All 1Hz (and 1Hd) engines are known for premature big end (conrod) bearing wear. 1992 and earlier engines are the worst, but it is still a problem with HZJ78 and HZJ105 engines. Listen for bottom end knock, especially at start up. If the bottom end knock gets out of hand it can spin a bearing, meaning new crankshaft and conrod/s. Major engine rebuild in other words. If I was planning to drive a long way, I'd replace the big end and main bearings, even if I couldn't hear any knock.
Several years ago I drove a HZJ105 Landcruiser up Cape York (northern Australia). It had an aftermarket turbo kit on it with an intercooler. I thought it was inferior to my Y61 Nissan Patrol with 3 litre ZD30 turbo diesel engine in every way. Power, torque, fuel economy, suspension performance off-road, driving position, manual gear shift quality. Patrol was also better on corrugated roads but that is more dependent on shock absorber selection than anything else.
A HZJ78 without a turbo would be like driving a car from the 1980s. Actually a 1986 HJ60 with 12HT would be better. A lot of people who are used to driving "modern" cars would get pissed off at the lack of power, not being able to keep up with traffic up hills, having semi-trucks (which are speed limited to 100km/h in Aust.) tailgating you on the highway etc..
Also Troopies are tall, heavy and have a very narrow track for their size and weight - a recipe for roll-overs. Some drivers tend to carry a bit too much speed into corners, because if you slow down for the corner, you have to accelerate after the corner, and with the 1Hz acceleration is almost non-existent. Be very careful about how you pack your gear with a HZJ78, don't overload it, and place the heaviest items as low as possible.
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