Axle not centered

[Cesars70]

I recently purchased a 70 blazer Dana 60 front,14 bolt rear with 456 gears, Detroit lockers, Disk brakes and a reverse shackle with cross over steering installed. I was told by previous owners the truck can run 40” tires. I bought 40s installed and it looks like the rear axle is pushed forward. Any luck and how I can get this fixed and what exactly is the issue?

 

[iwaxmyjimmy]

The rear shackle flip will do that. You can get some zero rate add-a-leave, redrill the perches, or some different spring perches all together to move it back. And really that rear shackle angle sucks.

 

[OnlyOneDR]

It's all geometry. The leaves on the rear of these 1st gen Blazers are relatively short so when you use a shackle flip or shackle lift and do not adjust the front hanger it effectively pushes the axle forward. Easiest "fix" is the zero-rate as mentioned above, but you can simply unbolt the packs, re-drill a new hole in the perch forward of the centered hole, and drill a new matching hole in the clamping plate on top of the leaf pack. Does the same thing as the zero-rate, but nearly free aside from labor. You can do it on yours because you have formed steel perches; the zero-rates are necessary if you have cast perches that you only get a centered hole in.

My stock height '69 has always looked like the axle is slightly ahead of center, if I had a shackle like yours on it I am certain it would look uneven. On my Nissan I used long perches on my 14B with holes drilled ahead of center to shift the axle back just like I described you can do above.

 

[Jeff B]

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