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Originally Posted by reddogracing
I am curious about this as well. I just installed new gears andused speedo from another car. My odometer logs 108 miles for every 100 i drive. Today I went by one of those moble radar machines, sppedo was dead on 25 radar said 23.
I had a lengthly drive on same parkway. I calculated at the end that I need to subtract 8.35% to calcualte mpg. After looking at the radar, if I subtract 8.35% from 25mph indicated I would be 23mph
So what drives them both that could be off? is there something in the speedo that is particular to each model?
I have always wondered why the little shift point indicators were so far off from what my tranny shifts at, maybe i got a gas speedo I do not know
Stock tire sizes. I am big 4x4 guy so I know how tires effect, smaller tires would do it, but i run avery slightly bigger tire.
I do not know what the cluster is out of. I know i put 12 12-48 48-15 gear set in it
I been wanting wheels and tires, I guess i could go bigger to offset everything.
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Quote:
Originally Posted by reddogracing
I figured mine out. when i swapped the gears the two inner most gears do not come in kit. I had the two inners from something else, I swapped the two inners and added two 48x12's and I am right on the money with odometer.
Did some more checking on speedo and found it was acrooss all speeds 2mph, so while i had it apart, I twisted it just a tad, and it is now right on as well.
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Thanks for the update. I had just assumed that someone had put a rear end out of an '85 in my '84, but hearing that your speedo/odometer issues are practically identical to mine, I'm rethinking that.
When you say you installed a used speedo out of another car, do you mean you replaced the whole cluster, or just the speedo part of it? You might already know this, but you can tell the gas cluster units from the diesel ones by looking at the left multi-gauge unit (oil/temp./fuel). If it has a fourth "economy" gauge on the bottom, you've got a gas cluster. The diesel clusters don't have the economy gauge.
So, just to be clear, what gears did you go from, and exactly what gears do you have in your speedo cluster now? I'd love to get mine working correctly without having to resort to larger tires to compensate.
Sorry to ask you to repeat, but I just want to be clear what gears to get a hold of. I've got a couple extra clusters to look at, but they all had the same issue, so I might have to order some to correct it.
Thanks.