Performance Calipers for hopped-up Pickups

[TruckSTR]

There's some Wilwood GMIIIs with 2-3/4" diameter pistons - just like my '72 C10 calipers. I've downloaded the dimensional drawing from their site, but haven't had a chance to compare it to my stock '72 truck calipers. They may not even be DOT approved. I haven't called them to find out. I do know that Wilwood won't commit to whether the GMIIIs will fit the '72 spindle assy.

I guess that I'm just hoping against hope that somebody here has some experience with either my setup or something close before I drop the money for a set of GMIIIs. So far, LowBuckX, as mentioned in the OP, is as close as I've been able to come for somebody with experience. His fitting the '72 C10 pickup calipers (exactly what I have now) is encouraging. But the question remains as to whether the Wilwood GMIIIs are an interchangeable bolt-in or even if they'll make a significant enough difference to warrant the expense.

I don't know about the 3/4 ton calipers. Their bolt pattern is probably different. I know that the piston diameter of the ones that I've been able to get info on is 3-5/8". That's quite a bit bigger than the 2-3/4" of the ones I have.

So far, it SEEMS that the GMIIIs are my best bet. But who knows for sure? If I figure it out, I'll post it.

Thanks!