From: Patrick Jankowiak (eccm@swbell.net)
Date: Wed Oct 23 2002 - 22:38:42 PDT
What does straining in the power train sound like? My M35 makes so many kinds of noise..
Steve & Jeanne Keith wrote:
>
> 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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> >
>
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