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#1
03-02-17, 02:23
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Hi Alex,
Took some photos today of the joint assembly that was originally on my C8. If you want I can remove the yoke on the transmission and see if there are any part numbers.. Thanks, David 
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#2
03-02-17, 04:27
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No Joke about the yoke.......
HI Alex.
Those enclosed driveshaft tubes a much more avaialble here in North America and they regularly come up on Rbay as NOS stock. Around here any young hot rodder who installs a large V8 in an old GM truck usually scraps the enclosed tube/driveshaft system as being too weak ofr larger engines. I have a complete 1940 Chev one ton truck that has the complete power train. It is in bad rusted condition. Crawling underneath it has the same 4 speed tranny as a CMP...... left hand bellhousing clutch..... and fully enclosed driveshaft. It would not be difficult to replace the rear cover of the civvy 40 model with the open system of the CMP. A new driveshaft and suitable yokes and u-joints could be found to fit the new set up. The ease of doing the conversion is demostrated by other C8 owners who have done exactly that. Too bad the NOS parts here in North America are so heavy to ship overseas. I would not trust the welded joint in your truck. To get your truck on the road you could do the conversion and at a later date if you ever find all the parts needed for the original set up..... replace the parts......to return to original set up. All of which can probably done from underneath the truck. Good luck. Bob C
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Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada
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#3
03-02-17, 06:55
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The 40 to 46 pickups all used that setup. They also usually had a 4:11 gear ratio.
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1940 Cab 11 C8 Wireless with 1A2 box & 11 set 1940 Cab 11 C8 cab and chassis 1940 Cab 11 C15 with 2A1 & Motley mount & Lewis gun 1940 Cab 11 F15A w/ Chev rear ends 1941 Cab 12 F15A 1942-44 Cab 13 F15A x 5 1942 cab 13 F15A with 2B1 box 1943 cab 13 F15A with 2H1 box 1943 Cab 13 C8A HUP 1944 Cab 13 C15A with 2C1 box 1943 Cletrac M2 High Speed Tractor MkII Bren gun carrier chassis x 2
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#4
03-02-17, 08:59
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Alex, the spider and yokes failed , we fixed it twice , and tried to beef it up in the tube , but there is no room , if you want to step up one size in U joint.
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#5
04-02-17, 21:55
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I looked online and found that the u-joint "repair kits" offered by the Chevrolet parts vendors were said to fit '40 through '54 trucks with both 3 and 4-speed transmissions. Went to the shop today and pulled a u-joint assembly off a 1954 truck 3-speed, and also the front yoke from my busted original C8 4-speed transmission.
Sure enough, the u-joint from the '54 3-speed fit the C8 4-speed front yoke exactly. Both rear yokes are the same with 17 splines, but the front '54 3-speed yoke is smaller in diameter than the C8 4-speed one.. Alex, you are welcome to any of the parts in the photo, as I'll probably never need them... Thanks, David
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