True - I was [briefly] a CE Techie in REME in the late 1960s, based at the RAC centre at Bovington. I remember following a squadrom column lin line down to the nearby ranges, and how a Chieftain would often mis-gearchange withing half a mile of starting up, bringing it to a halt [third to reverse in a tenth of a second is not good on a 60-ton tank]. It was a simple one-minute fix but took three hours to achieve due to the crap that had to be moved out of the way to get to the selector linkage.
Apart from the total sh!te engine, it was a good tank, and was a sure-fire opposition killer. The 120mm penetrator would clean both sides of a T-62 hull at 1500m....or in the glacis and out through the engine bay.
tac