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Old 11-05-2017, 12:50 AM   #1
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Join Date: Nov 2014
Location: Buckeye, Az
Posts: 118
Speedometer issues

I have a 69 c20 Suburban with a th400. The speedometer is good and accurate for about 10 miles on the highway then starts to jump around. It then slowly starts to read slower and slower until it dies completely. I have replaced the cable and still the same issue. Anyone know what might be causing this.
Thanks, Mondo.
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