RE: [MV] CUCV Transmission problems

From: Stu Ellis (stuinnh@attbi.com)
Date: Mon Jun 16 2003 - 12:38:15 PDT


I have been told by my trans guy and a few Motorpool sarge's that heat
and/or a bad modulator destroys the TH400. I put NOS trans in my
1009 along with a big cooler. If you tow or carry heavy loads be sure
to put in a cooler.

Stu Ellis

-----Original Message-----
From: Military Vehicles Mailing List [mailto:mil-veh@mil-veh.org] On
Behalf Of David Cole
Sent: Monday, June 16, 2003 12:14 PM
To: Military Vehicles Mailing List
Subject: Re: [MV] CUCV Transmission problems

I've rebuilt Turbo 400's before. They really aren't that hard to
overhaul
and repair as they only have 3 speeds.

First, get a manual. I had one checked out of the local public library
that covered the 400 from top to bottom, rebuilding, hot rodding,
racing,
etc. It was very good. I think it was an HP book.

For what you want to do, just go with heavy duty disks and steels. You
could buy the really expensive stuff, but I think you'd be throwing your

money away.

If is more important to find out why your tranny is failing. I suspect
that after it failed initially, they didn't get the transmission
adequately
cleaned out of metal particles and it is screwing again. If the first
failure was really bad, and scattered metal throughout the tranny, you
really want to flush the case hydraulic circuits out really well.

I once blew the sprag in a turbo 400 by shifting into reverse at about
5000
rpm and 80 mph with the throttle at WOT. (You can do weird things when
the
throttle sticks at WOT! The carb return spring went over-center and
actually held the carb WO) It didn't immediately fail even after that.
It
took about 1000 more miles before it started to slip badly and that was
after some hard use with a 400 hp engine.

Dave

On Thu, 12 Jun 2003 17:06:36 -0700, Nathan Wilkens
<nathan.wilkens@asu.edu>
wrote:

> Esteemed Colleagues,
>
> It looks like my 86 M1009 has eaten her third transmission within one
and
> half years. Of course, I find this to be extremely amazing,
considering
> that the TH400 is supposed to be a darn good transmission. I've also
had
> my
> CUCV in perfect adjustment with shift points, vacuum pressure, etc, so

> that
> wear should have been minimized on the transmission. I should also
add
> that
> I've only put 15,000 miles on her in the last year and a half, so I've

> not
> worn the transmission out.
>
> I'm going to have to do this rebuild myself (no else seems to be able
to
> get
> it right) - and I was considering rebuilding with a performance kit.
Has
> anyone tried this? Does anyone have rebuild kit recommendations? Is
> there
> anything I should know before diving into a project like this (other
than
> the obvious - 'how do I do it?').
>
> I'm a bit pressed for time on this rebuild, since I need my 'baby'
back
> in
> good health for a three weeks of off-roading near Moab Utah in July
(can
> you
> believe it? I'm actually getting paid to do that!).
>
> Thanks,
> Nathan Wilkens
>
>
>
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-- 
Dave

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