Hey Guys, I was out cruising the other day and my speedo and odometer stopped working. I'm somewhat of an amateur mechanic, can you let me know what to look for so that I can fix the problem. Do you think this would be an easy repair or difficult?

Sorry, should have said Hey Guys and Gals as I know there are some ladies out there who are quite knowledgeable.

first thing to look for...the cable...might be broken...find it on back of speedo , undo both ends (other at transmission) turn and see

Finally had a chance to pull the speedo cable off. I removed the cable from the tranny, turned the cable by hand about 100 times and then noted that the odometer did change, thus I assume the cable is capable of spinning at the instrument panel. At this point in time, I am not certain if it is engaging while in the tranny. Thoughts?

Actually the much easier way is to chuck the tranny end of the cable into your favoritre drill and then spinning the cable. You should see both the speedo needle and odometer move.

If it's not a broken cable, then you need to check out both the plastic drive and driven speedo gears in the tranny. Is the end of the cable set properly into the end of the driven gear? Are the teeth on the drive and driven gear OK?

Which tranny BTW?

Not sure what type of tranny, other than to say it is an original 400 1968. I took a pic of the end of the cable that goes into the tranny, but having issues with file manager, it's a 1.95 mb file, not sure why it won't except it. I would assume the issue is something internal in the tranny.
I will find out what type of tranny it is and then try to source parts. When I attempt to take the parts out of the tranny, do I need to drain the tranny first, i.e., will the tranny leak fluid when I try to take the parts out.

Let's assume you have the entire factory drivetrain, and you have an auto tranny, then you would have a Turbo 400 like I do.

At the end of the speedo cable, you will see a round "plug" in the driver's side of the tail end of the transmission. That plug is held in place with a metal clip secured with a bolt. Remove the bolt and clip and wiggle the "plug" back and forth a bit while pulling it out. It's a tight fit and sealed with an "O" ring. That plug is the housing for the driven gear. It just sits in the housing. You can pull it out and make sure the teeth are not stripped and the shaft of the gear (that turns the speedo cable) is not broken. A small amount of tranny fluid will probably want to seep out with the housing removed so be ready to catch it with something.

The drive gear is a round "hoop" like structure inside the tailcone of the transmission and cannot easily be removed for inspection. You can see a small section of it with the driven gear housing removed.

ok, thanks for the info, I will give it a shot.