Technical Speedo sender direction of rotation ?

For a screw on speedo drive:
https://shop.classicinstruments.com/sn17
I used one on my T5

Nick

 

Great info @mr48chevy ! Thanks

 

@nickleone, that’s exactly what I have. The problem is going from that to the cable requires a 90* adapter to clear an exhaust pipe. I’m thinking that’s where my problem is
Thanks

 

I think you can find a far better price but something similar to the 90 degree box is what you are looking for. PATC GM Transmissions, TH400, 700R4, 4L60E, 4L80E, 6L80E & others (transmissioncenter.net)
As search for 90 degree speedometer sender adapter for Chevrolet (if you have an S-10 trans) should bring a few up.

 

Lot of great information in this thread that will be helpful to a bunch of folks.

 

For sure ! Thanks guys

 

I'm still curious which way the cable turns, if it turns at all, when you disconnect it from the speedometer, and drive the car forward, and you look at the speedometer end of the cable.

That is the first test I would do to figure out what is wrong with your speedometer.

 

Thanks @squirrel, I have the afternoon today to mess with it. I’ll try that first. Update later

 

you might fold a short piece of tape over the end of the cable, like a flag, so you can see what it's doing more easily.

 

Good idea !

 

Test one, cable has no motion when driving.
I’m going in !

 

Don’t know how this happened but the gear itself is stripped inside where it engages theSo it’s slipping. Don’t know how it got damaged, there in is the answer

 

It might be that it's too hard to turn the 90 degree adapter and cable. Can you turn the square shaft by hand easily, when the cable is connected at both ends, the adapter is in there, etc?

btw it looks like you have a Ford transmission. Info such as that is something that I would not assume....it's good to let folks know what exactly you're working on.

Ford speedometer gears can be fun, because they made them with different setups over the years...some have the teeth slanted one way, others have them the other way. If the transmission shop set up all that stuff, hopefully they did it right, and the problems you're having are just the result of the 90 degree thingy causing too much drag. But who knows...

 

Ford speedo driven gear info, gear pitch is opposite the side of the trans that it comes in on.
Right hand pitch is most common, left hand pitch was usually only on Top Loaders where the speedometer cable location is on the passenger side.
I'm a GM guy but will give credit where credit is due. Ford brought the speedo cable in on the passenger side of the Top Loader and other 4 speeds so it wouldn't interfere with the shift linkage.GM/Muncie /Saginaw however brought most in on the drivers side right through the shift linkage, which makes it a pain in the ass to get to the speedometer driven gear and wont let you install a speedometer ratio adapter direct to the driven gear sleeve because of the linkage. So you have to split the speedometer cable upstream and put it inline.

 

Thanks for that, was able to look down the hole in the Trang with a mirror, the gear looks fine, pitch was towards the rear.
I re tested the speedo, working fine alone. I have to check the pitch on the driven gear to see if they mesh.
I thought if there was resistance from the speedo things could get jammed but there isn’t any

 

Well the drive gear is messed up. I can rotate it in both directions with my finger. Tranny guys said it shouldn’t. Looks like an electric sender and a cable converter box.
Thanks to all who tried to help

 

Chuck the cable in a drill and run it gently to find out. Try counter-clockwise first.

John

 

Did that, speedo works in a counterclockwise rotation

 

Do you mean the drive gear that's on the output shaft of the transmission, is turning when the shaft stays still?

 

Yes Jim, unfortunately. Does the electric sender work off the same drive gear ? If so, the app on my phone’s gps will work

 

I’m gonna assemble the whole thing with the new gear and see what happens, got nothing to loose at this point

 

Or fix the transmission? I don't recall what holds the gear on in those transmissions...but a quick google search shows there is a spring clip in the gear? is it there?

 

I’ll get in touch with Modern Driveline. I got this all from them. Been bugging the crap of one guy, maybe I’ll wait till tomorrow about that.
Thanks

 

Can’t see the a clip on the gear looking down the hole.

 

Sounds like they forgot to put the clip in, or it lost out. Can you pull the tailshaft with it in the car and put the clip in?

 

Could be. It might be possible, haven’t really thought about yet

 

Not on a T-5 to my knowledge. The trans has to be out and on the bench as the shift tower is part of the tailshaft housing

 

OK. I thought he had an automatic for some reason....

 

Have to apologize you all of you who tried to help me. This 71 year old brain forgot that on my first drive, the speedo worked until I accelerated. Afterwards, I checked out the cable and found the ‘sender’ had popped out of the tranny about 1/4”.
Modern Driveline told me that when that happened the driven gear probably got wedged and stripped. He doesn’t think the drive gear in the tail shaft is damaged. I could only touch that gear with the end of my finger and with tranny fluid I’m not sure if it’s turning or my finger is slipping.
New gear arrives tomorrow and I’ll reassemble and test.

 

Update. Got the new gear. Assembled everything checking to see if everything turns easily. When I put the sender in I rotated the gear back and forth slightly until it felt like the gears meshed. The good news is there was resistance once they meshed, so I think the drive gear is ok. The clamp was a little bent to I took of that and made sure it was tight. Added the 90* adapter and checked the rotation. It wouldn’t turn which makes sense as the gears are meshed. Finally attached the cable. I made a heat shield to protect the adapter. Test drive tomorrow, feel optimistic. We’ll see .