BucketTrucker688 Posted September 20, 2013 Share Posted September 20, 2013 i just replaced the (mechanical) speedometer in my 91 rd688s about 2 years ago...46000 ago exactly. the pin likes to jump with in about a 15mph window of what actual speed id and it also makes a grinding type noise...does this mean its going to go out on me again and i have to start back again at 0 mi? when i changed the speeodmeter i also changed the cable...also i run 11r24.5 tires which adapter am i suppose to use for it to get the correct reading? Quote Link to comment https://www.bigmacktrucks.com/topic/32850-speedometer-noise/ Share on other sites More sharing options...
Superdog1988 Posted September 27, 2013 Share Posted September 27, 2013 I'd start with the speedo cable itself. Mine was acting similar to what you describe and after a few days it stopped all together, changed the cable and it fixed the issue. Quote Link to comment https://www.bigmacktrucks.com/topic/32850-speedometer-noise/#findComment-208572 Share on other sites More sharing options...
Back In Black Pulling Posted September 27, 2013 Share Posted September 27, 2013 if you go to dealer and tell them what trans , gear ratio and tire size and brand they should be able to tell you which adapter you need Quote Link to comment https://www.bigmacktrucks.com/topic/32850-speedometer-noise/#findComment-208578 Share on other sites More sharing options...
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