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Old 03-02-2009, 12:47 PM   #1
Scooby Newbie
Member#: 136884
Join Date: Jan 2007
Chapter/Region: RMIC
Location: Lakewood CO
2006 WRX

Default Possible rear differential going out?

Originally Posted by 22B05STI View Post
Has anyone heard of problems with the 05 Rear differentials in the Sti
it is notchy while creeping forward at slow speeds and I even thought I had been bumped from behind by another car as the diff seemed to have unloaded. It also is notchy with slight gear noise at very slow speed on a hard lock going up my driveway, it feels like the sidegears, you can baically feel the gears as they mesh but not much noise, I would like to know if this has been a problem with the LSD in these cars. it is never driven in the diff lock or driver control position so it is not due to being in diff lock which I know can't be done on firm surfaces anyway
Digging up this fairly old thread.
I have similiar issues. When at VERY slow, creeping speed I'm feeling a notching, or slight popping from the rear wheels. Happens a couple times every wheel rotation. Kind of feels like Im slowly rolling over gravel at the rear, but on glass smooth pavement. This happens regardless of going straight or turning.
Other symptoms include:
Sometimes when slowly coming to a stop, I feel a pop or shift. Then when I take off slowly, I feel it settle back, then notch a few times.
At speed the feeling turns into a slight shuddering from the rear. A loosness or un stable feeling.
A slight whinning at speed sometimes, barley noticeable though.
I've been told by a local, trustworthy shop that it may be the rear diff starting to go. They did hear a slight, very slight noise from the rear diff. But they are not 100% sure.
I've heard: loose axel nut, rear diff, maybe bad pinion back there.
Its an 06 WRX TR. Stock R160 viscous LSD in the rear. 60800 miles. The car has been tracked a few times. 300whp and 340tq.
This notchiness was very noticeable while on a dyno. We thought it could be a bent rim, or bad tires. It was neither and the dyno day was a while ago before the symptons became noticeable while everyday driving.

Thanks for any info.
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