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Remove the driveshaft. then the tailshaft, there are 4 bolts holding the tailshaft in. look inside and you'll see the drive gear. mine was held in with a metal spring clip. relieve the tension from the spring, then slide the gear/spring out. putting it back in, just reverse the method, make sure you put the clip into the slot on the gear and then slide it back in. the knotch on the clip should pop into the little whole on the shaft to hold the gear from spinning on it's own.

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Q: How do you change speedometer drive gear in gm 350 trans?
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