Do you have the 100K warranty ?
There may be a pinion shaft for the front diff, but normally the pinion is in the read diff, ring and pinion.
I posted a photo of mine in the long term, how are they holding up thread in the sticky at the top of this forum last week.
check post 3286
174,000+ miles, 5/20/12 new ej257 short block, 8/20/11 installed VF52 turbo, @20.8psi, 280whp, 300ftlbs. Also CHECK YOUR OIL, these cars use it.