HELP!!!!!!Rear Differential Oil

[Tdola]

Does anyone know what weight rear differential oil to use on my 2006 300 SRT-8 for my Quaife and DSS Axle install. I have 75-90 Royal Purple but I just read somewhere that this stock rear takes 75-140 weight. I purchased it from a vendor here that said to use 75-90 so that's what I bought. Maybe the use of the Quaife requires a different weight (75-90) compared to the stock open diff weight of 75-140. I'm so confused!!!!!!!!!!!!!!!!

[RobAGD]

Check the Quaife site for what they want used. Once the factory diff is out it is up to the center section manufacture on the oil spec.

-R

[RobAGD]

What sort of gear lube should I use ?
For QUAIFE ATB Differentials:
When running a QUAIFE ATB Differential in a standard transaxle gearbox, we recommend that you use whatever your vehicle's manufacturer recommends. The QUAIFE ATB Differential does not require any special lubricants.

When running QUAIFE gearbox internals and a QUAIFE ATB differential – we recommend Silkolene SYN5 75W90.

For a QUAIFE ATB differential, running in a rear axle – use a hypoid 90 or 75W90, as above.

For those applications that will accept a GL5 or SAE75W90 gear oil, we recommend and sell Silkolene SYN5 75W90 gear oil. We use Silkolene in all our own QUAIFE racing transmissions.

[Tdola]

Great Info Rob. I just e-mailed Quaife as well. Thanks for your help.