Diff (s) or transfer case slack ?

[zeplacas Lurker Find all posts View Profile Close zeplacas]

Hi, i'm Jose Carmo from Portugal,
I recently bought a 2001 kzj90, real cool, to make my BJ40 company
I have a problem in my 90, he has a slack in one of this itens: transfer case or front diff or rear diff !

The slack is most notable when changing from 1ºst to 2ºd gear, but if i lock the center diff the slack desapears !
i suppose its from one of the diffs, because when the center diff is locked the 90 starts running with the most "unslacked" diff, so the slack isn't notable ! (am i right ?)

What do you suggest to determine the location of the slack



José Carmo
(http://www.tlcbj40.com check out my restoration)

sorry for my english !

[croozza Avid PP Poster! Find all posts View Profile Close croozza]

The slack your talking about is backlash in the diff (most likely on the rear), this is normal to have some, but if it becomes excessive you need to get the backlash adjusted, this will require the diff centres to be removed and the carrier bearings to be replaced and the locking rings tensioned correctly, worst case senario is for the pinion bearing and crush tube needing replacing too, but I would just do the lot anyway because the diff is already out.
The reason it dissapears when you lock the centre diff, is because your getting axle wind up on hard surfaces (not good). or if you did the same thing on loose surfaces, you dont notice the backlash.

[zeplacas Lurker Find all posts View Profile Close zeplacas]

Hi,
Many thks, i was going to do the test by removing the rear prop-shaft.
sorry for my English, but i didn't understood the part about getting the axle wind up ?

Jose Carmo