Outer Limits 4x4 Board

Looks like I've got some water into my gearbox . Most of the oil was fine then turned to custard at the bottom when I went to change it.

Any brilliant fixes on getting all the $#!T out of it? Ripco/Supercheap have no specific gearbox flush like you can get for engines.
I was thinking pouring kero in through the top (where the gear sticks go) but I'm concerned it won't all come out. Will a little bit of kero left in there cause any dramas?

Another thought was just flushing with cheap engine oil, run for a couple of seconds then drain it. Unfortunately there's no cheap gearbox oil.

A mechanic told me to just leave it draining overnight then in with the new oil.

What do you guys reckon?

Any G/Box oil is cheaper than a rebuild. Water can hang arround in drivelines, I would change the oil, drive it a short distance and change it again. What is your G/Lever boot like ?, where is the water getting in.
J Top

Water issue is all sorted. Just need to stop it happening again now.
Not sure where it's getting in yet. Must be through the gear boot or breather.