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#1: 01-27-2013, 09:51 AM
Viscous Centre Diff To Open Centre Diff
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I have bad torque bind on my 2005 GT Legacy 5 speed manual.

Replacement viscous couplings are so expensive not to mention the labour on top to fit it.

As I have just spent loads on an engine rebuild, replacement gearbox, new clutch and new flywheel etc. I feel rather aggrieved at the thought of having to spend a load more cash on a new centre viscous coupling (part number 38913AA102).

If the diff had completely failed (broken / stripped teeth) I guess I wouldn't feel quite so bad but the fact is that the differential is essentially fine; it's 'just' the viscous coupling that is binding. Hence I feel aggrieved at the thought of having to buy a completely new centre differential and viscous coupling assembly.

If the viscous couplings failed to an 'open' differential rather than failing to a 'locked' differential then probably 99% of owners would never realise anything had gone wrong!

  • Not all Legacy's have a viscous centre coupling; i.e. lower powered non-turbo versions have 'open' centre differentials I beleive. Do these cars have an equivalent centre differential but without the viscous coupling part? If so could one of these 'open' differentials be swapped for a viscous centre differential?
I still have my 'old' gearbox which has the same viscous coupling in as the one which is binding in my recently replaced gearbox. My old gearbox has done 100k miles and my recently replaced gearbox has done about 50k miles.

  • Is it possible to take these viscous couplings apart and drain the silicone fluid and put back together to effectively have an 'open' differential? I know there are some downsides such as less traction but it still going to be better than a 2 wheel drive car and 99% of the time I probably wouldn't even notice the difference?
If this is possible I could save myself a lot of money!

Any thoughts welcome!


Last edited by Telephonewire; 01-27-2013 at 09:55 AM..
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