I'm assuming you have a Flexiride axle
which was made by a UCF liscensee. Torflex is the name that Dexter uses for their axles which are not adjustable as far as I know.
I installed a 2000 lb. Flexiride axle under my 1977 Scamp
recently and last weekend heard it squeaking as I passed over speed bumps along the front of a grocery store. Here is what UCF says in their Frequently Asked Questions paper:
FLEXIRIDE® – My Flexiride® suspension makes a squeaking noise in function. Why?
This only happens when the Nylon bushing used as a bearing is pressed tight against the cartridge shaft;
the friction will induce vibrations and create a high pitched noise. As a consequence of the issue that a
few licensees have experienced with the Flexiride® bushings squeaking, we have made some changes to
eliminate the problem:
1. We have changed the bushings material from Delrin to Nylon 66 with Teflon. The new material allows
less friction than the Delrin.
2. We are using a new reaming machine to ensure that there is no chatter and the hole cleans up
perfectly. This prevents debris and particles from lodging themselves in the bushing.
3. The use of a retainer plate to hold the bushing in place instead of rivets also helps the bushing move
freely and reduces the chance of squeaking.
Testing and field study have shown that these changes have been effective in eliminating the squeaking.
However, if you experience this annoyance, you may eliminate the noise by removing the Flexiride® arm,
and spraying some Silicone lubricant between the bushing and the shaft. Do not use any petroleum
compound, since this will damage the rubber in the cartridge. If the noise persists, you will need to have
the unit replaced by the Flexiride® licensee that provided it to you.
I remembered reading this before and just now read it again since it applies to me also. I don't hear the squeaking when I'm driving down the road. I only heard it this one time as I was close to a building where the sound could bounce off the walls. It doesn't bother me yet.
I've included a picture of the splined shaft with the adjustable arm removed. I might get some silicone lubricant and spray it in there to see if it helps.