1996 GMC 3500 Pickup Questions

Get answers to questions about your 1996 GMC 3500 Pickup at RepairPal. Find solutions, diagnose problems and get back on the road.

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It downshifts to 2nd hear, and if I let up, it will again shift up when I am below 40 mph.
Speedometer needle bounces. Speed sensor? Transmission shift sensor? Ideas?

what would cause the truck to shut off while going down the road and lose prime