Technical Speedo sender direction of rotation ?

Maybe someone can help me with this. I have a T5 with a mechanical speedo. Here’s the question, which direction does the speedo sender rotate while driving forward. In other words, which way is the cable rotating ?Clockwise or counterclockwise ??
Trying to make my speedo work.
Thanks guys, appreciate the help

 

back up to the top

 

when you look at the transmission, so you see the end of the driven gear that the cable fits onto, the gear will rotate clockwise...which, incidentally, is the same direction the speedometer rotates. That makes it easy to remember, eh?

 

Thanks @squirrel, problem is the speedo works counter clockwise. If the cable is rotating clockwise, I can use a reverser adapter.
So you’re saying it’s rotating clockwise, eh ?

 

Thanks Don…

 

I'd need more info about the speedometer, because those used in American cars generally all turn clockwise...but yeah, you might need to reverse it. And you might check the ratio it needs...almost all American speedos are set up for 1000 turns per mile, but there are others in the world that are different.

But also the direction you are looking at things makes a difference. I always look at speedometer and cable and gear direction as if I were looking at the face of the speedometer, and it's always clockwise. Not the back side of it...that makes it counter clockwise

 

When I spin the cable counterclockwise with a drill, the speedo works.

 

I had no problem adapting a 700R4 to drive a stock Model A speedo.
What speedo are you using?

 

It’s from a 1934 Chrysler rebuilt with new parts by a pro. You’ll have to zoom in..

 

I know it’s strange but as the cable loops around to the speedo a counterclockwise rotation turns into a clockwise rotation as it enters the back of the gauge
Eh ?

 

CCW cable rotation is correct for most American speedometers.

 

My 3-year-old Stewart Warner “Wings” speedometer turns counter-clockwise and is driven correctly by my 700R4 transmission.

John

 

Possible that the transmission has the wrong speedometer drive gear installed.

 

I have a reverser adapter, gonna try that and see if it works, otherwise it could just be the gear in the tail shaft

 

Have you driven the car? Or just played with a drill, and gotten confused?

 

I drove it plenty, at first it worked for a maybe 30 seconds but jumped around, then stopped working. I have re installed and checked the adapter and the speedo gauge a few times. Only clue is the driven gear was damaged slightly on one tooth when I took it out.
If in fact it is a clockwise rotation out of the tranny, a reverser adapter should work

 

The direction the cable rotates, depends on which end you are looking at it from. As I said in my first post, if you are looking at the transmission, the gear will turn clockwise. If you are inside the transmission looking out, as if you were holding a drill to turn the cable, it will be counterclockwise.


Tell us about the gears in the transmission. (there is no "sender", that is something that is used with electronic speedometers, not mechanical ones). Did you or someone else change the driven gear that fits into the side of the transmission? Did you or someone else change the drive gear or reluctor wheel on the transmission output shaft? If the transmission originally used an electronic speedometer, and you put a gear in there, things could be screwed up.

 

Ok, the ‘sender’ is a stock part that goes into the tranny. Has the driven gear on one end and a cable interface on the other. It’s a new tranny with the drive gear installed. The ‘sender’ was sent with the tranny with the correct driven gear. The driven gear is 19 tooth. I need to use a 90* adapter to connect to the cable cause there’s no room in a Model A. The way I understand it, you can use either mechanical or electric on this tranny. All from Modern Drivetrain.

 

That’s Modern Driveline

 

Check the rotation of the 90 degree adapter, input side and output side. The adapter rotation can also be reversed.

 

Just did. Thanks

 

Ok...you are using a gear, but referring to it as a sender. Makes no sense to me. A sender sends an electrical signal A gear turns a cable.

I hope you get it figured out. Having all this information, finally, does help folks help you.

 

The cable turns "clockwise" when it leaves the drive gear on the transmission.

It is still turning clockwise when it gets to the back of the speedometer in the dash but that now is "counter clockwise at the back side of the speedometer
The speedometer does turn counter clockwise when you look at it from the back but turns clockwise when you look at it from the front.

Ever stand under a car running in gear on a hoist? If you look at the transmission end the shaft is turning clockwise if it is in a forward gear but turn around 180 degrees and face the rear axle and the shaft appears to be turning counter clockwise.

 

Chucked my cable in my drill to make sure my speedometer worked, had to run the drill in reverse to make it work. Hooked it to an adapter fitting I bought from Midwest Ford parts that allowed use of a screw on cable on the AOD transmission, it works fine. I couldn't use the later style cable because the Lincoln speedometer has a female end the cable screws into instead of the male end the cable screws on to.

 

What would you call the part that goes into the tranny and engages the internal gear with a cable attachment one other side ?

 

An adapter?

 

The T5 with mechanical drive also has a connector next to where the cable attaches for cruise control and other functions. Therefore it is a SENDER. My 93 T5 has a sender and a cable connector.

Nick

 

Here is the SENSOR speedo drive
https://lmr.com/item/LRS-9731BB/mustang-speedo-sensor-hardware-kit-83-93
Nick

 

Just want be accurate

 

The gear it's self is the "driven gear" or drive gear
The piece that holds it in the trans is the "bullet" or speedometer drive gear housing.

This link should give you the info there. Chevy S10-T5 Speedo Gears – GM Speedometer Drive Gear Replacement (allstategear.com)

If you have the gear and housing in the transmission now and they work what I would do is put it together and drive it and use a GPS to see if and then how far it is off both speed and miles. Take the percentage it is off up or down and that is the percentage of gear adjustment you need to make to correct the speedometer if needed.

4x4 shops and most semi truck shops sell speedometer correction boxes that are tiny quick change gear boxes that fasten to the speedometer drive housing with the cable fastening to them. Rather than go into the transmission to change the drive and driven gears to get the correct speed rating you swap out the little gears in the box. Then if you decide your bigs are not big enough or are too big and swap rear tire sized you just calculate what change you need to make, swap gears in the box and go again. If you are out in a wrecking yard with some dead 4x4 trucks you often find one on the side of the transfer case.