don't forget that tube diameter is relative to roll. thickness of the tube is usually matched to the vehicle(ie- sprung weight, weight split)its like a giant swaybar/torsion bar.
mx5 diff would be easy to mount. early ones are easy to get and all imports had lsd( only aussie 1800's had lsd) usually cheap too because mx5 guy like to update to later model torsens(nb series).
what size early camshaft are you after?

As long as the axles move independently thats the whole point.
Alfa Romeo specifically chose Dedion over other designs for
ease of tuning and results from the start.
Triumph had heaps of issues as did other companies with the
normally accepted IRS setups.
Camber can be changed dramatically also with DeDion.

but not IRS at all... wasn't that the design brief?

Been thinking about it since I perved under a volvo 360 at
the end of last century :) but only 3 years ago got the bits
and now finally decided its time. Only because Ive seen the
other day some suv with alloy irs diffs, eg. Rover Freelander
and Nissan Xtrail. However the Rover being the simples has
no cheap LSD avail as far as I know.

How ironic someone posted this; I'd been thinking about the possible advantages of a De Dion suspension set up. Rather than having to fab all the IRS pick up points you could use any IRS set-up and connect the uprights to the De Dion tube. I was thinking MX5 / Miata parts with possibly alloy tube.................just a thought.

Tom

True about the unsprung weight but if I can go alloy
Id be happier keeping with the featherweight theme.
Its a shame about the Rav4 as there was one at Kylsith
not long ago (Disco Bob I think you wouldhave seen it?)
Any chance of a peek at your inboard discs or info?
I was thinking of using alfa inboards, CVs and uprights
easy to find and adapt to the volvo setup.
Im shortening the Volvo single leafs which are very solid
even overkill for the thouee but better safe than rooted.

theres another also using a set of leafs
http://upload.wikimedia.org/wikipedia ... RRearViewUnderCropped.jpg

Here you can see the Alfa inboards, CVs etc

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Also interested in this one....

should be great. never seen a de dion with leaves. for my honda i have an r160 with inboard discs custom tube and early passat hubs and uprights. i'm thinking of changing to an early rav 4 diff (easy to adapt and mount, and 2 door has a torsen)and has cv's. have you worked out a camber angle yet? are you looking for an alloy centre for weight? diff will be sprung weight not unsprung.moving the brakes inboard saves unsprung weight. cant wait to see it fitted.

IRS in the simplest way for an original leaf setup car.
Always wanted IRS and 99 inch wheelbase for 1000.
Easiest way for my limited "hands on" skills.
The Volvo 360 is actually a DAF which got bought by V.
The Daf had leaf sprung rear and later upgraded to DD IRS.
DeDion lets me angle the wheels to a fixed camber degree
by simply angling the outer brackets if need be.

any point other than to get an LSD?