Turbo Hydra-matic tranny speedometer not working

[cppursell]

Hi everyone, I'm hoping you can help my dilemma.

Ever since I've had my '67 Chevy C10, the speedometer hasn't worked.

I'm pretty sure I have a 350 Turbo Hydra-matic transmission.
I looked under the truck and I noticed that the speedo cable is attached to this box-looking device which connects to the transmission. I thought that was just a third-party gear reducer or something, but it seems to be part of the transmission, 'cause if I take that away, there's no way to directly connect the speedo cable to the tranny. Looking at the box-thing, there seems to be a missing part inside the end that plugs into the tranny, and that's probably why the speedometer doesn't work.
Are you familiar with this box device, is it part of the transmission, how can I fix it?

I hope I was clear enough...
I don't know what I need to get the speedometer working, but if you can give me any pointers, that'd be great.
Thanks!

[gcburdic]

First welcome from NC...to the best board on the internet!!!

here ya go...this should be a great help to you! http://67-72chevytrucks.com/vboard/s...d.php?t=345091

You may need to change the speedo gear housing gasket or the housing and the driven gear....good luck

[cppursell]

OKAY! I notice on that great article you sent me to, that my box converter thing replaces the original speedo thread connector! Okay, so I just need to get one of those original connectors, get the speedometer working again, then determine what gears I need to adjust.

Thanks for your help gcburdic!