I own two 300SDs (and '81 and '82). A few years ago I had to replace the antenna mast on the '82. I had a non-toothed or smooth nylon shaft version of the antenna mast on that car and replaced it with a toothed version. At the time I was led to believe that the toothed version was the only one available. It has performed quite well for me.

I have just replaced the antenna mast on the '81 which likewise had a smooth version of the antenna mast. Again the replacement was a toothed version. The new mast works well except that I get a slight but quick "squoink" noise when the mast goes up and again when it goes down.

Are the two styles of antenna masts interchangeable? Do I need to be looking for a couple of non-toothed style antenna masts? Since both antennas appear to be working well, should I worry about this at all?

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Tom Evans
69 280SE 91K (wish I still had it)
73 220D 98K
78 300D 134K
78 300D 185K
81 300SD 301K (still have)
82 300SD 321K (still have)
84 300D 268K
84 6.2 Diesel GMC Suburban 225K (a whole different story!)