How can I adjust wheelbase?

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I had tires/wheels on my fastback that would rub the fender on one side but not the other.
I changed offset of the rims and fixed it.

Could be a combination of all things mentioned...

S/S springs do change the attitude of the rear from side to side. It may be involved as well..
I would measure diagonally to check squareness of chassis. Could be a factory flaw ....
 
........look like stock upper control arms......
I just wondered if it be possible to end up with two lefts installed somehow.
Anyway, you may want to find a flat surface and plum bob that car for frame dimensions, just IMO.
 
I had a similar problem. One of the front spring eyes had unrolled on my leaf springs making them unequal lengths.
 
The factory bolts that secure the K have special conical shanks at the head end. As you tighten them, they draw the K into it's designed final resting place. Once the bolts are even just snugged, you can't move the K very far, certainly not anywhere near the distance you need. I would just pay the alignment guy the pocket change he wants, just to tell you what is going on. You can spend an entire day stringing the car and not know what 15 minutes on the rack can tell you.
But if you don't have those factory bolts, well yeah if you push one side all the way to the front and the other all the way to the back, then things can get crossed up. You need those factory bolts. The torque you put on them is not designed to keep the K from moving, only to keep the bolts from coming loose. Remember; ALL the forces that the front tires see, get into the chassis thru those 4 bolts. If the K slips on the road somewhere, at speed, that could really ruin your day; make sure the factory bolts are in there.
A similar thing is going on in the rear;ALL the forces acting on the rear tires get into the chassis via the front eyebolts. There are two sizes of bushings and IIRC each takes it's own bolts. In either case, the bolts have to be a tight fit inside the bushings and in the perches. The torque you put on those front eyebolts, again, is just to keep them from coming loose; the actual locations are engineered by the parts used.
 
You might be better off, renting a vehicle trailer from uhaul for the day and having the alignment shop look at it. They are like $55 here.
 
All of this with the alignment is true. You can certainly influence the wheelbase with alignment adjustments. But the original question was "Is the wheelbase adjustable?" The correct answer is, no it is not. There is no factory adjustment for wheelbase, because it is meant to be a fixed measurement. As in when all factory alignment specs are correct, the wheelbase will fall into spec. If you're having to try to adjust wheelbase using alignment adjustments, then you most likely "have something wrong".
 
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