vibration at 70 mph, non tire related..
It is weird, i tried using two different sets of tires, it only happens at 70-75 mph, nothing less, and it will clear up at 80 mph somewhat.
i do have an aluminum d/s, the u-joints are'nt old, i feel it through the shifter, but also kinda coming from the rear? only thing i havent tried was rotating the d/s 180, but thats what im fixing to do, im stumped guys 
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X-Texas highway patrol ssp 1990 coupe - exploder Gt-40 iron heads, Explorer intake, 19 lber's. E-cam. crane 1.7 rollers. 190fp. 75mm maf. 65mm tb, tubular subframe connectors, mac cai, Asp crank pulley, T-5, king cobra clutch, flowtech 1-5/8 unequals, mac X-pipe Frpp driveshaft, lakewood Lca's.
race weight 3,160
12.69 @ 107.35, 1.71 60' 26x8.5 drag's 3.90 gear
13.20 @ 106.91 - 235/60/15 firestones 2.3 60' 3.27 gear
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