----- Original Message ----- > I would like to swap my standard 4.22
differential for something with a
> higher gearing. I know the later 3.9 is the most common swap but I am
> interested if the 3.73 differential from the 1500 Midget will go into a
rear
> housing from a Sprite MkII. Would the crown & pinion fit directly into the
> older rear housing? Is some machining necessary? Or would it be necessary
> swap the entire rearend and axles?
> So is this a easy or hard swap? Help me out you Techies!
>
> Jim Rogers
New 3.9, 3.7 and 3.5 diffs available in the UK through the Theifrow MG
place. No address, but someone must know it. Daniel? Guy? I can get a
discount but the postage would still be about $70. Riley 3.9s fit into the
4.22 casings on Minors, so there will be no problem, so long as you have a
filler plug hole on either the axle casing or the diff. The late 1500 axle
on my pre-war has a 5.3 diff with a filler plug, in an axle casing with a
filler plug. Presumably that means that there are some combinations where
you would get no filler plug at all !!!!
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