From: Steve & Jeanne Keith (cckw@attbi.com)
Date: Wed Oct 23 2002 - 03:54:26 PDT
If you didn't jack up the other rear axle, you cannot rotate one rear wheel
with only one
side of one axle jacked up. The back end on the CCKW, M5H6 and M35 et. al.
are in
8 wheel drive all the time in the rear. Jacking only one of the 4 rear
positions (wheels) will
NOT allow that position to turn because one position on the other rear axle
has to turn the
same amount.
This is why I tell people to put a matched set of tires on the rear and
LEAVE THEM ALONE!
The rears on my CCKW will last ~30,000 miles. The front ~4,000-5,000. If I
rotate the fronts
to the rear, I will be creating an imbalance in the diameter and cause great
strain on the power train.
My CCKW has a matched new set on the outsides and the innner ones are older
and smaller. Last
year, I was driving on a smooth highway and commented to my wife that either
something was
seriously wrong with the truck OR I had a flat on an outside tire. I could
hear the straining in the
power train. I had a flat and so it was riding on the smaller innner tire
causing binding.
Now if you have a sprag xfer I think you are SOL....
Steve AKA Dr Deuce
PS: GMC did have a 'high traction' differential set up, but it was not a
locker or posi
----- Original Message -----
From: "tonygull" <tonygull@ozemail.com.au>
To: "Military Vehicles Mailing List" <mil-veh@mil-veh.org>
Sent: Wednesday, October 23, 2002 5:58 AM
Subject: [MV] CCKW Differential locks...also rear brake&axle O/H
> Greetings,
> I am overhauling my CCKW rear brakes and have found something surprising.
> When i tried to turn the wheels i could not do so until i jacked up both
> sides.
>
> With both sides jacked up on the rear-rear dif if i rotate the wheels the
> other
> side wheels rotate in the opposite direction. The propshaft did not rotate
>
> On the front axle i can rotate the wheel with only one side jacked up.
>
> On the intermediate axle i could not rotate the wheel with the other side
on
> the ground.
> the propshaft wanted to rotate, I did not jack up the othe side.
>
> I tested a car i know has limited-slip dif, when both sides are jacked up
> the wheels
> rotate in opposite directions. (This is what i have been told is proof dif
> spin-limiting devices are fitted
>
> This strongly suggests to me that both rear axles have locking (no-spin)
> difs.
> I have heard Detroit locks are available for GMC 2.5T axles.
> I also believe the IH version of the WWII Deuce had rear dif locks
standard
>
> Is there some other explanation?
>
> My truck has been modified for HEAVY-DUTY off-road use, so it is possible
> Transfield fitted some sort of locking dif...is there an easy way to
> tell?..with the dif cover off??
>
> The other good thing i found was all my rear brake cylinders had been
> sleeved
> with brass, which was just as well as everything was siezed..it was very
> hard
> to get the drums off, cause the adjusters were not operational.
>
> It must be a common problem..they are Delco-Remy 1.5" cylinders and the
> rotating outer
> adjusters rust onto the outside rim of the cylinders..I polished them with
> 400 wet&
> dry, then a thin smear of copper anti-sieze, followed by rubber
> grease..worked
> like magic.
>
> The pistons were siezed in the cylinders, but cause of the brass sleeve, a
> light
> hone and new rubber seals (proceeded by lots of cleaning) now like new (I
> painted the
> cylinders and all).
>
> Fitting new hub seals was a pain, I had to knock out the hub bearing race
> with a punch.
> then the wheel did not want to go back on axle flange cause the new hub
> seals were tight, even after soaking in oil.
>
> Also all the bearings were perfect (and Japanese so i can tell they have
all
> been
> replaced in the not-so-distant past).
>
> regards Tony
>
> ps I saw the 2nd last episode of Band of Brothers, which featured convoys
> of CCKW, DUKW, Jeep, Dodge and APC, by far the best episode for MV viewing
>
>
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