When you de-arch the rear spring, will the spring rate change?
I very much doubt it - the elasticity of the metal doesn't change, the
amount of metal doesn't change, its layout doesn't change, the only thing
that could change the spring rate would be if the shorter leaves were
de-arched too much so that they weren't actually contributing anything, in
which case the spring rate would become softer.
If you use a block, to lower the rear, will the geometry change?
Not really, other than the change you get from the car being lower, the same
change you get driving over a bump or putting a fat bloke in the passenger
seat. The wheel must always remain perpendicular to the driveshaft, and the
inner end of that is fixed to the diff, and the position of the diff hasn't
changed. With the car lower the wheel will be further up into the
wheelarch, and so camber inevitably changes a bit with a lowered car. In
theory, with the neutral position being a bit higher in the car, the upright
will be at a very slightly different angle, and that will have a tiny effect
on the load vs. displacement of the wheel, but the effect of this will be
too small to be measurable.
If you redrill the rear vertical links, to lower the rear, will the geometry
change?
Ditto my above answer.
Why would a kit to improve the reverse gear, laygear+1st/2nd hub+reverse
idler gear, change 3rd gear? Is 155207 a British Leyland number? That is a
close ratio 3rd gear.
No idea!!
Richard Gosling
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