Another .. speedo problem

[Nathan]

Well, the dang speedo died .. again. This time - different cause. The gauge and cable are fine to spin by hand, but I removed the 90 degree looking device from the tranny where the cable plugs in, and it doesnt appear to spin. What is this part called?? I cant find one. As I recall, they are all supposed to be different based on gear ratios and engine. The cap on one end displays the ratio inside it. But I dont remember what this part is called, and have no clue where to find one. Any thoughts? The tranny is a TH350 off of some earlier year chevy car. Thanks for any help.

[19_Chevelle_69]

Have you removed the speedo drive unit from the tranny itself? I've seen the nylon gears strip right out of the tranny.

There is a thread here that has a picture of the speedo adapter that you are referring to. I believe it was your first "Speedo Problems" thread...

Here's a link with some info for you...
www.gaugeguys.com/ratioadapt.htm