Speedo Gear Question

Harry · 08-20-2002, 12:38 PM

I am just hoping someone can verify this for me. I am (finally) having the 3:55 gears put in my mustang and am gonna have the speedo gear changed at the same time. I am thinking that I need the black 20 tooth gear.

I have an 8.8 inch rear, 16 inch tires size 245/50R16, T5 Tranny

Thanks

SlowGT · 08-20-2002, 01:09 PM

Off the top of my head, I think it's the pink one but I'm not sure. I'll look it up for you when I get home if you haven't got a certain answer by then.

302 LX Eric · 08-20-2002, 01:10 PM

You'll need a 21-tooth white gear.

With your setup and a Tremec 3550, you would need the 20-tooth black gear.

Hope this helps.
E

mysweetlx · 08-20-2002, 01:16 PM

Harry, try www.steeda.com. I'm pretty sure the one you want is part # 123-0023 which is the 23 tooth white speedo gear listing at $15.95.

302 LX Eric · 08-20-2002, 01:19 PM

Yeah, like I said, the 23 tooth white gear.

Hey, at least I got the color right.

E

todd95GT · 08-20-2002, 01:35 PM

go to the hanlon motorsports webpage. i think it's www.hanlonmotorsports.com , if not, type the name in your search engine. they have a chart where you enter your time size and gear ration and it will tell you which drive and driven gears you will need.

Harry · 08-20-2002, 08:13 PM

So, which is it? The Hanlon site says it's the 20 tooth gear, I would assume the black on, not the orange one. Where are the rest of you getting your information??

Thanks

Harry

PKRWUD · 08-20-2002, 08:29 PM

YOU NEED THE BLACK 20 TOOTH GEAR!

The 23 tooth white gear is only for the '93 Cobras.

Take care,
~Chris

todd95GT · 08-20-2002, 09:15 PM

time size and gear ration? what the heck was I thinking?

Go with what Hanlon says, which happens to be what Chris says, too. The chart tells you what the ratio is and which pair of gears will bring you closest to optimum.

SlowGT · 08-20-2002, 11:16 PM

try this math from the FMS 2002 catalog:

(drive gear teeth X axle ratio X tire rev per mile)/1000 = # of teeth on the driven gear.

(7 X 3.55 X 815)/1000=20.25 ==>black

815 is rpm for a 225/60-15. TireRack has pretty good info for finding rpm for your particular brand/size.

for T-5:
21T = red
20T = black
19T = pink

302 LX Eric · 08-21-2002, 07:44 AM

So is this why when I took out my old T-5, the speedo gear (the white 23T one) was all chewed up?

The shop that installed my gears (does a ton of gear swaps for Mustangs) said that the white gear was the proper one and installed for me.

What crap that is.

So, if my Tremec is a 6 tooth drive w/3.55 and 815, I get 17.3595. So, do I have the wrong gear? (I've got the 20T Black gear - That's what D&D told me I needed)

Ok, I'm offically confuzzed now!

Someone please set me straight.

E

RPM427 · 08-21-2002, 08:23 AM

OK!! I just went through this mees this morning. listen up.

The following trannys have a 7 tooth drive gear:

- 1983-1989 T-5 OEM
- Pre 1993 T-5 Aftermarket
- 1996-1998 Cobra T-45 OEM
- All Tremec Transmissions

2.73 Gear Ratio / Maroon 16 Speedo Gear
3.08 Gear Ratio / Yellow 18 Speedo Gear
3.27 Gear Ratio / Pink 19 Speedo Gear
3.55 Gear Ratio / Black 20 Speedo Gear
3.73 Gear Ratio / Red 21 Speedo Gear
4.10 Gear Ratio / White 23 Speedo Gear

That means you Harry. You will need a BLACK 20 tooth speedo gear for your 3:55 gears.

This may be helpful to everyone else.

