my speedometer is bouncing while driving

Check your trans fluid if dark brown replace it and then check speed sensor have a trans guy look at it you my have a bad clutch seal or clutches.....

hmac300, Thanks for your help. I recently had the transmission overhauled but they didn't replace the vehicle speed sensor. Which I believe is located under the car on the bottom of the transmission? There is also a transmission speed sensor. I'm not sure which speed sensor to replace. Could you advise ? I appreciate it. I will check the wiring on each one. I live on a gravel road with lots of bumbps and holes so maybe something came loose. Thanks again, Mike

it should be your vss (vehicle speed sensor) it's item 4 on the pic i'm including. the other is item 13.

Thanks for the help. I apologize for my confusion, but the item #4 is a wire harness attached to the PCM. I think. The actual VSS is located elsewhere as I am trying to figure out. I have read and believe I need to jack up car put on stands to gain access to VSS??? Thanks again hmac300! Greasy Mike from Ferndale, Michigan

it may be item 13 then instead if 4 is just a harness connection. you should be able to reach that from the top.

I found the vss and fixed the problem. The insulation on the wires where they meet they wiring harness had melted and the wires were touching. Must have created a short and confused the on board computer. anyway the car runs fine no more speedometer problems. Thanks to all who helped me. greasymike