Robert Pearce Starts to restore

[Harry Moon]

Originally Posted by John Stokes

Hi Robert,
I notice in your photo the part of the gearbox is broken,i had one the same do you know why they break here? Maybe it is the tail shaft bolts comins loose?

It's because the ring gets left out. there is no part # or picture in the exploded view in the manual. 3 of 4 transmissions that I had broke that way. You must put a 3/8 wide steel ring which can just be a strip of bar steel welded together, you put it on the out put shaft before you put the out put flange on the back of the transmission. without it you won't be able to tighten the center bolt with out pulling it up to tight and interference between the bolts will shatter it again. I wrote an article in convoy magazine specifically about it. Can anyone scan the article and send you it?

[Harry Moon]

you must have this ring.

[Harry Moon]

This is the ring, you might find it if you look around but since your transmission was broken it is probably missing. Just bend a piece of 3/8 steel strap around the shaft and weld it together. thats all the original is anyways.

[hrpearce]

Hi Harry,
Thank you for the advice, I checked and I have the ring. I plan to make locking tabs to tie the bolt heads together.

[Harry Moon]

The original seal on the rear had a metal flange that covered all 4 bolts and held the seal. I'll try to get you a picture of it.

[hrpearce]

Harry as you can see the flange is a reck after the bolts were bent . The seal with flange is listed as discontinued so I had to buy modern seal and a bottle of 609 to stick it in with

[Harry Moon]

This is the condition of probably 80% of the cmp trans I've come aross. You have to be real careful and put the bolts in the flange facing rearwards before tightening it up. It is to easy to put the output flange on and then put the bolt and nut on when putting the short drive shaft on. I almost broke my one good one as soon as I put it in.

[Bob Carriere]

We had the same situation when we replaced our tranny seals. We could not source a replacment seal with the sheet metal flange. Luckily our sheet metal flange was good ..... we basically drilled out the old flange on the spot weld and used it as is to hold the seal in place. In a pinch one could cut a flange out of 20 ga sheet metal as a substitute. We were concernd that without a flange the seal might move out.

Like Harry, and thanks for his insight fromt he Convly magazine, we looked and found the elusive ring...... but it seems that the yoke bolts do work free with time....like 50 years and can them strike the bolt heads of the tranny rear cover with varying devastive results.

Interesting to note that early rear casting had the speedometer gear hole machined and plugged when not used.....as shown in Robert's rear cover.... as the cable goes to the transfer case. It seems that later in production... cheaper white metal castings were eventually produceed with the same provision for the speedo cable BUT knob for the speedo cable was left blank and not machined...... probably castings made exclusively for the CMP 4x4 as opposed to early off the shelf Civvy type.

Needless to say the cheap white metal castings really desintegrate when the bolts are hit by a flange bolt at full torque.

The other weak area of the tranny casing are the two "ears" at the front that allows the top 2 bolts to connect ot the bellhousing.... but hat is a different story again....

BooB