Manual transmissions with 8 tooth drive gears include:

- 1990-1995 T-5 OEM
- 1996-1998 T-45 OEM Except Cobra

2.73 Gear Ratio / Yellow 18 Speedo Gear
3.08 Gear Ratio / Black 20 Speedo Gear
3.27 Gear Ratio / Red 21 Speedo Gear
3.55 Gear Ratio / White 23 Speedo Gear
3.73 Gear Ratio / White 23 Speedo Gear
4.10 Gear Ratio / White 23 Speedo Gear

302 LX Eric · 08-21-2002, 10:34 AM

Thanks for that great info, RPM427

So, I guess I was right with the white 23-tooth gear for a 91 T-5 w/3.55s and the Black 20-tooth gear for my Tremec is correct too.

Thanks,
E

todd95GT · 08-21-2002, 10:41 AM

Just a suggestion... use the Hanlon chart at the website and replace the drive and driven gears. Just replacing the driven gear with a 23 tooth to compensate for not changing the other means you'll have a lot of teeth in a small little gear. The 23-tooth gears DO fail. For 23 bucks delivered you can get them both. I just ordered a 6 and 19tooth set for my upcoming swap to 4.10's.

mysweetlx · 08-21-2002, 01:39 PM

Quote:

Originally posted by 302 LX Eric
Thanks for that great info, RPM427

So, I guess I was right with the white 23-tooth gear for a 91 T-5 w/3.55s and the Black 20-tooth gear for my Tremec is correct too.

Thanks,
E

I guess I was rght too

! Harry, w/ your stock T5, you need the white 23 tooth from Steeda. You're welcome.

RPM427 · 08-21-2002, 02:35 PM

I just spent 45 minutes trying to get the 23 tooth gear locally. Ford only makes gears up to 21T so don't anyone waste thier time trying to get one in a auto parts store, it looks like steeda is the only option

302 LX Eric · 08-21-2002, 04:00 PM

You can get them from D&D Performance too.

You can reach them at (248) 926-6220 or on the web at www.ddperformance.com

They have a speedo gear chart there too!

What's interesting is that they comment on the white 23T gears stating that they are not a Ford gear and therefor don't mesh perfectly with the tranny drive gear. Thus, they can become stripped - which is exactly what happened to me with my old T-5 setup.

Hope this helps,
E

RPM427 · 08-21-2002, 07:43 PM

My speedometer and trip meter is working fine, but after seeing what the gear looks like while I am doing the clutch, I don't understand it. It is all chewed up.

Harry · 08-22-2002, 07:30 AM

RPM427, thanks for all the info. I am sure a lot of people will be helped by all of that.

Mysweetlx, no I don't think you are right. According to RPM427's chart, and also the Hanson web site, I need the black 20 tooth speedo gear.

I just dropped my mustang off at the shop today to have the gears changed. Going from a 2.73 to a 3.55 should be a great improvement! I can't wait to get it back and see how it does.

Thanks everyone.

Harry

todd95GT · 08-22-2002, 12:45 PM

Quote:

Originally posted by RPM427
My speedometer and trip meter is working fine, but after seeing what the gear looks like while I am doing the clutch, I don't understand it. It is all chewed up.

Like I mentioned previously, Ford doesn't produce the 23T gear because it is an unreliable way of getting around changing both the drive and the driven gears. 21 teeth is the highest amount of teeth that will reliably fit on such a small gear. Replacing both gears is the sure way to do it right. Teeth have been known to strip off of the 23T gear.

08-20-2002, 12:38 PM	#1
Harry Registered Member Join Date: Oct 1998 Location: Dayton, OH USA Posts: 678	Speedo Gear Question I am just hoping someone can verify this for me. I am (finally) having the 3:55 gears put in my mustang and am gonna have the speedo gear changed at the same time. I am thinking that I need the black 20 tooth gear. I have an 8.8 inch rear, 16 inch tires size 245/50R16, T5 Tranny Thanks __________________ 1985 Mustang GT 2002 F-150 Last edited by Harry; 08-20-2002 at 12:47 PM..

