MV Tooth Extraction, at Weare Rally - Transmission Problems

[Bob Carriere]

How much time was needed to empty the vodka bottle to make a funnel ????

Very lucky indeed that the broken piece did not get flung aorund the innard of the tranny...... warm weather.... light oil.... heavy chunk just sank to the bottom.

Is there any way to check for such failure....possible cracks..... when doing a rebuild....... or maybe yours was just one of those bad Friday afternoon assembly.....chance in a million.

Bob

[Lynn Eades]

The failure looks fresh enough. Maybe just bad heat treatment and 70 years of use.
Phill, is the whole cluster junk, or does it press apart?

[Ganmain Tony]

It looks very, very clean inside the gearbox and the everything looks to be in great shape (apart from the broken tooth on third)... a credit to your maintenance Phil.

Noticed from your photo's the front drive shaft is obviously installed. You don't leave it out for driving on sealed roads?

As a general rule we do down under, mainly for less wear and tear. May also help with fuel mileage (but if I worried about that, I wouldn't own a 1941 truck)..

[Bob Carriere]

.....will help you out if you need one or two.......

Bob C.

[lssah2025]

That sucks believe me.... Well I will see you your tooth and raise you multiple teeth.. Pics from the transfer case to the front drive of my HSC.. Looks like the previous squaddie couldn't shift it into AWD...

[Phil Waterman]

Hi Guys

Thanks for the comments and questions:

Bob emptying the vodka bottle was part of the anesthesia for the extraction. As to checking the rest of the transmission for cracks as a preventive, I'm going to check into having all the gears magnifluxed but only if I can get replacement parts. If I can't replace them do I really want to know there are invisible cracks.

Lynn the third gear as several of the gears on the lower cluster are press on gear with pins, I've found a 3rd gear NOS replacement but need to check that it has the same number of teeth. According to one source Chevy had two different sets of ratios for this 4 speed box. My preference is to replace the entire lower cluster if I can find one.

Tony yes I have left the front drive shaft in, need it to be able to move the truck in and out of the shop in the winter on snow or to even drive the thing on wet grass with out tearing up the grass till the lugs on the tire get a grip on the dirt. I tried driving it years ago without the shaft in and it doesn't seem to make any difference in fuel efficiency, but I did get it stuck.

Bob, will let you know if I can't find one down here thanks for the offer.

Lance, from the looks of the teeth it looks like it was a Gorilla using his feet to shift the box, were you able to find replacement gears for the HSC?

Next step is to start cross referencing gear box part numbers CMP parts book, to Mapleleaf parts book, to Chevy US parts book. I'll be giving the source I found NOS upper shaft 5 years ago and see if I can luck out again.

Took me 2 hours 15 minutes to have the transmission out of the truck and apart on the bench. I suspect that was the easy part of the job.

Cheers Phil

[Bob Carriere]

You should point out that you work alone.......

....take your time...... the time allowed in the GM book is probably 3 or 4 hours...... at $105 an hour.

Let me know if you need anything.

Bob C

Lance......
...on the destruction of the transfer case.....based on experience M 37 Dodge the only time you would have that much damage is if the transfer case jumped out of gear while under a heavy load/torque. Trying to shift into gear while moving at high speed is almost impossible with straight cut gears..... it will grind a lot and small chips may break loose but rarely engage enough to really strip a series of gears.

God ... and Phil... only knows how finicky the 4x4 linkage adjustment can be on a CMP and how body flex can undo careful adjustments.

[Richard Farrant]

Originally Posted by Ganmain Tony

Noticed from your photo's the front drive shaft is obviously installed. You don't leave it out for driving on sealed roads?

As a general rule we do down under, mainly for less wear and tear. May also help with fuel mileage (but if I worried about that, I wouldn't own a 1941 truck)..

Hi Tony,
Removing front propshaft will make little difference to fuel economy as the front wheels are still rotating the drive shafts and diff in the front axle, this is where the drag occurs. Unless someone can produce a free wheeling hub, there is no practical solution unless you are prepared to remove the front drive shafts.

regards, Richard

[lssah2025]

Phil, yes my transmission and transfer case were rebuilt and other gears were sourced. That was last year that they were replaced. But I definitely feel for you. Almost having a complete restoration and then finding out about the darn toofeshhesss royally sucked. Had to take off the floor plates and rebuild everything so I think yours is probably easier to replace then mine was. As for the Humber it is usually in rear wheel drive and then only the front are engaged for off road traction. So someone probably jammed it into awd without knowing what they were doing. Bob, that is what I was worried about having all the little teeth and fragments come into contact with the other gears and viola they all get screwed.

[Lynn Eades]

Lance, I'm with Bob. It looks like she was only part way in mesh, or had walked (its self) out of full mesh under load. Did you find anything else wrong at the time?

[lssah2025]

No everything else looked pretty good might have had some water in the case over the years had some pitting but all the bearings, seals and gaskets were replaced so she purrs now, the throw out bearing was also replaced so the entire drive line, electrical, mechanical and pretty much front to back was restored and replaced.