I had to shim one of my uprights, it only needed about 35 thou or something like that but it was toeing in without that. I figured that for a home build that was not a bad amount of cumulative error. The drivers side was very slightly out but it was not enough to worry about, in my opinion. The way I measured mine was to use the bottom side rails as a reference, I used 1.5 metre straight edges clamped to the hubs when they were mounted to the uprights. I measured the distance between the straight edges next to the hubs, or as close as I could get and then at the other end of the straight edges, this showed the two hubs to be at exactly perpendicular to each other. I then measured from the rails to the straight edges to make sure the wheels were aligned to the chassis, otherwise I may have got "crabbing". I read somewhere that a small amount of toe in on the rears increases stability but have not been able to verify if that is true or not. Anybody got any comment?
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