105 Series G/Box failures

Re: the manual boxes in 100 / 105 series Cruisers.

There are 2 manual boxes from what I understand - the R151 which is the smaller Prado box that is slotted in behind the N/A 4.2 1HZJ oiler and the heavier duty H151 box which sits behind the 4.2TD, 1FZ-FE 4.5 six cylinder petrol and 1UZ (?) V8 petrol.

The larger H151 also did stirling service in the old 80 series I believe.

I have never had one fail on me and neither do I actually know anyone who has. My advice is to speak to as many reputable specialist repairers about them as you can and get real life feedback on them. I'd also talk to the hire companies workshops. They must rent out 1,000's of the 1HZJ 105 Landcruisers a week which they get mercilessly caned for their entire life. If they're gonna break, that's where it will happen. "Don't be gentle....it's a rental!"

The internet is full of horror stories that can ruin your next trip with fear if you let it. Take it all with a pinch of salt and carefully form your own opinions. Remember, ANY vehicle will go bang if driven stupidly.

The other option is to buy a live-axle petrol model. They seem to be the only recent models in either Landcruiser or Patrol that don't have engine / drivetrain issues with something or other. (note - 'live axle')

Got a member of the local 4wd club that has replaced/repaired the gearbox in his 1HZ GXL 100 twice now, owned it since new, does tow a camper and a few kids as well so reasonable load. Mostly urban running though, stay out of 5th when towing except downhill and easy flat running without a load.

Perhaps you blokes might be able to enlighten me alittle more
What actually fails in these boxes?
Ijust traded a 3.0td patrol with a dodgy engine on a GXL4.2 100 series 11/2002 model 70000 ks
Haven't even picked it up yet,now I read this !!!!
Not out of the frying pan into the fire I hope?

The problem is the input shaft is about the thickness of a finger. No easy fix I'm afraid.

Look at petrol as an option and no, I'm not joking. When is the last time you've heard or read of a problem, any problem at all, with a petrol 105 / 100 Landcruiser 4.5 or 4.7 or the GU Patrol series I, II, III or 4 in either the 4.5l or 4.8l? Do a forum search for petrol problems then do the same for diesels with the endless supply of 3.0l ZD30 engines blowing up, overheating and uncurable 4.2TD Nissans, 1HZJ105 gearboxes, 1HZJ injectors and power steering pumps etc.

This is 2005, not 1985. Many of the diesel arguments just don't stack up like they used to.

Petrol pro's: Cheaper to buy, more reliable, cheaper to maintain, more power, quieter, smoother, the strongest drivetrains fitted as standard for each model.

Petrol cons: Uses more fuel but cheaper per litre, may suffer from water ingress but so do modern fly by wire, electronically injected, airflow sensored diesels. Better torque but I'll still put my petrol Cruiser up against any N/A 4.2D for towing anything you care to mention.

Either way, it don't worry me none, I own both - but it is food for thought.

I have a standard model 100 series 1hz mainly use it to tow a 1.5 ton van its done over 200000 klms and ive never had a problem with it. I also work in the coal power stations were the things are everywhere and have only heard of a couple blowing reverse from being flogged from first to reverse when bogged its like most things dont abuse them, service them properly and there fine.