Speedometer is off....

vibrant5.0 · Mar 4, 2009

i recently put 3.73's in, and it threw my speedometer off quite drastically...im extremely happy with the new gears n i wouldnt change it for anything but does anyone kno what i have to do to fix how my sppedometer reads...the more speed i gain the more it is off when im cruising at around 60 it shows up at jus a lil under 70....

Javi · Mar 4, 2009

http://www.americanmuscle.com/speed-calibrator-94-04.html

:thumbsup:

CC'S95GT · Mar 4, 2009

expensive way is a speed cal. cheap way 23 tooth plastic gear that goes on the end of the speed sensor. speed cal is more accurate. plastic gear will wear out

Addermk2 · Mar 4, 2009

or you could do it the right way and change out the gear IN the tranny too..

x182dan · Mar 4, 2009

speed cal. You can even adjust for tire size.

LAFENATU · Mar 4, 2009

I changed to the 23 tooth gear and it works fine..I did it 6 years ago and it has yet to wear out.

Addermk2 · Mar 4, 2009

dont alot of people complain about the speedcal making their speedo freak out occasionally?

CC'S95GT · Mar 5, 2009

LAFENATU said:
I changed to the 23 tooth gear and it works fine..I did it 6 years ago and it has yet to wear out.

the stealership dude said the 23 tooth doesn't mesh perfectly with the gear in the tranny. and they usually only last 20-30 thousand miles. i think i have about 20k on mine so i'll be finding out soon.

duh09 · Mar 5, 2009

Speecal

And I've never had any problems with mine, except for install. And that was the previous owners fault, not the speedcals.

Inspector13 · Mar 5, 2009

To get it perfect you also gotta change the plastic gear in the tranny as well as the speedo cable to make it 100% correct, but every place around me charges about a grand to drop the tranny and take it appart to install the other plastic gear.

Noob question but how would the SpeedCal work on the '94/'95 5.0s?? I thought they were only for the '96-'98 4.6 computer controlled 'Stangs??

CC'S95GT · Mar 5, 2009

94/95's are electronic. there is no speedometer cable.

x182dan · Mar 5, 2009

I have never had any issues with the speedcal. It was pretty easy to install and the calculator they have up really makes it easy to figure out what you need to set it at.

Rice_slayer · Mar 5, 2009

I installed mine with the speedcal a month ago and love it. It's about 95%-ish accurate. Its more accurate than the 23 tooth gear, that is a perfect correction for 3.55s. Just drop the money on the speedcal, it's worth it.

MustangChris · Mar 5, 2009

i have the same problems with my 4.10s... we have different trannys (T5 vs T45) but i know for a fact (very smart and helpful ford racing sales rep helped me out) and with 16 inch wheels (stock on my car) and 4.10s ford does not make a speedo gear combo (tranny included) that will work for my car...

speed cal is my only option with 4.10s in a T45... dont know about 3.73s in a T5, but im assuming the same thing because the highest speedo gear i could find was for 3.55s from steeda. (steeda has for sale a speedo gear for 3.55s, 3.73s, and 4.10s, but they are all the same part number)

vibrant5.0 · Mar 5, 2009

thanks...ill check a bunch of them out n put somethin in

Addermk2 · Mar 5, 2009

I guess im one of the few that would rather swap the gear then waste my money on a speedcal

Rice_slayer · Mar 5, 2009

Addermk2 said:
I guess im one of the few that would rather swap the gear then waste my money on a speedcal

Speedcal is more accurate and lasts longer. Knowing how much attention my car gets from the po-po, I wanted my speedo to be as accurate as possible.

Addermk2 · Mar 6, 2009

please explain to me how the speedcal is more accurate than swapping both gears in the system...

and dont even give me the bullshit of (well, you dont know that your gear combo is 100% accurate... because how do YOU know that the gear set thats in your tranny right now is 100% accurate.

I'd rather pull my tailshaft off and swap the drive gear, than hack my wiring harness and put the speedcal in

x182dan · Mar 6, 2009

Addermk2 said:
please explain to me how the speedcal is more accurate than swapping both gears in the system...

and dont even give me the bullshit of (well, you dont know that your gear combo is 100% accurate... because how do YOU know that the gear set thats in your tranny right now is 100% accurate.

I'd rather pull my tailshaft off and swap the drive gear, than hack my wiring harness and put the speedcal in

If your gonna go through that effort then I guess its no better but speed cal is easier than pulling apart the rear of the tranny for me atleast. You can also adjust speed cal if you have different rear tires that are slightly taller/shorter than stock.

Rice_slayer · Mar 6, 2009

x182dan said:
Addermk2 said:

please explain to me how the speedcal is more accurate than swapping both gears in the system...

and dont even give me the bullshit of (well, you dont know that your gear combo is 100% accurate... because how do YOU know that the gear set thats in your tranny right now is 100% accurate.

I'd rather pull my tailshaft off and swap the drive gear, than hack my wiring harness and put the speedcal in

Click to expand...

If your gonna go through that effect then I guess its no better but speed cal is easier than pulling apart the rear of the tranny for me atleast. You can also adjust speed cal if you have different rear tires that are slightly taller/shorter than stock.

What he said. Most of us dont feel like taking apart our tranny's tailcone just to swap out the shaft for the speedo gear. Is the speedo gear more accurate when swapped properly? Of course! Is it more accurate when you just throw a 23 tooth in and leave stock other gear? No. We have these stupid radar things at some schools zones that tell you your speed and will tell you to slow down. I was going like 40kph(speedometer) and the thing said I was going 38kph

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