hi guys im building a tanker with an independent rear anybody know what kind of alignment specs i should use
Alignment is secondary to building a suspension with good geometry. No amount of alignment will fix a bad design.
I'd recommend using the trial version of Suspension Analyzer v2.4 from Performance trends Inc. You can try various things and see an immediate graphical result. If you want to buy it, and I'd recommend anyone who is building their own car do that, the cost is reasonable.
I used this software to design a 5-link rear suspension for my MS.
Regards, Neil Tucson, AZ