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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 10-05-2005, 05:58 PM   #1
inahury1
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Default 4.10 gears with AOD Speedo Cal?

I am putting 4.10 gears in My 93 5.0 with AOD and from what I read I can't get a speedo gear to correct the speed. Is this coorect or am I missing something. If I install the 23 tooth how far aprox. will the speedo be off.
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Old 10-05-2005, 08:14 PM   #2
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Default RE: 4.10 gears with AOD Speedo Cal?

i have had no issues getting correct speedo gear. for my car is a white gear. and LMM has them
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Old 10-05-2005, 08:27 PM   #3
89stanglx
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Default RE: 4.10 gears with AOD Speedo Cal?

my speedo gear is black but it still is a 23 tooth, i cant remember where i got mine. Summit,or ford racing mine indicates about 5 mph faster that im going at around 60 but im sure its my tires they are slightly shorter that factory size.
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Old 10-06-2005, 12:40 AM   #4
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Default RE: 4.10 gears with AOD Speedo Cal?

Where does the speedo go ?
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Old 10-07-2005, 01:19 AM   #5
inahury1
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Default RE: 4.10 gears with AOD Speedo Cal?

Thanks, I will get the white gear ordered and try it out!
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Old 10-07-2005, 01:48 PM   #6
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Default RE: 4.10 gears with AOD Speedo Cal?

YOU CANNOT correct an aod w/ 4.10's by driven gear change alone. it would take a 26 tooth gear which would never work for about 10 miles maybe, if it even existed

you have to replace the drive gear which is machined on the output shaft, so you need the entire output shaft, and disassemble the trans to do it...you can get to about 15% off thats it.

an aod is 8 tooth drive , and you would need a 6t drive w/ a 19 t driven or 7t w/ a 23 t driven (but they aren't any good)

both aod's i had had 21t driven and were purple.....w/ 3.27's

here is the part numbers for them, the 23 tooth are for t-5's and will work for about 15-20 k b4 thrashing
you can also get a calibration box installed...but i think it's big $$$$$$


Auto Trans. Driven Gears
(17271)

Number of Teeth / Color / Service Part Number

16
Blue
D0AZ-A

17
Green
C7SZ-A

18
Gray
C7SZ-B

19
Tan
C7VY-A

20
Orange
C8SZ-B

21
Purple
D0OZ-B

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Old 10-07-2005, 03:53 PM   #7
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Default RE: 4.10 gears with AOD Speedo Cal?

so true.now with a tire change it could get very close
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Old 10-08-2005, 12:50 AM   #8
inahury1
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Default RE: 4.10 gears with AOD Speedo Cal?

Well You got Me thiking, Me wife drives the car once and a while and it would drive her crazy, therfore makig My life more difficult if you know what I mean. What about the 3.73 with the 23 tooth would this combo be in the ball park?

Thanks for all the info,
Preston
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Old 10-08-2005, 11:14 AM   #9
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Default RE: 4.10 gears with AOD Speedo Cal?

should be w/in 5-8% (which is still noticably irritating)
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Old 10-09-2005, 05:34 PM   #10
inahury1
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Default RE: 4.10 gears with AOD Speedo Cal?

OK really confused Know I pulled the driven gear out and it is a 19 tooth and the car has 3.27 gears does this mean I have a 7 tooth drive gear in the tranny?
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Old 10-09-2005, 05:34 PM
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