it seems to happen if i get wheels skiping under load on rocks or reversing out of steep driveways in the wet (i have a part time conversion)
i have 1st 3rd and 5th no 2nd and top
i have thought it could be a worn selector
after a little while it can be reefed into second and it drives normal untill the wheels skip badly again (it also happens if i use compression braking in 2wd down slippery slopes) any ideas
the box was rebuilt20 000klms ago

"part time" as in rear wheel drive only?

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yep untill ilock the hubs and select 4wd (what used to be cdl)