Speedometer Adjustment

Scrapla · 10-12-2004, 08:26 PM

I installed 3:73's in my 90gt 5spd and didnt get the adjustment for the speedo, how hard is this to install and is there a how to or some help in the Haynes or Chilton manuals because i'm tired of my speed being off and would like to fix this asap.

Scrapla · 10-13-2004, 05:01 PM

Anybody......

Ieatcamaros · 10-13-2004, 05:35 PM

Get the correct speedo gear. I got mine from Livernois for like $20. I don't know what teeth you need for the 3.73's. But all you have to do is pull the cable from the tranny, pull the clip off, change the gears, put the clip back on, and put your cable back in the tranny.

***Did some checking, it is a 20-22 tooth gear you need, depending on your tire size.

Fat0eknee · 10-13-2004, 06:53 PM

i think you can get the gear from a ford dealership as well ..but chances are they will be more expensive than other places

Jeff Chambers · 10-13-2004, 08:38 PM

http://home.neo.rr.com/chambersracing/speedo.htm

Scrapla · 10-13-2004, 10:27 PM

I hate to be a P I T A but does anyone have a pic of where the gear is located or pics of an install and thanks for that webpage but it looks like a I need a 23tooth gear and on the site it says "The 23 tooth driven gears are notorious at being short lived" if this is the case i'll just live with my speedo being off.

PKRWUD · 10-14-2004, 03:09 AM

You need the red 21 tooth gear, part #C4OZ-17271-A.

crazypete · 10-14-2004, 09:15 AM

They will actually keep working decently even when half the teeth are stripped off. My speedo was reading perfectly and when I pulled the gear out, it was ripped apart with every other tooth missing.

The gear is so easy to install that there's no point living with a miscalibrated speedo. The gear is on the driver's side of the transmission tailshaft just forward of the driveshaft yoke. You'll see a grey cable going into the back of a sleeve. It might also have an electrical connector. The sleeve is held in by a single bolt. Pull the bolt and the sleeve slides out. You will see the gear on the end. Pull out the cotter pin at the gear's base, switch gears and put it back in.

10-15 minutes tops.

Have fun!

Scrapla · 10-14-2004, 07:52 PM

Thanks, another reason I like this forum you guys/gals always have an answer the other forums I go on are just dead ends or no help at all.

DaTank · 10-14-2004, 11:39 PM

I have 3:55's, 16" tires, and I use the white (23) and it is pretty much right. Mine was chewed up too when I replaced it. The old one was in there for about 8 years. It is really easy to change, but you do have to pull kind of hard to get it out.
Check this place out:
http://www.50resto.com/

In search type in Speedometer gear.

Brad

Scrapla · 10-15-2004, 12:16 PM

Where is that part # from I ran it on jegs,summit,and 50resto with no luck.

Anyways I found the 21tooth gear on 50resto and it says its for 3:73's 1983-1989 5spd, and its the red one for $7.95 so is that it?

PKRWUD · 10-15-2004, 11:59 PM

That part number is the Ford number. But it sounds like you found one that will work.

DaTank · 10-16-2004, 10:10 AM

Your going to have to use, at least, a 23 tooth (white) with your combination. This is the largest so it will still be off a little, but it is the closest.
The 1983-89 with T5 transmission used a 7 tooth drive gear vs the 1990-95 used a 8 tooth drive gear. That's the reason a 21 tooth with 3:73 will work for the 1983-89.

Here is a chart so you can see:
http://www.gatineaumustang.com/FTspeedogears.htm

Brad

PKRWUD · 10-17-2004, 08:45 AM

Quote:

Originally posted by DaTank
Your going to have to use, at least, a 23 tooth (white) with your combination. This is the largest so it will still be off a little, but it is the closest.
The 1983-89 with T5 transmission used a 7 tooth drive gear vs the 1990-95 used a 8 tooth drive gear. That's the reason a 21 tooth with 3:73 will work for the 1983-89.

Here is a chart so you can see:
http://www.gatineaumustang.com/FTspeedogears.htm

Brad

He's correct. I thought you had an '88 T5. Must have been somebody else. I guess that's what I get for not being around as much these days. lol.

I'm not aware of any 24 tooth gears, but if you could find one, that's what you'd really need.

Jeff Chambers · 10-17-2004, 06:47 PM

Nope, no 24-tooth gears around. When you get to that point, you've got to start thinking about swapping out the drive gear so you can get the combination of drive & driven back to a workable solution.

crazypete · 10-18-2004, 08:34 AM

I ordered mountains of parts from the PATC guys. They carry 23 tooth gears

http://www.transmissioncenter.net/AOD.htm

Scrapla · 10-21-2004, 11:15 AM

Ordered the white 23tooth gear it says its for 90-98 3.55, guess this is the closest one

10-12-2004, 08:26 PM	#1
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Speedometer Adjustment I installed 3:73's in my 90gt 5spd and didnt get the adjustment for the speedo, how hard is this to install and is there a how to or some help in the Haynes or Chilton manuals because i'm tired of my speed being off and would like to fix this asap. __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

10-13-2004, 05:01 PM	#2
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Anybody...... __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

10-13-2004, 05:35 PM	#3
Ieatcamaros Domestic Rice really sucks! Join Date: Apr 2002 Location: KY Posts: 973	Get the correct speedo gear. I got mine from Livernois for like $20. I don't know what teeth you need for the 3.73's. But all you have to do is pull the cable from the tranny, pull the clip off, change the gears, put the clip back on, and put your cable back in the tranny. ***Did some checking, it is a 20-22 tooth gear you need, depending on your tire size. __________________ The sig says it all.