08-20-2002, 01:09 PM	#2
SlowGT Registered Member Join Date: Jun 1999 Location: Columbia Co, PA Posts: 303	Off the top of my head, I think it's the pink one but I'm not sure. I'll look it up for you when I get home if you haven't got a certain answer by then. __________________ Old Slow GT New Slow GT--> under construction Latest Addition: 95 Cobra R, #73, bone stock, ~6100 miles.

08-20-2002, 01:10 PM	#3
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	You'll need a 21-tooth white gear. With your setup and a Tremec 3550, you would need the 20-tooth black gear. Hope this helps. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

08-20-2002, 01:16 PM	#4
mysweetlx Registered Member Join Date: Apr 2002 Location: New York Posts: 248	Harry, try www.steeda.com. I'm pretty sure the one you want is part # 123-0023 which is the 23 tooth white speedo gear listing at $15.95. __________________ Damn this thing's fast!

08-20-2002, 01:19 PM	#5
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Yeah, like I said, the 23 tooth white gear. Hey, at least I got the color right. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

08-20-2002, 01:35 PM	#6
todd95GT Registered Member Join Date: Aug 2001 Location: Palm Beach Gardens, Florida, USA Posts: 191	go to the hanlon motorsports webpage. i think it's www.hanlonmotorsports.com , if not, type the name in your search engine. they have a chart where you enter your time size and gear ration and it will tell you which drive and driven gears you will need. __________________ Todd

08-20-2002, 08:13 PM	#7
Harry Registered Member Join Date: Oct 1998 Location: Dayton, OH USA Posts: 678	So, which is it? The Hanlon site says it's the 20 tooth gear, I would assume the black on, not the orange one. Where are the rest of you getting your information?? Thanks Harry __________________ 1985 Mustang GT 2002 F-150

08-20-2002, 08:29 PM	#8
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	YOU NEED THE BLACK 20 TOOTH GEAR! The 23 tooth white gear is only for the '93 Cobras. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

08-20-2002, 09:15 PM	#9
todd95GT Registered Member Join Date: Aug 2001 Location: Palm Beach Gardens, Florida, USA Posts: 191	time size and gear ration? what the heck was I thinking? Go with what Hanlon says, which happens to be what Chris says, too. The chart tells you what the ratio is and which pair of gears will bring you closest to optimum. __________________ Todd

08-20-2002, 11:16 PM	#10
SlowGT Registered Member Join Date: Jun 1999 Location: Columbia Co, PA Posts: 303	try this math from the FMS 2002 catalog: (drive gear teeth X axle ratio X tire rev per mile)/1000 = # of teeth on the driven gear. (7 X 3.55 X 815)/1000=20.25 ==>black 815 is rpm for a 225/60-15. TireRack has pretty good info for finding rpm for your particular brand/size. for T-5: 21T = red 20T = black 19T = pink __________________ Old Slow GT New Slow GT--> under construction Latest Addition: 95 Cobra R, #73, bone stock, ~6100 miles.

08-21-2002, 07:44 AM	#11
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	So is this why when I took out my old T-5, the speedo gear (the white 23T one) was all chewed up? The shop that installed my gears (does a ton of gear swaps for Mustangs) said that the white gear was the proper one and installed for me. What crap that is. So, if my Tremec is a 6 tooth drive w/3.55 and 815, I get 17.3595. So, do I have the wrong gear? (I've got the 20T Black gear - That's what D&D told me I needed) Ok, I'm offically confuzzed now! Someone please set me straight. E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

