Center diff. shimmng
Posted: Sat Dec 03, 2016 4:07 am
Team,
My center diff started seriously whining on deceleration on my '04 Outback. (I assume the set up and shim measurement procedure will be the same or similar between an '04 Outback 5MT and a First Gen. with 5MT) I found the service bulletin that discusses updating the tailshaft extension case (center diff end cover) on the '99 up Legacy, Outback, Forrester. and that bulletin provides the specific information and all details for the measurement process and equations for choosing appropriate shim sizes in the center diff case. BUT, I am not convinced that I want to drop $220 on this extension case Part #: 32130AA360 and (9) case bolts of a shorter length. This updated case adopted a dish plate to compensate for the shrinking of the center diff case in colder temps that allowed for too much tension on the tapered roller bearings on the driven gear shaft inside the center diff. and thus caused premature bearing failure and un-necessisary whine from the gears, leading to chipped or even completely broken teeth on the center diff drive and driven gears. In my situation, I only have a few chipped teeth on the driven gear. I will be trying to reuse it and see how it sounds.
I am just unsure if it's really worth it to actually go as far as updating the extension housing. Or just slap it back together with the old cover and get probably another 100k out of it before having to replace the bearings again. I feel like, I'd like to slap it back together. But, since I replaced the bearings and will be replacing the center diff, as well, (becuase mine fell apart and the bearing on the center diff was toast), I feel like I should be taking measurements due to replacing the center diff. and all (4) bearings. So to recap:
1) Is it worth it to update the center diff extension housing part # 32130AA360 ??
2) If it's not worth it to update to the newer extension housing, Does anyone know the measurement proccess for selecting shim sizes inside the center diff on '99 up Legacy, Forrester, Outback? Or do I have to join another forum ? Lol .....Thanks everyone ! !
P.S. Does anyone know the differences between the drive and driven gears in the center diff between the '02 WRX and my '04 Outback ? The extension housing, center diff, and the complete transfer casing is all the same between the '02 WRX and the '04 Outback. The reason I ask,is becuase I can get the drive and driven gears from an '02 WRX for a very good price. I'm wondering if they will fit. But I am not seeing a reason wy they would not fit, sincce the center diff and both the transfer case housing and extension housing are all the same.
My center diff started seriously whining on deceleration on my '04 Outback. (I assume the set up and shim measurement procedure will be the same or similar between an '04 Outback 5MT and a First Gen. with 5MT) I found the service bulletin that discusses updating the tailshaft extension case (center diff end cover) on the '99 up Legacy, Outback, Forrester. and that bulletin provides the specific information and all details for the measurement process and equations for choosing appropriate shim sizes in the center diff case. BUT, I am not convinced that I want to drop $220 on this extension case Part #: 32130AA360 and (9) case bolts of a shorter length. This updated case adopted a dish plate to compensate for the shrinking of the center diff case in colder temps that allowed for too much tension on the tapered roller bearings on the driven gear shaft inside the center diff. and thus caused premature bearing failure and un-necessisary whine from the gears, leading to chipped or even completely broken teeth on the center diff drive and driven gears. In my situation, I only have a few chipped teeth on the driven gear. I will be trying to reuse it and see how it sounds.
I am just unsure if it's really worth it to actually go as far as updating the extension housing. Or just slap it back together with the old cover and get probably another 100k out of it before having to replace the bearings again. I feel like, I'd like to slap it back together. But, since I replaced the bearings and will be replacing the center diff, as well, (becuase mine fell apart and the bearing on the center diff was toast), I feel like I should be taking measurements due to replacing the center diff. and all (4) bearings. So to recap:
1) Is it worth it to update the center diff extension housing part # 32130AA360 ??
2) If it's not worth it to update to the newer extension housing, Does anyone know the measurement proccess for selecting shim sizes inside the center diff on '99 up Legacy, Forrester, Outback? Or do I have to join another forum ? Lol .....Thanks everyone ! !
P.S. Does anyone know the differences between the drive and driven gears in the center diff between the '02 WRX and my '04 Outback ? The extension housing, center diff, and the complete transfer casing is all the same between the '02 WRX and the '04 Outback. The reason I ask,is becuase I can get the drive and driven gears from an '02 WRX for a very good price. I'm wondering if they will fit. But I am not seeing a reason wy they would not fit, sincce the center diff and both the transfer case housing and extension housing are all the same.