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I replaced both the diffs in my Jimny in an afternoon. It's not a big job, and you certainly don't need to replace the whole axle. Fitting a locker is a bit more involved as it requires dismantling the diff and then re-assembling and setting the backlash. I imagine this is the bit they would outsource. But in terms of fixing your noise issue by replacing with another standard differential it is a simple job for any mediocre mechanic.
Personally I would stay well away from a Detroit Locker - ok they are cheap ...
I've had them for years, but even though they are "meant" to unlock - they don't.
Don't get me wrong they are awesome if ll you are going to do is Pay n Play, but if like me you Green Lane and have to drive tarmac there and back, the Locker will:
1) Wear your tyres out quicker
2) Chew the ends off you rear shafts
3) After 3-4years they bugger up your Diff
Spend wisely - work out how much your Locker is, add to that rear tyres every 18months, maybe a set of rear shafts every year, add new bearings, add new ABS Collars, and finally the cost oif another Diff ...
ARBs (air controlled) Lockers workout around £1,200 fitted.
Kaisers are around £600 - I got mine fitted for £25 at local garage - I have a Kaiser in the Rear and Front Diff
Thanks for the replies, decided an axle swap will do me, keep the costs down. I think I will only have Little Jim for another year or 2 then get something else, and I haven't needed a locking diff in the last 3 years of ownership.
Idea for a test. Find a country lane with a decent enough grass verge at about the same height as the road. Wait until it has rained. Park n/side wheels onto grass with o/side on road. Carry out full blooded start and see what happens.In Landcruiser left grooves in grass and motor hardly moved forward.
Go home and fit Eaton-Detroit Truetrac L.S.Diff in rear ( they can be fitted in front as well ).
Carry out test. Result, no wheel spin on n/side, just full blooded acceleration with slight chirp from o/side rear tyre (tests carried out in 2 wheel drive). On checking the grass on the verge no sign of damage.
Other things to note
1/ Cornering improved because the diff is controlling the attempt by the inside wheel to slip.
2/ Oil specified is basic hypoid. Do not use synthetic. It's fit and forget and long lasting.
3/ It doesn't act in any unpleasant ways.
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