NYMUSTANGZ

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!

cliffyk

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).

NYMUSTANGZ

So every axle comes with a new ring and pinion?

uberstang1

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.

cliffyk

Typically when people say "rear axle" they are referring to the entire rear axle assembly: housing, pinion, differential carrier, axle shafts and all:



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



What exactly was changed?