It should be pulling like a madman with the 4.30's, mine is.
Jack the car up from the diff. Get under the car right by the driveshaft. Put a mark at some point on the driveshaft. Have your friend turn the rear wheel one whole revolution while you count how many times the driveshaft turns. If it turns 4.3 times, than you have 4.30's. 3.7 turns would be 3.73's. Get it???
Later, Jason
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1997 Cobra -- #572 of 6,961, White, FMS 4.30's, Steeda Tri-Ax shifter, WMS Velocity Tube, Dynomax Race Magnums, HPM Megabite Jr. Control Arms, HPM Driveshaft Loop, FMS "C" springs, Manual Fan Switch, Autometer Shift-Lite, "REAL" FMS Chrome Cobra R's (street), BFG Drag Radials 275/50/15 (strip)
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13.42 @ 107.75 MPH (2.183 60 ft.)