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#2
09-06-09, 21:39
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According to the parts book they are the same
Quote:
Quick look through CMP parts book shows only one ratio for all. Manual specs show the C30 and C60 series as being 7.16 to 1 while the parts book lists them as 6:43 ratio (same thing). Though your point is well taken if you could find a pair of ring and pinion gear sets from the heavy civi chevy truck, that used the same differential carrier, you could go to 6:39. This would give you better road speed while slowing down the drive train which would be a good thing for the road. But this option would only work if you were also up engineing as the 216 engine just doesn't have power. All in all the tire size, gear ratios, and engine size for the CMPs are probably a very good balance for conditions they were design for. The off road performance of CMPs is down right impressive. After 30 years of club trail rides people are still amazed that my HUP will climb anything a Jeep or M151 can climb. CMPs just do it slower.
__________________
Phil Waterman `41 C60L Pattern 12 `42 C60S Radio Pattern 13 `45 HUP http://canadianmilitarypattern.com/ New e-mail Philip@canadianmilitarypattern.com 
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#3
10-06-09, 00:47
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Taken from MB-C2 the diff ratios were different for the different rim sizes;
C-8A 5.42 to 1, C-15 6.17 to 1, C-15A 6.5 to 1, all others as mentioned 7.16 to 1.
__________________
Robert Pearce.
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#4
10-06-09, 15:54
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What is the interchange on differentials
As I don't have a full set of parts books so I can't confirm which Differential Carriers are interchangeable.
I do have the HUP and C60L 3Ton parts books and a quick check makes it look like not only are the Differential Carriers different numbers as well as different ratios. Also note that there are two different ratios listed for HUPs 7-38 vs. 6-37 which are not listed in the MB-C2 or MB-C1. Cheers Phil
__________________
Phil Waterman `41 C60L Pattern 12 `42 C60S Radio Pattern 13 `45 HUP http://canadianmilitarypattern.com/ New e-mail Philip@canadianmilitarypattern.com
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#5
10-06-09, 17:18
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All Good Info
All good info... thanks to all.
I have a business contact who is going to do a on-the-ground inspection of the truck for me. (I live 8 hours away..., he lives 25 minutes from the seller.) Any problems in particular he should look for? Thanks again! H
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#6
10-06-09, 18:37
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Rust in general - surface rust isn't the big problem, rot through of complex sections like the windshield frames is worse. Are there obvious missing parts? Are hard to find parts like the original mirrors (rectangular, slightly convex) present. Getting a spare wheel/tire (crazy small thing here - are all of the nuts present that hold the wheel halves together present? (they are an odd thread)) and any cargo body parts that can be used as a pattern is a bonus. What about the small lights on the front fenders and for tail lights (also rear axle convoy lamp) about half the length of a super fat cigar tube. Are there proper seat frames in the truck? What about the internal engine cover (doghouse)? Are there data and shift pattern plates present (total 4?)? What shape is the steering wheel in? The wood ones similar to CCKW/DUKW have been $200+ on eBay lately. The rubber ones for the Ford may be easier to find than the Chev, I don't know about this. Is there a condensation container for the radiator (on Ford over the frame rail to the left of the engine)?
Some of these things can be bought NOS or reproduction, but it adds to the cost. Last edited by Grant Bowker; 10-06-09 at 21:37. Reason: edited to fix spelling - too much hurry, not enough revision
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