'04 WRX Transmission AND Differential Servicing

[LaszloT]

I've got a bit of road noise at 100kph after a wheel bearing was replaced even with my new performance tires. Caveman put an auto stethoscope on the bearings and it wasn't that, so we decided to schedule a transmission and differential servicing.

So I dug out the maintenance documentation for my Rex from the previous owner, and the following work that was done at Mr. Lube :

-----------------------------------
155,000 km
Front Differential SVC $70
Mobilube 80W90 LS GL5 60L
plus
R.R. Gear-Rite Syn Treat. $12

170,547 km
Rear Diff Synthetic SVC $100
Pennzoil SYN GLS 75W90
plus
R.R. Gear-Rite Syn Treat. $12

184,948 km
Transaxle/Final Drive PKG $100

200,170 km
Differential LS Additive $20
Differential LS Additive $20
-------------------------------------

Although it's fair to assume that Mr. Lube has reasonably competent folks working for them, I'm not sure that all this work was required and I doubt that I'd have them do it even if it was.

However, since I'm on the verge of getting Caveman to do a tranny and differential servicing, does this maintenance history change the priority of the work we are about to undertake?

[Robin]

With my old RS, i like changing the fluid every couple years max or about 20k kms or so (as you see i don't drive much).

I should change my fluids in my 11wrx now.... about 25k kms... and change the transmission and rear diff.

pretty simple job overall on the 5spd and rear diffs.

old car, i had the the "mix" / joe told me about it. part redline (1quart and rest amsoil). and rear used amsoil.