08-21-2002, 08:23 AM	#12
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	OK!! I just went through this mees this morning. listen up. The following trannys have a 7 tooth drive gear: - 1983-1989 T-5 OEM - Pre 1993 T-5 Aftermarket - 1996-1998 Cobra T-45 OEM - All Tremec Transmissions 2.73 Gear Ratio / Maroon 16 Speedo Gear 3.08 Gear Ratio / Yellow 18 Speedo Gear 3.27 Gear Ratio / Pink 19 Speedo Gear 3.55 Gear Ratio / Black 20 Speedo Gear 3.73 Gear Ratio / Red 21 Speedo Gear 4.10 Gear Ratio / White 23 Speedo Gear That means you Harry. You will need a BLACK 20 tooth speedo gear for your 3:55 gears. This may be helpful to everyone else. Manual transmissions with 8 tooth drive gears include: - 1990-1995 T-5 OEM - 1996-1998 T-45 OEM Except Cobra 2.73 Gear Ratio / Yellow 18 Speedo Gear 3.08 Gear Ratio / Black 20 Speedo Gear 3.27 Gear Ratio / Red 21 Speedo Gear 3.55 Gear Ratio / White 23 Speedo Gear 3.73 Gear Ratio / White 23 Speedo Gear 4.10 Gear Ratio / White 23 Speedo Gear __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

08-21-2002, 10:34 AM	#13
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	Thanks for that great info, RPM427 So, I guess I was right with the white 23-tooth gear for a 91 T-5 w/3.55s and the Black 20-tooth gear for my Tremec is correct too. Thanks, E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

08-21-2002, 10:41 AM	#14
todd95GT Registered Member Join Date: Aug 2001 Location: Palm Beach Gardens, Florida, USA Posts: 191	Just a suggestion... use the Hanlon chart at the website and replace the drive and driven gears. Just replacing the driven gear with a 23 tooth to compensate for not changing the other means you'll have a lot of teeth in a small little gear. The 23-tooth gears DO fail. For 23 bucks delivered you can get them both. I just ordered a 6 and 19tooth set for my upcoming swap to 4.10's. __________________ Todd

08-21-2002, 02:35 PM	#16
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	I just spent 45 minutes trying to get the 23 tooth gear locally. Ford only makes gears up to 21T so don't anyone waste thier time trying to get one in a auto parts store, it looks like steeda is the only option __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

08-21-2002, 04:00 PM	#17
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	You can get them from D&D Performance too. You can reach them at (248) 926-6220 or on the web at www.ddperformance.com They have a speedo gear chart there too! What's interesting is that they comment on the white 23T gears stating that they are not a Ford gear and therefor don't mesh perfectly with the tranny drive gear. Thus, they can become stripped - which is exactly what happened to me with my old T-5 setup. Hope this helps, E __________________ 1991 5.0 LX Coupe - 40,750 miles 331 cu. in. / Tremec 3550 / BFG Drag Radials 12.22 @ 114.31 mph - w/1.89 60'

08-21-2002, 07:43 PM	#18
RPM427 Registered Member Join Date: Aug 2001 Location: Huntington NY Posts: 573	My speedometer and trip meter is working fine, but after seeing what the gear looks like while I am doing the clutch, I don't understand it. It is all chewed up. __________________ -1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway -1994 Ranger w/ 427cid windsor (daily beater) check it out!

08-22-2002, 07:30 AM	#19
Harry Registered Member Join Date: Oct 1998 Location: Dayton, OH USA Posts: 678	RPM427, thanks for all the info. I am sure a lot of people will be helped by all of that. Mysweetlx, no I don't think you are right. According to RPM427's chart, and also the Hanson web site, I need the black 20 tooth speedo gear. I just dropped my mustang off at the shop today to have the gears changed. Going from a 2.73 to a 3.55 should be a great improvement! I can't wait to get it back and see how it does. Thanks everyone. Harry __________________ 1985 Mustang GT 2002 F-150

Thread Tools
Show Printable Version Email this Page
Display Modes	Rate This Thread
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode	Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Another Speedo gear question	kdog	Windsor Power	0	03-07-2003 04:18 PM
The Right Speedo Gear...	Titan	Modular Madness	8	09-23-2002 05:42 PM
speedo gear	redrider	Windsor Power	1	01-17-2002 10:06 PM
Speed compensator vs. Speedo gear?	5.0PiMpin	Windsor Power	4	01-13-2002 10:01 AM
Tranny speedo gear question	Alex89GT	Windsor Power	1	07-20-2001 06:26 AM