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Hi. I'm new to scooby will need help ..
I got a wrx 2005 which engine wise it's great but the gear box it's crunching from 3 to 4 gear .but won't do when I do 4 to 3.
Now wat best way rebuild it or find a second one ?
If you want to go for the best, the Millers CRX 75w-90 NT, Gulf Competition, Motul Gear 300, Red Line 75w-90NS and Millers TRX are ideal for the gearbox. The Castrol Universal/Universal Plus, Motul Motylgear and Fuchs Gear Syn are all decent alternatives. The Fuchs Syn 5, Millers CRX, Redline 75w-90 GL5, Motul Gear 300 and Gulf Competition are ideal for the diff. The Fuchs Sintopoid, Castrol Syntrax Longlife, Millers TRX, Motul Motylgear, Mobil SHC and Amsoil FGR are also good choices.
my old bug had a 3-4 crunch as well at high RPM, changing the oil definitely helped it as did adding a bottle of molyslip. Was still a little sound from it when i sold it and it's still going strong.
If i was keeping the car then I would have opted to rebuild the box, a little more cost than a replacement box but at least you know everything is fresh and you wont be stripping it down in a few months if the 2nd hand box develops a fault.
Motul Gear 300, Castrol Universal and Red Line Lightweight shockproof (probably the best proven one to stop crunching, but not cheap) are probably the most popular options for sorting out the crunching. That's a 6 speed box isn't it? They take 4.1L and you can use those oils in the diff too and that takes 0.8L.
Wrx 2005 gearbox crunching
