Which tranny gear is this?
 

The tranny I just bought had a speed sensor on it and it has a black gear with twenty teeth. Does anyone know which ratio this is for?

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1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler

Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

What kind of tranny? AOD? if it's got a speed sensor and not a cable it's probably off of a T-Bird, cougar, or some other merc or lincoln. Check this out if it's a T5,
http://www.coolcats.net/media/T5info.xls

it will tell you the speed drive gear teeth number, then you might be able to figure out the ratio somehow. I know of a page that will tell you exactly what you want to know, but I can't find it right now, I'll be looking.

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Michael Black
Quantum Motorsports
Norman, Oklahoma

1988 Merc Cougar 5.0 HO, P&Ped heads, 2.25" custom mandrel bent dual pipes, T5 five speed tranny
15.43 @ 91.08mph (not shabby for a 3600 pound car)
60' 2.453 Street tires suck!!!

The 20-tooth black gear is part number C1DZ-17271-A. It would work with 3.73:1 gears if you've got the 7-tooth drive gear which was stock for most T5's.

I've copied the table from the FRPP catalog and have a javascript calculator for the speedo gears on my website. Just follow the URL in my sig.



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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team

Hey Jeff, would you know if a 92 T-5 has that 7-tooth gear? I have read that the 90-93 T-5's have 8 teeth yellow gears...

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1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler

Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

I would suspect 7-tooth. The 93 T5 I bought new from D&D had a 7-tooth in it. I haven't seen a production T5 with the 8-tooth in it.
Only way to know for sure is to count the teeth. Use a mirror on a stick and you should be able to see/count the teeth.

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Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team

OK...I'll check it out...thanks Jeff

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1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler

Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.