TR6 Rear Camber Adjustment
Lowering the rear ride height of a TR6 will increase the negative camber. This may be corrected by changing the “U” brackets mounting the semi-trailing arms. Three different brackets were used to adjust the height of the pivot bolt in relation to the mounting bolts to the frame. The brackets are marked by one, two, and three notches cut into the edge. When the brackets are mounted with the notches turned up, the pivot bolt will be offset from center approximately as follows: one notch: down 1/8”, two notch: up 5/16”, three notch: down 9/16”. Early cars used an inner bracket with one notch turned up and an outer bracket with two notches turned up. Turning the inner bracket to locate the notches on the bottom will raise the inner pivot bolt ¼” and reduce negative camber by approximately 1 degree. Further correction can be made by replacing the inner bracket with a two notch on top to raise the inner pivot or by replacing the outer bracket with a one notch on the bottom to lower the outer pivot. Later cars mounted the whole trailing arm a bit lower on the frame by using an outer bracket with one notch on top and an inner bracket with three notches on top. Again, negative camber can by reduced by lowering the outer pivot bolt or by raising the inner one. Keep in mind that your ride height will be effected by the average height of the pivot bolts in relation to the frame. Raising the pivot bolts brings them closer to the upper spring seat and increases the ride height.
When the rear ride height of a TR6 is lowered it is recommended that the bump stops on the semi-trailing arms be shortened. Thread the rubber bump stop out of the raised post on the semi-trailing arm then carefully draw a line around the post and ribs at the level where it is to be cut. Up to one inch may be removed. Saw the post off with a hacksaw taking care to cut on the line to maintain a level pad. Drill 21/64 and tap 3/8-24 deeper if necessary then install the rubber bump stop.