They will actually keep working decently even when half the teeth are stripped off. My speedo was reading perfectly and when I pulled the gear out, it was ripped apart with every other tooth missing.
The gear is so easy to install that there's no point living with a miscalibrated speedo. The gear is on the driver's side of the transmission tailshaft just forward of the driveshaft yoke. You'll see a grey cable going into the back of a sleeve. It might also have an electrical connector. The sleeve is held in by a single bolt. Pull the bolt and the sleeve slides out. You will see the gear on the end. Pull out the cotter pin at the gear's base, switch gears and put it back in.
10-15 minutes tops.
Have fun!
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior
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