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post #1 of 11 (permalink) Old 05-13-2013, 04:31 PM Thread Starter
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Orange 20 tooth?

I finally have time to work on my Bird. I swapped over to 3:55 with trac lok. I want to correct my speedo and from what i'm reading here, i need the orange 20 tooth, is this correct? I have 255/60-15 tires on rear and they were very close to correct with stock rearend gears. TIA

95 Thunderbird LX 4.6
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post #2 of 11 (permalink) Old 05-13-2013, 06:13 PM
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You need a 19 tooth, not a 20.

-Brandon
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post #3 of 11 (permalink) Old 05-13-2013, 10:19 PM Thread Starter
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Not doubting you, you know more than me. I got the 20 tooth idea from here http://forums.tccoa.com/showthread.php?t=132130
Are you suggesting 19 tooth due to my tire size? Thanks again

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #4 of 11 (permalink) Old 05-14-2013, 06:34 AM
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The method to calculate needed speedo gear is to multiply the number of output shaft teeth (7) by the rear gear ratio (3.55) and the number of tire revs per mile (745), then divide by 1000. Your result is 18.51 because your tire is so large. As the tire wears down and decreases in diameter your speedo will get more accurate.

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
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post #5 of 11 (permalink) Old 05-14-2013, 09:11 AM Thread Starter
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Is there a 19 tooth available for my transmission? Only see a 19 for 8 tooth output shaft. Mine is a 7 tooth shaft.

95 Thunderbird LX 4.6
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post #6 of 11 (permalink) Old 05-14-2013, 09:49 AM
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http://www.americanmuscle.com/speedo...ooth-auto.html

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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post #7 of 11 (permalink) Old 05-14-2013, 09:49 AM
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Originally Posted by Buckcreekbilly View Post
Is there a 19 tooth available for my transmission? Only see a 19 for 8 tooth output shaft. Mine is a 7 tooth shaft.
Same gears, but the number of teeth you need for a certain rear ratio changes (by 8:7 or 7:8, depending on which way you're talking about).

PATC shows a 19 tooth gear at http://www.transmissioncenter.org/Fo...eter_Gears.htm .

They're local to me, but I can't say past that. That, and they've been there 90 forevers, it seems *grins*

Before you order, what was your old rear ratio, what gear did you have, and what's the new ratio?

Ideally, you compute the number of teeth you need from the same ratio as the one between the two rear ratios, and order that.

That is, if you went from 3.08 to 3.31, and your old one was an 18 tooth, then you'd want ( 3.31/3.08 ) * 18 teeth on it ... or in your case, 19 teeth (nearest match).

RwP
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post #8 of 11 (permalink) Old 05-14-2013, 12:21 PM Thread Starter
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Thanks guys

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #9 of 11 (permalink) Old 05-14-2013, 05:12 PM Thread Starter
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Ordered one today from local Ford dealer, be in tomorrow $7.95 plus tax.

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #10 of 11 (permalink) Old 05-14-2013, 06:12 PM
No, Mr. Lemmywinks, No!!!

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I missed this, but this is the calculator I use.

From our friends at SCCOA:

http://www.sccoa.com/faq/speedgr.html



I thought 19 was stock?

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post #11 of 11 (permalink) Old 05-14-2013, 06:59 PM
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18 is stock. I use my own calculator.

http://alhscds.dyndns.org/TireCalc.html

-Brandon
97 Laser Red Thunderbird LX 162k, Stage 2 4.6L 2v N/A | 300 BHP (255 RWHP, 290 RWTQ) | 13.95 @ 97.58 | Build details | Pics at the Lorain Assembly plant
98 Black Mark VIII 160k, stock daily driver
07 Redfire Fusion V6 SEL 178k, for the wife
Gone but not forgotten: 96 Mark VIII, 94 Cougar XR7, 93 Mark VIII

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