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					Originally Posted by Lang  Mike K
 I had a 1948 Landrover when I was a kid and the yellow knob lever had to be pushed down to get reverse in four wheel drive.
 
 
 Lang
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 Lang
Your 1948 LR would have been a late 1950 model see here: Early land Rover chassis numbers begin with the model year eg   8 = 1948   0 = 1950  1  = 1951 
https://www.aulro.com/afvb/attachmen...se-changes.pdf
There was a short production run where the later 1950 models had the free wheel system locked for reverse by a  yellow knob control. Before the yellow knob, the 1948 to 50 models had a chain through the floor panel with a ring pull , rather like an old dunny chain !