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Old 02-02-2012, 05:33 PM   #1
NYMUSTANGZ
 
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Default Ring and Pinion

when i bought my stang, the previous owner had the rear gear ratio swapped to 4.10. I just had the rear axle changed and forgot about this. the mechanic who changed the axle, put on a new 2003 mustang GT axle. Did he swap out my ring and pinion and change my rear gear ratio back to normal? If so, where can i get a speedometer gear tooth to change my speedomter back to normal? :-( thanks again guys!
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Old 02-02-2012, 05:45 PM   #2
cliffyk
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Unless you specifically asked him to swap the gears I doubt he would--but why not ask him? All we here can do is speculate.

The only two ways to correct the speedometer for differing gear ratios on an '03 are to alter the tune, or use a device called a Dallas Speed-Cal.

If it was changed in the tune then you will have to have the settings changed back to the stock values in the tune. If a Speed-Cal is installed you can change the DIP switch settings on the Speed-Cal. The S-C is usually installed under the shifter surround as shown in the installation instructions (linked to above).
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Old 02-02-2012, 06:20 PM   #3
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So every axle comes with a new ring and pinion?
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Old 02-02-2012, 06:37 PM   #4
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Quote:
Originally Posted by NYMUSTANGZ View Post
So every axle comes with a new ring and pinion?
If you mean he swapped out the whole rear axle (the housing and all), then he had to reason to open up the diff and remove any gears. If you had 4.10s and its back to 3.27s it should be very noticable. +1 with what cliffy said call and ask.
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Old 02-02-2012, 06:50 PM   #5
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Quote:
Originally Posted by NYMUSTANGZ View Post
So every axle comes with a new ring and pinion?
Typically when people say "rear axle" they are referring to the entire rear axle assembly: housing, pinion, differential carrier, axle shafts and all:

Click the image to open in full size.

Or do you mean literally just one or both axle shafts?

Click the image to open in full size.

What exactly was changed?
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SOLD! - 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum,
Delta Force tuned, Steeda UDPs, Ralco flywheel,
RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq


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At its extreme it is making what you want from what you can get.
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Old 02-02-2012, 06:50 PM
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