Cptsideways
Well-Known Member
Having removed a seized up viscous unit, my inquiring mind got the better of me & my alter ego Cptanglegrinder comes to fore 
It's a completely sealed unit, there are two ball bearings on one face that are obviously the fill points for the goo inside. It's a fairly solid lump, about 10kg's & has two neat seam welds all the way round its circumfrence.
Now not knowing what was in there & if it was under pressure I went in fully armed, googles, mask, gloves & carefully started & carefully with a slim grinding disc ground into the weld line on one side. The wall thickness is about 6mm.
Eventually worked out its a castlelated fitment for the end plate & prized it open...... no goo came oozing out...
Whats inside then??
Well hundreds (yes hundreds) of super slim lsd syle clutch pack type discs, layered up alternating between input & output. Between them is some black goo thats has the consistency of soft cheese. Its not runny at all. These clutch packs have frictions marks & obvious wear marks on them.
So if you have an 80 post 93 I think with one, DO NOT use odd sized tyres, as this will get fried for sure. There is nowhere for the heat build up to go as its so thickly walled. It's easy to remove with the back of the transfer case out & the car will drive quite normally without it. Its not a direct drive more an intermediate drive coupling.
It's a completely sealed unit, there are two ball bearings on one face that are obviously the fill points for the goo inside. It's a fairly solid lump, about 10kg's & has two neat seam welds all the way round its circumfrence.
Now not knowing what was in there & if it was under pressure I went in fully armed, googles, mask, gloves & carefully started & carefully with a slim grinding disc ground into the weld line on one side. The wall thickness is about 6mm.
Eventually worked out its a castlelated fitment for the end plate & prized it open...... no goo came oozing out...
Whats inside then??
Well hundreds (yes hundreds) of super slim lsd syle clutch pack type discs, layered up alternating between input & output. Between them is some black goo thats has the consistency of soft cheese. Its not runny at all. These clutch packs have frictions marks & obvious wear marks on them.
So if you have an 80 post 93 I think with one, DO NOT use odd sized tyres, as this will get fried for sure. There is nowhere for the heat build up to go as its so thickly walled. It's easy to remove with the back of the transfer case out & the car will drive quite normally without it. Its not a direct drive more an intermediate drive coupling.
As you say, I'm sure heat kills them in the end.
