Speedo recalibration
03-20-2009, 12:58 PM
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Car: '84 Z28/'82 Z28/'02 C5Z
Engine: 350 cam, boltons/350/cam boltons
Transmission: 700r4/700r4/M6
Axle/Gears: 3.73/3.43/3.43
Speedo recalibration
Sooo, the 700r4 went out in my 84, i replaced with a 87 r4, now i read about 10-11 mph highr at 65 mph, but its more accurate at lower speeds, only off by like 2-3 at 30-35mph. I used the same speedo cable and gears from my 84, is it possible that i installed them wrong? whats up?
03-20-2009, 01:24 PM
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Car: seeking '90.5-'92 'bird hardtop
Engine: several
Transmission: none
Axle/Gears: none
Re: Speedo recalibration
With a 3.73:1 gear, you need the 15 tooth drive gear, and for 25.7" tires such as 245/50R16s, a 44 tooth driven gear. For tires like 235/60R15, a 43 tooth, and for 245/60R15s, a 42 tooth. I bet you just swapped the driven gear but not the drive gear. There's 2 threads in here with part numbers for every 700R-4 drive and driven gear, I know because I submitted the lists to be made into stickys.
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