So I've had a rear main shaft bearing failure on my 2004 Impreza TS with 5MT. I knew one of the main shaft bearings failed because the car sounded like a rally car in the first 4 gears, mind you not that loud, but gear whine was present.
I picked up a used tranny out of an older car to hold me over while I fix this one and keep it as a backup (Unknown mileage on used tranny, not the first car it was in either, was CHEAP)
Now, I've got my tranny torn apart, I need at MINIMUM a rear main shaft bearing 806225170. I've noticed the parts diagrams list one for turbo and one for non-turbo. The turbo one appears to be a dual tapered roller setup.
Can that setup fit in my cases? Is it an outer race that can retro-fit? Is it an upgrade? Also, the secondary shaft, how often do those massive bearings fail? Should I definitely replace those ones too? That shaft looks like a real pain in the rump roast to replace those bearings. I have 280k KM on this tranny, and want to replace both main shaft bearings, and any of the needle bearings the gears run on if they're looking bad. As well as the front diff bearings (They look well used).
Should I replace the centre diff bearings too? Or leave them if they're not making any noise?
And obviously will be replacing all the seals in the case while it's open.
Good news is, all the synchro's and gears look perfect, once the noise started, the car had only about another 100km on it and it was getting progressively worse over that time.
The bearing with my thumb on it is the one in question, it's cooked, wobbly, loud, crunchy, 3mm play lengthwise...