I noticed when building mine that the rear travel gets very stiff in the last 1/4, so much so I thought something was binding it.
What I've found is it's the rear dogbone drive shafts, remove them and it's fine no stiffening at all. Luckily I had bought a set of the optional rear CVD style shafts to try when I bought the car and with these fitted the rear suspension action is smooth through the full travel.
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