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08-10-2016, 11:02 PM
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#1
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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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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08-11-2016, 08:32 AM
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#2
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Join Date: Oct 2008
Posts: 586
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Options:
1- remover retarded diff gear to something more sensible.
2 - 44 driven and 13 drive nails it but 700's only have drive gears 15-20 teeth from what I have seen.
With a 1.15% speedo reducer, you can use a 15/ 44T gear combo.
1.45% reducer with a 19/45 combo.
1.5% with a 20/45 combo
Just be sure to order the correct orientation as you need to slow the cable speed down.
The first and last combos are very close w/in 2%
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08-11-2016, 06:01 PM
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#3
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Join Date: Dec 2009
Location: milltown
Posts: 1,497
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Thank you for your reply, this is becoming extremely frustrating, I never thought this would be such an issue. He wants to keep this gears, the 3.73s weren't enough gear and the 4.56s really seem to put the engine in the happy spot with the trans and it doesn't tach to high on the highway.
Anyways, I cannot find a 1.5% reducer, lowest I could find was 1.3% or 2.56%
http://www.ebay.com/itm/Stewart-Warn...3D361425811123
and
https://transmissioncenter.net/shop/...ratio-adapter/
so now what lol
__________________
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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08-11-2016, 06:10 PM
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#4
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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go electronic
dakota makes a box now I think to drive the speedo.
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Last edited by BonzoHansen; 08-11-2016 at 06:10 PM.
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