North American Turbocoupe Organization



speedometer acuracey
tornado427 Offline
Junior Member
#1
after reading one of the other posts I was wondering when I do my auto to manual tranny swap what will I need to do to have my speedo right? the rear gear ratio is different on the 5 speed & auto cars, and do they use the same drive gear? any help ? thanks

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88 turbo coupe stock (for now) 78 cobra II 302 ho shelby dual quad 4 speed 427 chevy 4x4
88 TC all options except leather, T5 swap, K&N in fender, Gillis valve, 78 cobra II 302 HO 4 speed, 95 mustang GT convertible 347 stroker, Trick flow track heat top end, powerdyne blower 10 lbs, devils own dual nozzel methanol injection, Astro A-5 trans, Detroit locker 31 spline moser axels, 3:55 gears (stock block time bomb)
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Pete D Offline
Administrator
#2
There are different drive gears available to compensate. Maybe someone else can give you a source. I think you can get them through Ford, not sure

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NATO Member. it's not a vice, it's an obsession
"The nice thing about each new day is nobody ever used it before" Barnaby Jones
88 TC X 2, 86 SVO, mods list at
http://www.turbotbird.com/showroom/pd_88tc.htm
Pete Dunham


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Jeff K Offline
Administrator
#3
You can get drive gears form Ford for about $8. I think you can get 18, 19, 20, 21 tooth gears. Just ask for the gear for a 5.0 Mustang w/ T5 tranny, as they are the same as the TC T5 gears.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 00 Windstar (wifes vehicle)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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natmac3 Offline
Administrator
#4
Just so the rest of us know, how do you decide which drive gear you need? I know after the 3:73 swap my speedo reads off by about 5mph.
1987tc
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