Does anyone know what fluid is recomended in an R200 diff? Do I need a special friction modifier.

 

You will need a 5 oz (I think thats the size) bottle of friction modifier or LSD additive (whatever its called). I believe the R200 has a viscous type LSD and its needed for it. When I changed mine, I just used what gear oil the shop had and a bottle of the modifier they had and it seems to be working well. I dont know what brands they were though.

 

Perfect, I have a bottle of GM LSD at home already

 

Depends.

An R200 diff is just the housing. Just like saying an AP1 diff. It says nothing about what kind of differential is actually inside the housing.

Just like an OEM AP1 pumpkin has a Torsen, but can have anything put into it (like a clutch-type OS Giken).

A stock R200 diff comes with a viscous LSD which is NOT a clutch-type diff.

Most would consider that a "downgrade" from a Torsen from a performance standpoint.

If you want a "good" diff put into that pumpkin, you have to have that installed. Obviously if you want a 1.5-way vs. a 2-way clutch type you have to order and specify that.

InlinePro doesn't usually supply the R200 diff. If you buy one from a junkyard, it'll have the viscous diff. That obviously doesn't need friction modifier.

 

^^The R200 diffs that are used in the S2k diff conversion are all the stock 1990-96 300zx non turbo diffs. So I believe they all have the same internals with 4.08 gears and viscous type LSD's. I meant to put viscous type and I fixed that.

We put the friction modifier in mine and the shop said I needed it.

 

I have a clutch-type diff installed in my R200. There's no way I would run a viscous diff in a racing application. I don't know about friction modifiers in viscous diffs. I know they're sometimes used in clutch diffs.

 

I dont think there is any problem with using a viscous LSD in this car as long as it has low miles and is working properly. IP uses the same diff and viscous LSD on their 933 whp drag car with no problems if I'm not mistaken. I purchased my R200 with only 20,000 miles on it and the viscous LSD's typically last around 60,000 miles before they start having problems. Once I have problems with mine, I'll put a Quaiffe in there.

 

I did some research and the fluid for the clutches is housed in the diff and the remaining gears and bearings use only standard 80-90W.

If I was road racing I would keep the stock rearend upgrade the spool and call it good. For me the R200 Diff was a solid choise for the money I paid.

 

No problem if your purpose is driving in a straight line. But then the "differential" part of the application doesn't matter very much.

The InlinePro/Driveshaft Shop diff kit hubs don't hold up to anything but straight line use anyway. We tried using them for track and autocross and destroyed six hubs before they would admit it was a design flaw. They finally took back the axles and put Evo-kit end CVs and different hubs on.