Jimny veering wildly when in four wheel drive

:ohmy: :ohmy: :ohmy: :ohmy: :ohmy:

Then you are left with removing front and rear differentials and counting teeth to make certain that they are the same ratio I'm afraid. The ratios changed completely in 2005

I don't think the transfer box is at fault as you had no problem before the front axle was replaced.

Ok put it in 4wd and jack up one side of the truck make sure both wheels are off the ground all so make sure the wheels are chock the wheels on the ground and leave the hand brake off. Leave the gearbox in neutral.put a bit of duck tape on the arch in front of the rear wheel at hub level and put a bit of tape on the arch behind the front wheel at the same level to make sure you have the tape in the right places , get on your knees at the front of the truck and look down the side to make sure that you can see the centre of the wheels are in line with the tape.
Now put a bit of tape on each tyre closest to the tape on the truck.
Now put with a marker pen or chalk a level line on all bits of tape so they match up.
NOW SPIN THE BACK WHEEL THREE FULL TURNS CLOCKWISE.
If the front lines match up then it will be different sized tyres but if not different diffs.
If the front wheel lines are less rotated clockwise then you have auto diff on the front if they are more rotated on the front then you have an auto diff on the back. Hope this helps.

The sad thing is that the swivels on your original axle could probably have been brought back to scratch with a little elbow grease. Then you wouldn't have needed to change axles and be in this predicament!

Hope you get it sorted though. It does sound like you have different ratio diffs.

Kirkynut

After much frustration have now managed to acquire the correct diff for the rear (to match the front) but having trouble removing half shafts, any tips?

1. Slide Hammer if you have one.
2. Bolt on old drum or wheel and hit with large hammer

You have undone the 4 nuts each side at the axle flange?

Just in case:

1 carefully undo brake pipes and remove from wheel cylinders. (You can simply remove all the pipe retainers and let the pipes straighten out, but this is not recommended)
2 remove brake drums
3 undo and remove the 4 nuts on the inside of the axle flange each end.
4 snatch halfshafts out with a slide hammer as Martin said. Or try putting the wheel on and tightening up the nuts to leave a 10mm gap then keep snatching the wheel in and out.
5 remove differential.
6 notice a large pool of oil coming from whichever end of the axle is lowest, despite drainging the diff first. :pinch: