I don't see any reason it wouldn't work. I believe I've seen factory set ups like that in the past, although I can't think of one off the top of my head.
Some big gay chevy IFS lift kits mount the shocks that way. Actually pretty common to put the ball joints in compression vs tension. It makes packaging harder which is why you don't see it alot in racing or in OE applications.
Search for a build done by Lil Rich a gew years back, done by a shop 531 Fabrication I believe. They mounted the coilovers and bypasses to the upper control arms rather then lower. As I recal, there was a lot of tech in that build. Granted, that was a solid axle build but I believe it worked well from what I remember reading.
Why do you say you're concerned about the shear load that the bolts will see? The spindle bolts in the pictures above (the one's I'm looking at anyhow....) should only see a tension load. Make sure to torque your bolts to the correct load, and you should be good.
Yeah, I forget that these only weigh about 1500 lbs!!:homer:
In the current set-up (coilover mounted to the lower control arm) as the suspension is loaded, the forces are transferred right to the chassis. With them mounted on the upper, the forces would go through the two bolts of the spindle, then to the chassis.
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