transfer case, causing it to overflow, sometimes into the vent system.
Speed does not seem to be a factor as a prime cause. The truck will do
73 at max governor setting. 60-65 is a good maximum speed when you have
to travel that fast such as on an interstate. 55 is nice if you can do
it. Mark is right about getting a truck that has the 4L80E OD
transmission if you need to drive fast.
Glenn Shaw
MTANJ
MVPA
-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On
Behalf Of Mark J. Blair
Sent: Wednesday, October 15, 2003 1:50 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] Hmmwv
alex gordon wrote:
> # 2 I have heard all the rumors about driving over 55 mph and sucking
up
> all of the fluids because of the fording kit.
If I'm not mistaken, the fluid sucking occurs when the heat exchanger in
the
transfer case breaks, allowing the transmission to suck out fluid from
the
transfer case (or does it pump fluid in? I don't remember). Because the
fording system plumbs most of the vents together, the resulting fluid
overflow
in one case or the other results in fluid ending up in other places,
such as
the air filter. I don't think that the "vampire" condition is related to
how
fast you drive.
Personally, I try to drive under 60 MPH in my HMMWV, even though it will
go a
bit faster than that. If you want to drive a HMMWV much faster than
that, you
might be better off with a newer model with the 4L80E 4-speed overdrive
tranny
and the 6.5L turbocharged engine.
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