Tranny Speedo Gear...What's Needed?

94GTLaserRC · Dec 21, 2005

Since my speedo AND odometer are both not working, I was thinking it may be the tranny speedo gear (not even sure if I have the verbage right). Where is this, and is this fixable at home in the garage, and how do I go about, basically, Im with respect to this issue, so any help would be appreciated.

Thanks
RC

urban96 · Dec 21, 2005

it might be your VSS (vehicle speed sensor) the tranny speed-o gear is connected to this.

basically 1 9 or 10mm bolt holds this inplace, its on the drivers side of the trans near the tailshaft. simple to remove

94GTLaserRC · Dec 21, 2005

urban96 said:
it might be your VSS (vehicle speed sensor) the tranny speed-o gear is connected to this.

basically 1 9 or 10mm bolt holds this inplace, its on the drivers side of the trans near the tailshaft. simple to remove

What about "where" to get it?

Hey, what's up with the copy machine avatar
RC

urban96 · Dec 21, 2005

50resto has them

http://www.latemodelrestoration.com/iwwida.pvx?;item?item_no=LRS-9731A 1&comp=LRS

the avatar... i dunno why i picked it

*edit direct link isnt working but part# is LRS-9731A

94GTLaserRC · Dec 21, 2005

Hmmm....Says the page cannot be loaded
RC

94GTLaserRC · Dec 21, 2005

Nevermind...I saw your edit with the part number

Thanks!!

How do I know if I should replace it?

RC

bill302 · Dec 21, 2005

heres a sensor click on link
http://www.partsamerica.com/ProductList.aspx?parttype=1179&searchfor=Speed+Sensor&ptset=A
heres a speedo gear
http://cgi.ebay.com/ebaymotors/Ford...ewItemQQcategoryZ46104QQitemZ8023987200QQrdZ1
and heres some info you might find interesting scroll down to speedo gear section.
http://www.corral.net/tech/drivetrain/gears.html

urban96 · Dec 21, 2005

i would first remove it and see if the gears chewed up (its attached to the end of the sensor) if the gear is fine i would replace the sensor

bill302 · Dec 21, 2005

urban96 said:
i would first remove it and see if the gears chewed up (its attached to the end of the sensor) if the gear is fine i would replace the sensor

i copy.

94GTLaserRC · Dec 22, 2005

Thanks for the help guys...

Those links are Bill!!

RC

Black95GTS · Dec 22, 2005

94GTLaserRC said:
Since my speedo AND odometer are both not working, I was thinking it may be the tranny speedo gear (not even sure if I have the verbage right). Where is this, and is this fixable at home in the garage, and how do I go about, basically, Im with respect to this issue, so any help would be appreciated.

Thanks
RC

How are you doing correction for speedo with your 373s if you didn't swap the gear? The normal corrective gear for that ratio is a 23 tooth chrysler gear that does not mesh and will eventually wear down, resulting in the symptoms your describe. I know for the T5 if you go above 327s you are not using a ford part for a corrective gear anymore... I'm not sure if its any different for the AODE.

my .02

Adam

94GTLaserRC · Dec 22, 2005

Black95GTS said:
How are you doing correction for speedo with your 373s if you didn't swap the gear? The normal corrective gear for that ratio is a 23 tooth chrysler gear that does not mesh and will eventually wear down, resulting in the symptoms your describe. I know for the T5 if you go above 327s you are not using a ford part for a corrective gear anymore... I'm not sure if its any different for the AODE.

my .02

Adam

A shop did my gears in like 1996. They put the correct gear in. It's just now, the odometer AND speedometer are both NOT working.

RC

bill302 · Dec 22, 2005

read this quote from black95GTS.(The normal corrective gear for that ratio is a 23 tooth chrysler gear that does not mesh and will eventually wear down, resulting in the symptoms your describe. I know for the T5 if you go above 327s you are not using a ford part for a corrective gear anymore... )
the gear you buy does not fit perfect its something all stang owners deal with when changing gears and installing speedo they wear out over time. more than likely the plastic speedo gear is stripped, pull it and see if it is. let us know. also odometer will not work if speedometer doesnt work unless the speedometer guage itself was broken.and viseversa.

final5-0 · Dec 22, 2005

For me to tell you how many years my 23 tooth gear has given me trouble free service would be some what misleading as my Stang is mostly a week end toy.

however

I have put about 15k on the clock with that gear and no probs so far.

