My adjustable upper trailing arms

[LsxBuickRegal1982]

Now that I look at the design that makes a lot of sense

 

[565bbchevy]

Now that I look at the design that makes a lot of sense

The on car adjustable uppers need jam nuts to lock the adjuster from turning which could move and throw it out of adjustment,

 

[bracketchev1221]

Jam nut is a structural device that permanently loads the threads and keeps it from hammering on the threads. It has nothing to do with locking it in place from turning.

 

[LsxBuickRegal1982]

Jam nut is a structural device that permanently loads the threads and keeps it from hammering on the threads. It has nothing to do with locking it in place from turning.

So same philosophy as a tie rod