jarendall
What size tires do you have? When we check ours buddies speedo with a GPS we found they were off by 12 to 19 mph. Most guys change the rear gears but not the speedo gear or they install the wrong one. Our Cobras are set up about the same and I sure I have smaller tires, 25 1/4". My speedometer is off by 1 mile per hour at 70 mph. I have to be close because I drive 7 or 8 over the speed limit and do not want to donate some of my car part money to the "officers".
But I have been stopped 5 times, but no tickets yet. I've got this thing about spinning tires.
Dwight
I guessed at your tire size 295/50-15
Second Strike Gearing Calculator
Speed (MPH) in Gears at RPM
Trans Ratio 3.27 1.98 1.34 1.00 0.68
Overall Ratio 10.69 6.47 4.38 3.27 2.22
Split 1.65 1.48 1.34 1.47
Gear 1st 2nd 3rd 4th 5th 6th
1500 11 18 26 35 52
2000 14 24 35 47 69
2500 18 30 44 58 86
3000 21 35 52 70 103
3500 25 41 61 82 120
4000 29 47 70 93 137
4500 32 53 78 105 155
5000 36 59 87 117 172
5500 39 65 96 129 189
6000 43 71 105 140 206
6500 46 77 113 152 223
7000 50 83 122 164 241
http://www.secondstrike.com/Technical/GearCalc.asp