I’ve went in circles trying to find this high pitched squeak with no luck. I had used silicon grease on every bushing under the UMI Suspension System. There are a lot of zerk fittings using this type of tubular suspension and some of them are fairly well hidden from casual view. One good note all fittings were accessible with my particular grease gun that does not have a 90 degree angle.
With the expertise of my mechanic friend Dave he found the source of the squeak in less than 5 minutes. I guess I have a lot to learn still.
The culprit was the top washer end cap for the driver side Viking shock system. You can see in the photo where it makes contact with the frame.