Rear end location wrong? IM STUMPED!!!
Here are some pictures I took and I did some measuring also! I measure 1 3/8" back of leaf by hangers on both sides. LR tire to leaf f/b i got 1 1/8" ...RR tire to leaf f/b 1" and front of leaf to frame on drivers 1 1/8" passenger front of leaf to frame 1". If anyone needs more pics let me know and where
thanks
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Ok, so measuring from spring to frame you're only at ~1/8" difference side to side, which is 100% within tolerances. Interesting point is that your tire to spring clearance is also off by an 1/8" side to side, which again is very much within tolerances for the axle on the springs, but both 1/8" discrepancies are on the
same side. So left to right you pick up a 1/4" difference on how far the tires stick out. You're stacking tolerances.
At the tire to quarter clearance you've got 5/8" and we'll call it 1/8". So we know where a 1/4" came from, that leaves 3/8" to account for. Well, there's another 1/8" in the quarter lips themselves, the side that has more clearance also has a quarter lip that's an ~1/8" narrower. So now we're down to a 1/4".
Looking at your pictures, something else becomes apparent- the ride height may not be the same side to side. In your tire to quarter pictures, the left side measurement is right at the widest part of the tire. On the passenger side, it looks like the measurement is actually a little bit above the widest part of the section width.
So for measurements, I think there's a couple more to take. The height of the quarter opening to the ground (or race ramp) on each side, and then the quarter lip back to the frame rail.
My guess is that your passenger side is sitting a little higher (which gives it a little more clearance) and the drivers side wheel tub is probably a little bit narrower quarter lip to frame.
There are a few other measurements you'd have to check, but to me it seems that the rear axle is pretty much centered in the chassis, at least within factory tolerances. And the issue you've got is tolerance stacking. The springs a smidge off, the rear axle is a smidge off, the quarters are a smidge off, the ride height isn't quite equal, and all of those tolerances are stacking on the left side.
You could try loosing up your front hanger on the left side and trying to shift it over a touch. Same with the u-bolts, you could loosen them (on both sides) and see if you can shift the axle on the springs over to the passenger side. There isn't much to get at either spot, but if you picked up a little bit on each one you might gain another 1/8" of clearance.
And you could trim or roll the quarter lip back. Unfortunately with the axle over the springs it's really easy to lower the car, but it's not easy to raise it up. So for equalizing the ride height it would be easier to lower the high side than it is to raise the low side. But you need to raise the low side to gain more clearance.