Maybe that will give some perspective here!

Grady

bill302 · Dec 22, 2005

final5-0 said:
For me to tell you how many years my 23 tooth gear has given me trouble free service would be some what misleading as my Stang is mostly a week end toy.

however

I have put about 15k on the clock with that gear and no probs so far.

Maybe that will give some perspective here!

Grady

now that since you said that it will go out next week.LOL

84convertablegt · Dec 23, 2005

isnt the highest you can go with a t5 a 3.55 without changing the drive gear? just wondering considering im floating on 3.55 or 3.73 and the determining factor for me could be just this info.

v6v8swap · Dec 23, 2005

RC, I have heard of the 23 tooth gear wearing down also. It's not a perfect match to the drive gear in the tranny, so it will eventually wear out. It sounds like you've got the right idea to check the gear itself first (and replace it with one that matches what is in there now) and then suspect the VSS if the gear is good or speedo doesn't work after the gear change (both the gear and VSS might be bad). You might just be lucky and be able to find that the plug on the VSS is loose or just needs to be reseated. Good luck and happy hunting.

Phil

Black95GTS · Dec 23, 2005

84convertablegt said:
isnt the highest you can go with a t5 a 3.55 without changing the drive gear? just wondering considering im floating on 3.55 or 3.73 and the determining factor for me could be just this info.

The highest you can go, and still use only Ford speedo gears, is 3.27s. The highest you can go and use that 23 tooth Chrysler gear mentioned above is the 3.55s.

The 23 tooth gear in the 3.73s will be off by a couple percentage points.

Bill302 - I don't know where you got your info, but I've never heard of a Ford replacement gear having premature wear. I researched the hell out of this because my car came with 3.27s (wife wanted more oomph on the highway in 5th so the husband put in 3.27s for her) and I wanted to make sure my speedo / odometer were dead on. (They were, he did it right.)

Adam

final5-0 · Dec 23, 2005

84convertablegt said:
isnt the highest you can go with a t5 a 3.55 without changing the drive gear? just wondering considering im floating on 3.55 or 3.73 and the determining factor for me could be just this info.

Using the 23 tooth gear doesn't have anything to do with which ratio is used as far as working or meshing up to work with the original drive gear.

IIRC, a 21 tooth gear is used with 355's and it is very close.

The drive gear will work with the 23 tooth driven gear whether it be 373's, 390's or 410's.

The amount of accuracy will decrease with the 23 tooth gear the farther from 373's you go but, it will still work.

As some have said, the life of that driven gear may shorter due to it not having a perfect mesh with the original drive gear.

Grady

bill302 · Dec 23, 2005

Black95GTS said:
The highest you can go, and still use only Ford speedo gears, is 3.27s. The highest you can go and use that 23 tooth Chrysler gear mentioned above is the 3.55s.

The 23 tooth gear in the 3.73s will be off by a couple percentage points.

Bill302 - I don't know where you got your info, but I've never heard of a Ford replacement gear having premature wear. I researched the hell out of this because my car came with 3.27s (wife wanted more oomph on the highway in 5th so the husband put in 3.27s for her) and I wanted to make sure my speedo / odometer were dead on. (They were, he did it right.)

Adam

adam i can't find where i said anything about ford replacement gears having pre mature wear. i did quote you saying,
"read this quote from black95GTS.(The normal corrective gear for that ratio is a 23 tooth chrysler gear that does not mesh and will eventually wear down, resulting in the symptoms your describe. I know for the T5 if you go above 327s you are not using a ford part for a corrective gear anymore... )
the gear you buy does not fit perfect its something all stang owners deal with when changing gears and installing speedo they wear out over time. more than likely the plastic speedo gear is stripped, pull it and see if it is. let us know. also odometer will not work if speedometer doesnt work unless the speedometer guage itself was broken.and viseversa."

in this statement i was refering to the 23 tooth gear.but if i said ford replacement gear in the past i made a mistake and meant the 23 tooth chrysler gear you were refering too.

anyway RC have you found the problem yet.

Tranny Speedo Gear...What's Needed?

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