MV Tooth Extraction, at Weare Rally - Transmission Problems

[lssah2025]

Always good to have spares, one box for three, sounds like the way to go!!

[Grant Bowker]

The original scale of spares lists transmissions at 4 per 100 vehicles per 12 months so on first glance the plan of 1 spare for 3 trucks seems a bit cautious. On the other hand, what good is less than a complete transmission if the plan is to be able to replace the assembly?
Another way to look at is that you are going to hold an 8 year stock (if my math is good) on a scale designed for service driving, use and abuse....... and much longer on your kinder driving, lower mileage and better maintainance program. You should be good for life.

[Lynn Eades]

Grant, Phil is scaling, based on a 25 year projection.

[Phil Waterman]

Hi All

When I started the thread I thought it would be more about the show and less about broken transmission teeth. But the search for new parts has been quite enlightening. So I requested that it be moved to the Restoration Forum.

Cheers Phil

[Phil Waterman]

Hi All

As of this afternoon a NOS Transmission is being shipped to me from Tim Tygarts http://www.obschevy.com/ of Nashville, Georgia USA. What is a bit strange is that the transmission was purchased by them with a lot of other Chevy parts probably 20 years ago. From the other photos it has only very light surface rust. They had to build a shipping crated to ship it so it will be interesting to see when it arrives.

This transmission was not listed in their online catalog in talking with the people down there they have a lot of parts which they have only a couple of which they do not list. So if you are looking for a particular part it may be worth contacting them. I have found them to very responsive to both phone and e-mails. Yes they do know how and are willing to ship overseas, though they did add the comment that shipping cost out side US or Canada often exceed the cost of the parts.

As I mentioned earlier I also found two used transmissions at Jim Carters http://www.oldchevytrucks.com/ both of them have the same casting numbers as Chevy CMPs. But again they were not listed in their catalog or web site it took contacting them with part numbers and specific request. They likewise were very responsive getting back to me within 24 hours with photos.

I will be posting more detail on this on my web site near future.

Who was it that had a broken transmission case a couple of years ago? Did you find a replacement?

Cheers Phil

[Bob Carriere]

Hi Phil

Just wondering if all the old ones you found at Jimmy's and the NOS one..... could they have different gear ration.......??? CMPs being rather unusual.

Was down for the Lobstawh festival in Maine..... a shame to drive by within 30 miles of your place and not have the time to stop in Temple.

Bob

[Phil Waterman]

Hi Bob

As the NOS and one of the others have the same open drive shaft rear out put housing I suspect that they will be the same gear ratio as the CMP because the open rear drive shaft was used on the bigger trucks and the closed torque tube drive shaft on the smaller trucks. I'm trying to find which gear ratios actually were different as offered by GM at the time. Know that 3rd is one of the gears the was different because most parts sources are specific about the number of teeth my CMP is 33 teeth on third gear, well more exactly it is 32 and 1/4 teeth.

One tip I have heard for telling the different lower clusters apart is that the big truck lower cluster has two groves machined in to the shaft see photo. I have not found how to determine which gears goes with what on the upper cluster.

One bit of information about both Jim Carter Parts and Obsolete Chevy they both will ship world wide I asked and they confirmed.

As to being in New Hampshire and not stopping by we would loved to see you and Joyce. But it would have added at least another 3 hours to your driving time plus however long we would have spent catching up. Just catching up could take a couple of days. Maybe next time we could plan a stop over. I'll take a picture of the view from the quest room and send it. Tell Joyce we have owls.

Cheers Phil