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#1
28-02-10, 23:51
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transmission swaps
Have any of you CMP owners tried to swap your transmissions for one with synchromesh, like the GM SM420 transmission? How easy was your conversion? Were you happy with it?
John 
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#2
01-03-10, 01:35
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Transmission swap
Hi John
Yes the later chev truck trans can be fitted. you would require the later bell housing to suit preferrably the one with the horizontal engine mounts . Starter , flywheel , handbrake and clutch are ok. The later trans may butt against the rear of engine crossmember so this will require altering ( bending or cutting ) The trans is also longer so on 4wd this will require a back to back uni joint and on 2wd a shortened tailshaft. There does not appear to be any problems with this conversion as the SM 420 is a very robust simple trans. Regards Jim S.
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jim sewell cmp and cckw
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#3
01-03-10, 01:43
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Website
Quote:
I found this website about the SM420: http://www.novak-adapt.com/knowledge/sm420.htm Also suggest you go to stovebolt.com which is one of the best Chevrolet restoration websites and go to their Tech Tips. Kind Regards Lionel
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1940 Chevrolet MCP with Holden Built Cab (30 CWT). 1935 REO Speed Wagon. 1963 Series 2A Army Ambulance ARN 112-211 Series III ex-Military Land Rovers x 2
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#4
01-03-10, 02:05
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Can be done....but.....
HI John
The tranny swap can be done.... the big problem is that the 420 is much longer and you will have to spend $$$ to get a custom made very short drive shaft to link up to the Transfer case..... or move the engine forward or move the T-case and cross member backward. The original CMP 4 speed is incredibly short by todays standards. Some additional problems maybe encountered when you install the emergency brake lever... it will probably bolt right on but be in a different location that will not match the floor opening. Which CMP model are you working on..... C15a would be easier than the C60 because of the different system for engaging the front axle which bolts on the tranny for the C60.... Bottom line anything can be made to fit if greased with enough $$$$$ I had original plans to install the 4 speed that came with my 261...fully synchro.... would have been a dream...... gave up and went back to the CMP tranny to avoid all the headaches... Boob
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Bob Carriere....B.T.B C15a Cab 11 Hammond, Ontario Canada
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#5
01-03-10, 03:39
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I don't see why anybody would want to change them over. There's something neat about driving one of those old gear crunchers with their telltale noise and all.
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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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#6
01-03-10, 04:55
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I'd say if you are going to the trouble of changing the transmission go with a possibly easy route. Change everything (ie Engine, Transmission and Transfer case) I know of a 30cwt that runs a chevy 350 with a TH400.
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#7
01-03-10, 09:46
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Gday,
I have a CCKW five speed gearbox fitted to my C15 radio van and it works great + it gives me a higher cruising speed which i haven't worked out yet due to no speedo drive, mind you it keeps up with jeeps ok.
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Hybrid Mode
