Help me figure out my rear gear ratio.

ComfortablyNumb

Founding Member

Apr 25, 2002

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40

LB- Jersey Shore

Jun 25, 2004

#1

• Jun 25, 2004

• #1

I put the AOD in first gear and let it run up the tach to 4000rpm at which the speedo said I was going 60mph. I thought that was kind of high and that either my speedo is messed up or i have a really low gear ratio in the rear. I have 225/55/16 tires which is 25.74 inches. I dont know what the AOD 1st gear ratio is, which is really all I need to figure out the rear gear ratio. Can someone help me out?

Sorry if this question has been beaten to death. I cant jack the car up and spin the tires to find out the ratio, because I'd have to do it in the street.

 

super302

I'd do anything for free Bapples

May 29, 2004

2,878

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39

Davenport, IA

Jun 25, 2004

#2

• Jun 25, 2004

• #2

you got up to 60 in first gear??

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

9,516

6

99

Arkansas

Jun 26, 2004

#3

• Jun 26, 2004

• #3

Have you messed with the speedo at all...new guages????...something isn't right...speedo gear could be wrong gear...etc...???

 

Euphoric306

New Member

Apr 5, 2004

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Jun 26, 2004

#4

• Jun 26, 2004

• #4

no, he was actually in second gear, cuz when u put aod in first, itll only go to first gear if youre going slow enough. 60 @ 4000 sounds about right for stock gears, i top out at like 78 or 80 at ~5000 rpm with my aod in second (first, whatever u wanna call it)

the for sure way you can find your ratio is by jacking up the back end, but ur street issue kind of sucks. dont you have a garage, and if ya do, why isnt ur stang already parked in it!?!?

 

5spd GT

"the 5.0 owns all"

Founding Member

Aug 7, 2002

9,516

6

99

Arkansas

Jun 26, 2004

#5

• Jun 26, 2004

• #5

Yeah...it it shifted into second...then that is about right...if not right on...

 

3

302RWP

New Member

Feb 8, 2004

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Northern California

Jun 26, 2004

#6

• Jun 26, 2004

• #6

How can you find your gear ratio by jacking your car?

 

Euphoric306

New Member

Apr 5, 2004

905

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Jun 26, 2004

#7

• Jun 26, 2004

• #7

long complicated process, jk.

jack up back end, put car in neutral with ebrake off. make a mark on your drive shaft and rotate tires once. however many times the mark passes a certain point is your gear ratio. (3 and a half times = 3.55:1 gears, just over 4 times = 4.10:1 gears, etc...)