Am fitting sierra hubs using with the adapter plans provided by Dunc (thanks!).

According to what I've read, the top wishbone should have a slight rise as it goes to the wheel to provide suitable camber when cornering hard

But the sierra hub carrier is shorter than the cortina hub, so the wish bone is dropping down. (i.e. BAD geometry)

The obvious solution is to lower the wishbone pickup points on the body, but I think this will cause the wishbone to foul the spring/damper.

What to do?

Take a longer bush into the sierra strut. Tiger Cat has these as far as i know.
Your goal must be to come as close as you can get to the cortina setup.

Otherwise you have to recalculate and replace the upper and lower brackets.

IF u want no bump-steer, try to avoid messing around with the lower brackets

grtz Theo

I had this problem, which I solved as follows.

From the top wish bone, where the Transit track rod end screws in, I removed about 5mm of the wish bone.

When I did it this meant that I 'just' cut into the tubes which had to be re-welded to prevent any cracks etc. Filed the resulting face flat and square, and then refitted to the car.

Hope this helps?

Cheers,

The Baron.

Made a sketch of the geometry. I don't think the measures on the sierra hub I have are too accurate so it's hard to say what it is worth.
The upper arm is leaning the right way, 4.3° with 209 mm total length of the arm. Ride hight is 15mm higher, RC 20mm lower, virtual swing arm longer and camber gain at role somewhat less, than a book chassis.