Buy the 10.309.181WK, the 180WK is wrong and you'll have a world of pain like I did. I had to buy another crownwheel and mainshaft and do a full rebuild, which I think is starting to play up...
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Welcome to the new look VWWatercooled
After much work and little sleep there is a new version of the forums running on more powerful and recent hardware as well as an upgraded software platform.
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Things are mostly the same, but some things are a little different. We will be learning together, so please post questions (and answers if you've worked things out) in the help thread.

The new forum software is an upgraded version of what came before, it's mostly the same but also a little different. Hopefully easier to use and more stable than before.
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Diffs - Quaife, Wavetrac, MFactory
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Been a while since updates, but the Wavetrac is in. I can't remember what I posted earlier on in this post, so to catch up...
I bought a second hand HWY gearbox off of Gav (from squib, such an honour)
Had it all cleaned and freshened up, rebuilt with new bearings, nothing major as it was in reasonable condition. Had to replace a couple of synchros but was the worst of it.
Wavetrac installed of course, went straight in with no issues.
Had a pinion shaft brace in the parts pile so popped that on while the box was out.
Finally, chucked in a new SACHS clutch and 7kg flywheel, the reason for starting all this (after 200k+ on the stock clutch, 150k of which on a stage 2 tune, it was proper fingered)
As you can imagine it was a fairly decent dent in the wallet, but...
DAMNNNNN is it good. I didn't really know what to expect, I've never driven a FWD with an LSD. What a difference it makes. More tractable in a straight line, holds lines easier and punches hard out of the turns. It has transformed the car when giving it a bit.
Worth. every. penny.08 9n3 Polo GTI
Mods: heaps
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Good stuff. Glad you finally got it in. Yeah I think as a streetable/daily-able diff its very hard to beat the torsen type diffs. I'm driving a 1 -way SQS clutch diff which is another level up again in terms of being able to just bury the throttle way before you could even with the wavetrac and just have it drag the car out of the corner. BUT its a bit of a punish when you are 3 point turning, carparking and pulling out of driveways whereas the wavetrac is like its not even there in those situations. I'm very very close to having the next box go in which has a 1.5 way KAAZ plate diff in it, so its going to be interesting to see how it compares to the current SQS in terms of streetablility/commuting, but I know its going to be an animal on the track. The wavetrac was a great diff.
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