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Friend has one that someone replaced the engine with the diesel engine out of a passat, engine died as the gearing didn't match the engine so the engine was over revving alot. Now has a passat 4x4 diesel engine and gearbox fitted on a subframe...so far has taken 10 or so years and was bought to go camping in with his then young wife and child.
Think I have slept in it, whilst on the drive, more than them.
The limiting factor off-road with the T25 Syncro was that there was no selectable low range final drive on the gearbox so you had 1st gear and that was mostly it. So I was told years ago anyway.