Speedometer gear

[A110235]

I went for a drive this weekend and my new speedometer didn't work.  I disconnected the cable from the 4-speed and I can spin it with a drill and it reads right at the gauge.  What would be the problem in the transmission?  I took the retainer off and started to pull the housing where the cable connects at the trans when I discovered it was a really fast way to empty the all the fluid.    What will be the fix for this?

Kyle

[67vertman]

It is just a plastic gear inside, it could have broken or is stripped, and yes removing the speedo gear will drain most the fluid from the trans, I found out the same way you did. 

Put a drain pan under it to catch the fluid, if you want to reuse it.

[A110235]

Ok, thanks for the info.  I assume they are still available, where can I get the gears from?  And how do I know which one I need?  Isn't there some formula for which one I would need based on tire height and rear gear ratio?  I'd say it is a pretty slim chance that I have the correct one where my speedometer would read right.

Kyle

[Chryco Psycho]

The speedo drive has to be clocked so the gear will mesh properly with the output shaft .

[A110235]

I'm not looking at it now, but I remember the two prongs of the retainer seated in two little notches in the body of the housing.  Maybe it is 180* out?  Is there anything that helps to show what the proper alignment is? 

Kyle

[Chryco Psycho]

Yes , the housing has 3 group markings for different tooth counts so it has to be clocked according to the tooth count

[67vertman]

This helps a lot in slecting the right gear to pinion ratio

http://www.moparts.org/Tech/tech/pages/speedo.html

[A110235]

Sweet!  Thanks for the info guys.

Kyle