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Old 02-01-2016, 01:34 PM   #1
davepl
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Join Date: Aug 2006
Location: Redmond, WA
Posts: 6,334
Speedo Gear Question, plus needle bounce

I made a few minor changes to my speedo calibration:

- New speedo warning head from unknown ratio truck
- New trans with overdrive and unknown expected rear end ratio
- Different rear end ratio
- Taller tires

So, as you can see, all bets were off. But driving by a speed sign I magically found it said 38 when I was at 36. I figure that's close enough, but would I get much closer if I did the math on the error and changed a gear?

Also, I have a tiny bit of needle bounce, like in a 2-3mph window. Anything I can do about that doesn't require rebuilding the speedo? Cable is silent and new.
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1970 GMC Sierra Grande Custom Camper - Built, not Bought
1969 Pontiac 2+2 427/390 4-speed Coupe
1969 Pontiac 2+2 427/390 4-speed Convertible
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