R200 Longnose Viscous Lsd Options

[RLY240]

I’m looking for a 3.9 longnose R200 diff and I’ve been offered a viscous LSD which I’ve not come across before.

It looks like the rear cover is the main difference as it’s much larger presumably for greater oil capacity but the cover would need to be changed to a Z item in order to fit into an S30.

But is this reduced oil capacity going to be an issue?

Anyone tried this and can offer advice?

Also, not sure if the side shafts are the same, again anyone got any info or advice?

Roger

[600Z]

Hi Roger,

 

I have been doing a bit of reading in regards to this as well as I have a couple of 4:11 diffs I want to confer to LSD's too.

 

From what I understand is that the viscous diffs use a longer input shaft to pick up the viscous drive so this would mean you would have to sort out CV's and adapters to suit the new flanges on the input shafts.

 

Apparently if you get the mechanical LSD out of the short nose r200 diffs they bolt straight in but depending on the diffs the crown wheel bolts vary between 10mm and 12mm so you would have to check yours on the longnose first otherwise the bolts won't go through into the new hemisphere.

 

There is a fair amount of info on this conversion on the net but I'm sure there would be someone on here who has done it who can point us both in the right direction.

 

Cheers,

Justin

[RLY240]

Thanks Justin, I also understand that the viscous units have different shafts which might scupper the idea for me before it starts.

[600Z]

Hi Roger,

 

Yes and no, there is actually a good article on using pathfinder axles and CV's so there is a combination there if you have a set of four bolt Z31 shafts but then you need the companion flanges to suit at your axle end from whitehead performance.

[nat0_240_chevZ]

I have put a mech 2way cusco diff in an open r200. Had 13mm bolts, yes m13, no bs.

From an r33 Gtr. (a very unusual size)

Viscous can /will work if you desire.

My suggestion is stick with mechanical.

Finding a precision diff professional, is very hard, have had some run ins with so called pros, whom i collected my diff in pieces, and performed mods my self, then got local engineering shop to check the mesh/alignment and lash. Otherwise all your hard work and cash ends in the bin.

Be prepared to pay money for the work, it's pretty delicate stuff, very fine tolerance, which a good machinist or engineer can only appreciate.

My need for a 2way, was behind an auto v8.

Still ran orig uni-joint outputs, but shafts had subtle mods to suit. Later swapped to cvs, (no reason other than want, ie no breaks) these also reqd, the same subtle mods to the output shafts.

Nat0