10-13-2004, 08:38 PM	#5
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	http://home.neo.rr.com/chambersracing/speedo.htm __________________ 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!"

10-13-2004, 10:27 PM	#6
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	I hate to be a P I T A but does anyone have a pic of where the gear is located or pics of an install and thanks for that webpage but it looks like a I need a 23tooth gear and on the site it says "The 23 tooth driven gears are notorious at being short lived" if this is the case i'll just live with my speedo being off. __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

10-13-2004, 06:53 PM	#4
Fat0eknee I'm slow ...I know. Join Date: Dec 2003 Location: houston Posts: 518	i think you can get the gear from a ford dealership as well ..but chances are they will be more expensive than other places

10-14-2004, 03:09 AM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	You need the red 21 tooth gear, part #C4OZ-17271-A. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

10-14-2004, 09:15 AM	#8
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	They will actually keep working decently even when half the teeth are stripped off. My speedo was reading perfectly and when I pulled the gear out, it was ripped apart with every other tooth missing. The gear is so easy to install that there's no point living with a miscalibrated speedo. The gear is on the driver's side of the transmission tailshaft just forward of the driveshaft yoke. You'll see a grey cable going into the back of a sleeve. It might also have an electrical connector. The sleeve is held in by a single bolt. Pull the bolt and the sleeve slides out. You will see the gear on the end. Pull out the cotter pin at the gear's base, switch gears and put it back in. 10-15 minutes tops. Have fun! __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

10-14-2004, 07:52 PM	#9
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Thanks, another reason I like this forum you guys/gals always have an answer the other forums I go on are just dead ends or no help at all. __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

10-14-2004, 11:39 PM	#10
DaTank Registered Member Join Date: Feb 1999 Location: washington state Posts: 78	I have 3:55's, 16" tires, and I use the white (23) and it is pretty much right. Mine was chewed up too when I replaced it. The old one was in there for about 8 years. It is really easy to change, but you do have to pull kind of hard to get it out. Check this place out: http://www.50resto.com/ In search type in Speedometer gear. Brad __________________ 1991 Mustang GT Conv. K&N air filter, Cobra manifold, 65mm TB, Adjustable fuel pressure regulator, 180 thermo., Mac headers, High flow H-pipe, Force II W/2 chamber Flowmaster, Hurst Shifter, 3.55 gears, subframes

10-15-2004, 12:16 PM	#11
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Where is that part # from I ran it on jegs,summit,and 50resto with no luck. Anyways I found the 21tooth gear on 50resto and it says its for 3:73's 1983-1989 5spd, and its the red one for $7.95 so is that it? __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

10-15-2004, 11:59 PM	#12
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	That part number is the Ford number. But it sounds like you found one that will work. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

10-16-2004, 10:10 AM	#13
DaTank Registered Member Join Date: Feb 1999 Location: washington state Posts: 78	Your going to have to use, at least, a 23 tooth (white) with your combination. This is the largest so it will still be off a little, but it is the closest. The 1983-89 with T5 transmission used a 7 tooth drive gear vs the 1990-95 used a 8 tooth drive gear. That's the reason a 21 tooth with 3:73 will work for the 1983-89. Here is a chart so you can see: http://www.gatineaumustang.com/FTspeedogears.htm Brad __________________ 1991 Mustang GT Conv. K&N air filter, Cobra manifold, 65mm TB, Adjustable fuel pressure regulator, 180 thermo., Mac headers, High flow H-pipe, Force II W/2 chamber Flowmaster, Hurst Shifter, 3.55 gears, subframes

10-17-2004, 06:47 PM	#15
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Nope, no 24-tooth gears around. When you get to that point, you've got to start thinking about swapping out the drive gear so you can get the combination of drive & driven back to a workable solution. __________________ 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!"

10-18-2004, 08:34 AM	#16
crazypete Registered Member Join Date: Sep 2002 Location: Boston Posts: 592	I ordered mountains of parts from the PATC guys. They carry 23 tooth gears http://www.transmissioncenter.net/AOD.htm __________________ 91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior

10-21-2004, 11:15 AM	#17
Scrapla Registered Member Join Date: Apr 2002 Location: Florida Posts: 532	Re: Speedometer Adjustment Ordered the white 23tooth gear it says its for 90-98 3.55, guess this is the closest one __________________ 90gt 347 and some bolt ons :-) RICE HATERS MEMBER #73

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