[Jack21]

My $0.02,

Double wishbone only. For reasons stated above, you don't want the axle doing double duty as part of the suspension, such that if it breaks, your rear suspension folds up.

Would like double wishbone, T-Bird 8.8, retrofit capable; weld-in, or bolt-in, hub to hub. brakes and coilovers optional. Choice of diff's, Eaton, Torsen, etc. 31 spline standard. Possibly leave the option for builder to procure his own center section diff.

Suspect the big block drag racing folks would use the Ford 9", or Dana instead of the 8.8.

Don't have a feel for a price tag. Have looked over the FFR, and SPF IRS's and they don't look overly difficult to make.

Is there any economy of scale in manufacturing these?

Anyway, list me as a potential buyer if the cost can be kept in the $2500 - 3500 range.