Things have got in the way over the last week or so, but I've made some progress.
I've read a lot about the problems caused by lack of lubrication getting to the mainshaft between the LT77 gearbox and LT230 transfer box and as there has always been a lot of slack when taking up drive I decided to check what state mine was in. It's a very easy job - just take off the PTO cover (which should apparently be enough to view any wear but I struggled to see anything), then pull off the retaining collar that holds in the input gear.
Then you pull out the input gear and cheer as you discover that it's the cross-drilled one that allows oil to get to the splines. I thought these were an aftermarket modification but it's possible it was factory fitted or maybe changed by the previous owner.
This is the inside of the gear, showing lovely sharp lines where the splines fit onto the mainshaft.
And this is the mainshaft, looking as good as the day it left the factory (sorry to go on about this but it's so much better than I imagined I'm determined to make the most of it!) On the down side it would appear that the drivetrain slack is due to play in the diffs, particularly the front one. Something to look forward to.
Even though the gearbox seemed alright when I was driving it (a decade ago) there is a load of oil and dirt smeared all over one side of it. The other side is clean(ish) and there's nothing on the chassis rail so it's not been thrown up by the front prop spinning. I'll have to have a look at the gaskets and seals once the gearbox is off.
This is the state of the tub where it meets the steel bar that connects it to the front of the chassis/bulkhead (can't remember exactly). I think it's mostly sandwiched between the seatbox and the mounting so I might get away with just cleaning it up and putting a strip of thin rubber between the steel and aluminium when I reassemble everything.
Lots of sheared bolts later and the rear tub is free! With more galvanic corrosion where the tabs bolt on to the tub. I'll have to look at the best way of tidying this up as the new chassis will have a TD5 rear crossmember, which seemed a good idea at the time but doesn't have the external tabs that would have hidden the crappy bits.
And the cause of some of the dodgy electrics becomes clear. When the garage replaced the rear crossmember back in 2005 then cut the loom which is understandable, but then used crimp connectors to join it back together and hidden it all under a load of insulation tape rather than soldering everything nicely.
The last bit of loom. I lost track of the bizarre route it takes through the chassis rail, rear crossmember and both sides of the tub so there will be a lot of trial and error when it comes to refitting.
And with a helping hand, the rear tub is lifted away and we're left with a chassis that's not actually quite as bad as I was expecting.
The underside of the tub isn't too bad. The reinforcing pieces are causing a bit of corrosion so will need taking off and reattaching with some thin rubber to insulate it. The reason for the seatbelt bolts being so difficult to undo is now more obvious - despite looking immaculate on the top they've rusted into the brackets. I'll be either replacing the brackets or getting them sandblasted and galved.
The rock sliders had rusted into the jacking tube so I hadn't been able to get them off until the tub was out of the way. In the end the tube just twisted off leaving a pile of rust flakes, but at least it's easier to move around the chassis now. New sliders (galvanised this time) go on the list.
This is the state of the rear crossmember, which is probably the worst bit of the chassis other than the bulkhead outriggers and is pitiful given that it's the new newest bit. The metal is blowing where the layers meet and the rust flakes come off in sheets.
So that's it for the moment. The plan now is to borrow an engine crane and get the chassis out of the way in preparation for the new one which should be here in a fortnight or so
Hopefully I'll get a full day at it on Sunday. I need to turn the chassis around outside before I can get the engine out, which will be interesting without a steering wheel and would be even more interesting in the dark. Fingers crossed the rain stops by then.