Speratic speedometer at 40mphand lower

Asked by Jun 08, 2016 at 10:16 PM about the 1999 Chevrolet C/K 2500 Extended Cab LB 4WD

Question type: Maintenance & Repair

Starts shifting sporadically when the speed gets below 40mph. The
speedometer bounces sporadically and the antilock brake light comes on and
the brakes won't work properly.  If I come to a stop the throttle is weard and it
wont shift untill I reach 35 mph. When it does shift it hammers it. I have tried to
reset the powertrain control module but it doesn't stay set very long.

2 Answers

80

Check your output speed sensor

18,765

Or just change the speed sensor

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