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Speedo gears for 700r4
My dad has a 1968 Camaro with a 454, 700r4, and 12 bolt rear with 4.56 gears with a 255/60/15 (27.05in) tire out back. I have gone through numerous speedometer gear calculators and most of them say I am SOL for that gear/tire combo with getting it to read correctly. One website suggested a 19 tooth drive gear and a 34 tooth driven gear. Those ratios were purchased and it was still off. Reading further into things it looks like anything with a 700r4 and over 3.73 ratios is gonna be off without going with a taller tire.
So I have come to the NJFBOA knowledge base looking for suggestions to resolve this and keep the current tires and not convert to a electric speedometer.
Thanks for your help.
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2002 Camaro Sunset Orange Mettalic, V6, 5spd, bilstein HD shocks and struts, eibach pro lowering kit, eibach f/r sway bars, lakewood PHB, UMI 2 point subframe connectors, energy suspensions poly master bushing kit
daily econobox and first car
1986 IROC-Z, T56, MGW shifter, Heads, Cam, Holley Stealth Ram 350, t-top, tubular LCA with relo brackets, adjustable PHB, belltech sway bars, ground control weight jacks, SLP mid length headers, 3in w/borla XR1, RIP 3 10 bolts, 12.7 @ 109 so far.. atleast its faster than stock  SOLD
1971 Camaro LS3/T56/9in, cam only and still carbed, RIP 2 10 bolts, 11.62@121
03 Blazer 2 door - salt sponge
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