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  #11  
Old 30-08-10, 20:48
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Quote:
Originally Posted by beggers View Post
Any idea what the 3.55 BMC units were fitted to?
I had a 3.7 in my Turner and I think lots were fitted to MG Midgets so try round the breakers.
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  #12  
Old 30-08-10, 20:52
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Quote:
Originally Posted by Fireblade View Post
Yes, as it happens, the 3.55 diff was fitted to Morris Minor vans with the Post Office being the biggest users. I had one fitted to my DNC 750.
I did know where there was a spare one lurking, a well known hillclimber had it as a doorstop or similar.
As dennis has remarked they were quite rare.
and here is me thinking that the Morris GPO vans were fitted with a 4:1 diff..............
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  #13  
Old 30-08-10, 20:59
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2 further thoughts:

Some Mallocks had Ford axles. Don’t know what sort but maybe you could get the Capri cut & shut? However, by the time you have new half-shafts, new wheels, appropriate suspension mountings etc it’s probably not worth it.

Second thought is to have a look at what some of the kit bike engined kit cars use. I think the Freelander diff is popular, but no idea what they put it in.
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  #14  
Old 30-08-10, 21:07
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Quote:
Originally Posted by Fireblade View Post
Yes, as it happens, the 3.55 diff was fitted to Morris Minor vans with the Post Office being the biggest users. I had one fitted to my DNC 750.
I did know where there was a spare one lurking, a well known hillclimber had it as a doorstop or similar.
As dennis has remarked they were quite rare.
Don`t know about the 3.55 but the GPO (yes I`m that old) did use 5.3 diffs in the Morris Minors (probably the split screen sidevalve ones!) which were as rare as hen`s teeth even in the 70`s I used them in my hillclimb Midget, could use all four gears at Wiscombe, change up at valve bounce!

Perhaps the 3.5 was 1st class post and the 5.3 second!

Regards Roger.
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  #15  
Old 30-08-10, 21:18
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Looks from Minitici’s figures you can avoid an axle swap which is good. However, would obviously be nice to have the option of changing final drive for different tracks. No need to take apart to find the ratio. Should be stamped on the nose piece: 11/41 means 3.7 10/39 means errm 3.9

There, just saved you the price of 3 paper gaskets.
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  #16  
Old 30-08-10, 22:12
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Only if the crown wheel and the pinion is as originally fitted,i changed either or both when i had the mallock
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  #17  
Old 30-08-10, 22:17
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Good point - I never worked out how to remove the pinion.
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  #18  
Old 31-08-10, 13:55
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The original BMC axle tweak was to remove the diff mounting studs, re-drill/tap for the Ford diff nose PCD, fabricate a spacer to go between the Ford diff carrier and the axle (Ford and BMC half shaft centres are a different dimension from mounting face to shaft centreline - I seem to remember between 3 and 5 mm), then you can use complete English Ford diff assembly.
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  #19  
Old 31-08-10, 14:53
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Moggy GPO vans used 4.55 , 4.9 or 5.1 ratios
some A30's had 4.55 or 4.9 ratios
3.9:1 is std midget

I am interested in finding out what the Mallock Ford/BMC conversion is,
I assumed they only used the Ford diff in the BMC carrier as this would retain the nice lightweight ally diff nose ?
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  #20  
Old 31-08-10, 15:40
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According to this link http://www.mmoc.org.uk/index.php?page=341 the Post Office Minor van used a 5.375 diff and the standard van 4.55. I remember the 5.3 diffs being like hens teeth...!! My Mallock MK16 used the BMC diff, but the later 21/24 used a Ford diff mated to a BMC axle. I think I recall 3.55 being a Ford ratio.
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