I'm intested in finding the same fix. My speedo with the 4.10 gears read (for instance) 140, when i was only going 100. So, it was way off... So far off I pulled the gear from the tranny so it now reads zero. Better that then having the wrong speed and getting a million miles on your odometer. I heard that you can get a "reducer" that fits in like with your speedometer cable, that changes how fast the speedometer cable spins. If anyone has more information about that let me know too!
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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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