Did u use a 5/8 drill bit?

What model car ?? A 10" wheel/tire combo will fit a b-body without spring relo or mini tubs. That's a LOT of work and expense for zero gain - ask me how I know !!!

I moved mine back 1" on the Dart, it went a bunch of 1.38 60' with a pump 93 408.

With leaving the rearend in the stock location how tall of tire can you run with out trimming the front of the wheel well?

When I ran a 275 I moved the rearend back 1/2" to get clearance.

275 60 ???

Yes.

Here we go!!!! I made this jig up to help hold in place

My girls

I have a question the back of the car is level I measured from the torsion bar crossmember back to the beginning of my boxes and they both are the same measurements However when I cut out the boxes on the frame the cuts are a little bit different
Keep in mind everything is level I have both boxes in. And I have a piece of all thread that’s going through the boxes and into the old hangers and that all thread is level
I check the measurements on the boxes and the Holes
drill are exactly the same from front to back and top to bottom

I Put a level on the very back of the boxes that go into the curve Of the. Frame and those are level




The question I have is the length of the cuts Are different I can’t see how or I could be wrong maybe the curvature of the frame is different from right to left. One cut is a half inch longer than the other

Basically when welding on top of the box the distance would be greater to one side than the other has anybody came across this

Put a plumpbob on the spring eye bolts. Lets get some marks on the floor, for a good reference. Thre most important thing is your bolt hole placement. The box isn't as important as eye bolt placement, are they staight, parrel , level, even.

The frame rails on my son's 1968 Dart 270 are different. From the wheelwell lip to the frame rails outter wall the right side is about 7/16 shorter. The tire will rub on the right but not on the left. I thought I had messed up so I got under with a plumb bob and sharpie and made all sorts of marks on my concrete floor. My spring boxes are welded in the right place on the frame rails but not in the centerline of the whole body. It is still 7/16 inch offset. FUBAR!

I ASSuME'd the factory was close....

the quality of the factory underbody was horrible "back in the day", and comparing your frame/chassis/unibody measurements to the measurements found in the FSM is sure to find your measurements are "slightly" [] off !
as said, check for level and square, and for kicks, run some strings to the grease fittings in your lower ball joints to check the alignment of your front/rear suspension to each other.

THIS ^^^ BEFORE welding the boxes in!!!
When the 68 Dart 270 had the 7 1/4 with 155/78 13's it did not look like the axle was 7/16 inch offset to the right. But with the 325/45 20's you can tell real quick.

If I had known it would have been a bit of work but I would have offset the boxes 7/32's to the left side.

It is done and the easy fix is to offset the spring perch's and reweld them on the 8 3/4 housing.