veritas4156 Posted October 21, 2009 Share Posted October 21, 2009 Alright, so here's the deal. I had a suspicion that my speedo was off, so today I decided to do laps around the local college campus where they have a ton of those YOUR SPEED IS signs. So I hit a bunch of the signs and they all read pretty much the same thing. I got these results Speedo:Sign 30:25 25:21 35:29 So it seems like my speedo is reading about 25% over the speed that I'm going. Seems like everything is original on my truck, and seeing that it only has 56K miles(or possibly 44800?) I kinda believe that everything actually is original. I got a ton of receipts from the previous owner for work he had done(and he's had the truck since 12k miles) and they're pretty much all for oil changes and tune-ups. No major work. Any suggestions? Link to comment Share on other sites More sharing options...
MiNi Beast Posted October 21, 2009 Share Posted October 21, 2009 what size tires? bigger 235 to the stock 215 tires will put your speedo off about that much. Link to comment Share on other sites More sharing options...
veritas4156 Posted October 22, 2009 Author Share Posted October 22, 2009 I'm running stock size kankooks on the stock rims. No mods whatsoever. And if you were running bigger tires then your speedo would be reading lower than what you're actually doing, and 235s instead of 215s would only cause about a 5-10% discrepancy. Link to comment Share on other sites More sharing options...
MiNi Beast Posted October 22, 2009 Share Posted October 22, 2009 maybe your cable is getting loose so maybe time for a new one. Link to comment Share on other sites More sharing options...
Geonovast Posted October 22, 2009 Share Posted October 22, 2009 maybe your cable is getting loose so maybe time for a new one. I think he's referring to his 91. It could be a dying sender, or a frayed wire losing power on its way to the speedo. Link to comment Share on other sites More sharing options...
veritas4156 Posted October 22, 2009 Author Share Posted October 22, 2009 I think he's referring to his 91. It could be a dying sender, or a frayed wire losing power on its way to the speedo. Yep, the 91 has this problem. The 86 has bigger stuff to fix. I'll grab another sender from the JY and trace the wire and see what happens. Thanks Link to comment Share on other sites More sharing options...
LEAD_NOT_FOLLOW Posted October 23, 2009 Share Posted October 23, 2009 First thing I'd do is make sure your speedo gear on your TC is set correctly. There are different settings on it based on how many teeth your speedo gear has. You can "index" it by turning it to the correct location based on the teeth you have. Their are numbers on the side of it. Link to comment Share on other sites More sharing options...
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