Get 4.10's... changing to 3.55's would be a waste. Are you just a street racer or a real racer? If you take the car to the track there is no reason not to get 4.10's. The idea of a gear change is to make use of all your gears, not just 1-2-3 w/ a stick, use 4th... you should top out in 4th at slightly higher RPM's then your shift point. My car in overdrive was at 2600 @ 70-75. I drove it all over, my only car for 3 months. 3.55's are just way to conservitive...
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Joe Zemaitis, Grand Rapids Michigan
1991 Mustang GT. Mods to date: 4.10 rear end, new POSI, aluminum driveshaft, AOD w/ shift kit, 2 1/2 off road h-pipe, 2 1/2 flowmasters and 2 1/2 tail pipes. Electric fan, Removed air pump and egr tube. Hotchkins upper and lower control arms. New energy suspension rear busings. Hoosier Quick Time Pro 27x10.5x15 and bolt on subframes soon to be welded. Everything else is STOCK. Totally stock ENGINE. 14.29@96 with 130k miles.
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