Local oil change place says that the front and rear differentials and transfer case need fluid changed. So, how would the local oil change place know if the differentials were due to have the fluid changed?
The first system, called ACT-4 (Active Torque Split) by Subaru, was the same setup commonly found on other Subaru models of the period, and used a variable clutch pack center differential using a 90% / 10% power split front to rear, which could transfer up to a 50% / 50% power split for maximum traction if the front wheels started to slip ...
The 5spd gearbox does not use separate fluids for the front diff and the gearbox itself. On these one only changes the fluid for the gearbox (use a 75W-90 GL5). The rear diff has the same fluid specification requirements. If your car is automatic check the manual for what to do, sorry.
Change the Rear Differential Fluid on a 2nd Generation (2000-2008) Subaru WRX STi. Works For: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Subaru WRX STi Models
Differential Repair and Installation Instructions. Please read completely before beginning! You can expect many years and many miles of dependable use from Axle bearing axle seal. Wheel stud. Open Differential Internals. Carrier bearing & race differential case / carrier.
GM Original Equipment™ SAE 75W-90 Synthetic API GL-5 Differential Fluid, 1 Quart by ACDelco®. Location: Front. Viscosity: SAE 75W-90. Oil Base: Synthetic. Oil Type: API GL-5. Volume: 1 Quart. Quantity: 1 Bottle. This product is made...
Mobil 1 makes a good GL-5 for the front diff. (Make sure not to use GL-5 in the rear transmission, however, as that takes only GL-4--eveybody wisely uses Redline GL-4 synthetic for the rear.) You can also use the Redline GL-5 or GL-4 for your front differential.
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This is a normal open type Diff. Subaru Impreza front differential Used but in fantastic condition. Fits a 1992 - 2000 2.0i AWD Impreza Saloon. 5 speed gearbox.