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Old 07-03-2020, 11:38 PM   #1
ScubaruImpreza05
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Member#: 74041
Join Date: Nov 2004
Chapter/Region: Tri-State
Location: Suburbia PA
Vehicle:
2006 2012 Weee-strom
14 Hyundai Borenata

Default What if center differential fails?

I am going to be driving 250 miles to a rallycross event. My center differential is burned, and the bearings are getting noisy and sloppy. I've done several events on them so far, but this is the first one further away.

In the event of a center diff failure, can I just disconnect and remove the rear driveshaft to limp it home? It is a manual 5 speed, 06 Impreza non turbo.
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Old 07-04-2020, 11:13 PM   #2
JarHarms
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2006 WRX, 6MT, 5x114

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Quote:
Originally Posted by ScubaruImpreza05 View Post
I am going to be driving 250 miles to a rallycross event. My center differential is burned, and the bearings are getting noisy and sloppy. I've done several events on them so far, but this is the first one further away.

In the event of a center diff failure, can I just disconnect and remove the rear driveshaft to limp it home? It is a manual 5 speed, 06 Impreza non turbo.
If you were to remove your prop shaft the majority of your 5MT gear oil will exit the extension housing and onto the road. So no one is going to recommend you do that.
But more importantly, I would NOT drive let alone rallycross without repairing it first. I mean why not fail the cir-clip and send it through the transfer gears to chunk most of the teeth off? All you are doing is ensuring yourself a full 5MT rebuild. Fixing it now might just be a Cdiff, transfer bearings, maybe transfer gears, and all work in the transfer and extension cases.
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Old 07-04-2020, 11:37 PM   #3
ScubaruImpreza05
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14 Hyundai Borenata

Default

Kind of figured. Bleh. Since the center diff is definitely burned (sticks/clicks when turned and backing up) it's more cost effective to just get a good used trans and swap it in for now. New center diff goes for 550 shipped. I can get a good used trans with a warranty from a local subaru yard for 450. Then I could eventually replace the current one with a new diff and bearings.
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Old 07-04-2020, 11:45 PM   #4
JarHarms
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Yea probably a good plan to take.
You won't know what all needs replacing until you open up that 5MT and have a look. Plan on at least a Cdiff, all transfer bearings, ext housing roller bearing, tube of ultra gray, gear oil, FSM specs, maybe a few shims, etc. Hopefully the gears on the transfer shafts are good so you can reuse those. Also a good time to replace the shift selector seal and rear seal (if those are leaky). Best of luck.
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Old 07-05-2020, 08:59 AM   #5
ScubaruImpreza05
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14 Hyundai Borenata

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Originally Posted by JarHarms View Post
Yea probably a good plan to take.
You won't know what all needs replacing until you open up that 5MT and have a look. Plan on at least a Cdiff, all transfer bearings, ext housing roller bearing, tube of ultra gray, gear oil, FSM specs, maybe a few shims, etc. Hopefully the gears on the transfer shafts are good so you can reuse those. Also a good time to replace the shift selector seal and rear seal (if those are leaky). Best of luck.
Thanks. The new/used trans will come with a center diff as well so I'll just pop it in and then look to rebuild the damaged one. It sucks center diff are so expensive, aftermarket performance ones fetch 1200, and dccd are 2k plus just for oem Sti ones. I guess they are a centerpiece though. Feels silly to spend that much on my weekend rallycross beater, but might not be a bad idea since I'm not a soft driver on the course.
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