need help with recalibrating my speedo

bml · 03-16-2006, 08:20 PM

I recently had 373 gears installed. My mechanic told me that I had to buy a hand held computer to recalibrate my speedometer. I called the local speed shop and they said they could use a 21 tooth gear, which they will install in the transmission and they said that it would cost 70.00. I have a 97 gt with a 5 speed transmission, also which is the cheapest and best way to go. Any advice will be helpful. bml

Jeff Chambers · 03-16-2006, 08:42 PM

With a 97, you can just change the driven gear on the speedometer cable at the transmission. It'll cost you less than $10 and take about 10 minutes once you've got the car up in the air. 99 and later require either a Speedcal unit or changing it with a handheld/custom tuning.

bml · 03-16-2006, 09:24 PM

Thanks for the reply Jeff, very much appreciated. bml

bml · 03-22-2006, 12:10 PM

Could anyone give me the details of putting the speedo gear in the transmission. I was told you have to drop the pan on your transmission. Any help eould be appreciated. bml

Jeff Chambers · 03-22-2006, 09:55 PM

Get the car up in the air. You'll see at the tailshaft housing where the speedometer cable goes in to the housing. Use a 7/16" wrench to remove the clamp bolt at the cable/tailshaft. Pull the end of the cable out of the tailshaft housing. Use a small screwdriver to pry the c-clip off the plastic speedometer gear. Slide the gear off the end of the cable. Slide new gear on to cable. Reverse the disassembly procedures to re-assemble. Don't over-tighten the clamp bolt though, just snug it up nice and firm.
Total time once the car's up in the air is about 10-minutes for a first-timer.

bml · 03-26-2006, 04:41 PM

Thanks Jeff for the reply. You saved me some money and I appreciate it. Since I don't have jack stands. I'll take it to my mechanic with the details you gave me. Thanks again. bml

bigwhitecobra · 03-27-2006, 02:56 PM

yeah what jeff said.....

03-16-2006, 08:20 PM	#1
bml Registered Member Join Date: Nov 2004 Posts: 14	need help with recalibrating my speedo I recently had 373 gears installed. My mechanic told me that I had to buy a hand held computer to recalibrate my speedometer. I called the local speed shop and they said they could use a 21 tooth gear, which they will install in the transmission and they said that it would cost 70.00. I have a 97 gt with a 5 speed transmission, also which is the cheapest and best way to go. Any advice will be helpful. bml

03-16-2006, 08:42 PM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: need help with recalibrating my speedo With a 97, you can just change the driven gear on the speedometer cable at the transmission. It'll cost you less than $10 and take about 10 minutes once you've got the car up in the air. 99 and later require either a Speedcal unit or changing it with a handheld/custom tuning. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

03-16-2006, 09:24 PM	#3
bml Registered Member Join Date: Nov 2004 Posts: 14	Re: need help with recalibrating my speedo Thanks for the reply Jeff, very much appreciated. bml

03-22-2006, 12:10 PM	#4
bml Registered Member Join Date: Nov 2004 Posts: 14	Re: need help with recalibrating my speedo Could anyone give me the details of putting the speedo gear in the transmission. I was told you have to drop the pan on your transmission. Any help eould be appreciated. bml

03-22-2006, 09:55 PM	#5
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: need help with recalibrating my speedo Get the car up in the air. You'll see at the tailshaft housing where the speedometer cable goes in to the housing. Use a 7/16" wrench to remove the clamp bolt at the cable/tailshaft. Pull the end of the cable out of the tailshaft housing. Use a small screwdriver to pry the c-clip off the plastic speedometer gear. Slide the gear off the end of the cable. Slide new gear on to cable. Reverse the disassembly procedures to re-assemble. Don't over-tighten the clamp bolt though, just snug it up nice and firm. Total time once the car's up in the air is about 10-minutes for a first-timer. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

03-26-2006, 04:41 PM	#6
bml Registered Member Join Date: Nov 2004 Posts: 14	Re: need help with recalibrating my speedo Thanks Jeff for the reply. You saved me some money and I appreciate it. Since I don't have jack stands. I'll take it to my mechanic with the details you gave me. Thanks again. bml

03-27-2006, 02:56 PM	#7
bigwhitecobra Huh? Whatcha said? Join Date: Oct 2000 Location: Fayetteville, NC Posts: 1,073	Re: need help with recalibrating my speedo yeah what jeff said..... __________________ 2003 GT White---STOLEN May you burn in hell whoever took it. Dumbazz didn't even get the good engine that was in the garage.

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