I could just build an equal length, parallel 4 bar system with a Watts link and call it a day. My truck will sit low so I should probably stick closer to the 5" mark for the z axis. So, by this math, my instant center z axis should be 5-7" off of the ground, with x axis to be 66.25" forward of the rear axle center line. So 57% of my 116" wheelbase is roughly 66 1/4". So, this puts 57% of my total mass over my front wheels. I am estimating that my weight distribution will be approximately RF-1000 lbs., LF-1000lbs., RR-750lbs., LR-750lbs. So, I am estimating that my '53 that will be sitting on a '94 S10 with BBC/TH400/9" will weigh in at about 3,500 lbs. I also read that instant center should be approximately 5-7" off of the ground (z axis). With regard to instant center, I have read that the distance of the instant center from the rear axle center line (x axis) should be the percentage of the wheelbase that would co-inside with the percentage of the vehicles total weight that sat over the front wheels. Planned on a +2.5 degree pinon angle at ride height. Instant Center Z-Axisđ0" (is this too high for good weight transfer) Roll Axis Angle 2 degrees (Roll Oversteer) Might be a good starting point for some critique. I have just started plugging some preliminary numbers into the calculator. I intend on running a 275-295 series rear tire and 255-275 front. So, when just cruising, I can yank the coil springs and run on the air bags. I intend to have the truck set up for coil-overs, as well as bags. I intend to clearance the firewall to move the BBC back somewhere in the 6-10". The truck is getting a moderately built 454ci/TH400/9" rear end. Will be driven 99% cruising on the weekends, realistically, but would like to participate in autocross for fun. My intentions for the truck is to be a weekend warrior that I can take to the occasional autocross event for fun. I am leaning toward a triangulated 4 link. I am in the preliminary stages of designing my rear suspension.
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