The 450SLC uses the 722.0 transmission, which unlike the later models has an adjustable B3 band (which is used for engaging reverse).   This was not something I was aware of, but I was able to find threads on various Mercedes forums outlining how people who had similar issues had been able to adjust this band to cure them.   I wonder how many perfectly good cars were junked instead of trying this simple adjustment?

This can be accessed from under the car, on the drivers (RHD) side.   There is a bolt that can be tightened up to adjust the band.  It is quite hard to get to and you can feel it more than see it.

The photo above shows a socket on the adjustment point.   So far the B3 band adjustment seems to have worked, I’ll see how it goes over the next few weeks.

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