How off will speedo be?

Synned · Apr 17, 2005

If I buy a used rear with 3.73 gears from stock 3.27 and do not upgrade the stock speedo gear how off about will my mph be? Is there a place to buy just the upgraded speedo gear for the transmission?

Thanks

WhiteStallionGT · Apr 17, 2005

Dunno if this will help, but I went from 2.73s to 4.10s and my speedo is almost double.

1105 · Apr 17, 2005

2.73's is a big jump to 4.10's. Your speedo will be off but probably only by a little bit. You should still have somewhat of a good idea of how fast you are going.

Any local speed shop should have the gear, if not check out summitt, jegs, etc.

Venom351R · Apr 17, 2005

Spedo gears are not that expensive $20 max and changing them is not really that had. Its better then always trying to guess what speed your going in at what RPM and always having your mileage be off.

Hef5.0weisen · Apr 17, 2005

I went 2.73 to 3.55, had some cop friends clock me, my speedometer read 50, the gun said 43, that was prior speedo swap, just to see. good luck man

95WhiteVenom · Apr 17, 2005

stock 3.27 is now 3.55 on my cobra install by previous owners. My guage is off by 4mph.

burtieburns · Apr 17, 2005

i put in at t56 and it has the 3.55 speedo in it and i still had the stock 3.08 out back and i got clocked 15 over.

mo_dingo · Apr 17, 2005

With 3.73's you want the 23 tooth (white) gear. Get it at a Chrysler/Jeep dealership. The ones ford stocks are purchased through chrysler and marked up to $20+.
Scott

final5-0 · Apr 17, 2005

I'm runnin the 23 tooth gear and at about 75mph it reads about 3mph too fast.

Been that way since 1997 with no probs.

Later
Grady

BPH90LX · Apr 18, 2005

Anyone know where I could find out how to change the speedo gear to fix the MPH? Previous owner went to 3.73's and it wasnt done.

Hef5.0weisen · Apr 18, 2005

BPH90LX said:
Anyone know where I could find out how to change the speedo gear to fix the MPH? Previous owner went to 3.73's and it wasnt done.

with that gear i think you want the white, 23 tooth speedo gear. changing one is cake. get under the car, look for a plug on the driver side, rear of transmission, it's just above all the hangars for the mid pipe. disconnect electrical plug, remove 11mm bolt, pull sensor out of transmission, and you'll see the gear. there is a circlip retaining it on the sensor, just pop it off, replace speedo gear, and slap it back together. takes 10 mins. a shop will probably charge you a good bit for that, hope that helps...good luck man
oh yeah, that's for a 5 spd, don't know if an auto is the same....

How off will speedo be?

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