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6 speed swapping an s8, any advice/warnings?

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Old Sep 18, 2015 | 01:41 PM
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Default 6 speed swapping an s8, any advice/warnings?

Instead of waiting for the auto to fail, I just decided to put a 6 speed in her. I'm doing an 01e from a b5 s4. Already bought the tranny and diff. Already have the shift linkage. Still need a prop shaft, anyone know if there is a factory one that will bolt up? I plan on ordering manual s8 tranny mounts from Europe, pedal assembly from an a6, still need to figure out front cv shafts also.


So I just figured I'd make a thread and see if anyone knows anything in particular I should watch out for. This is being done at a high end performance shop with access to any machining required for custom fabrication, but I don't think there will be much of that from reading other 6 speed swap threads.

Also am putting in a lower ratio 6th gear as was advised in other threads.

Any advice is appreciated!

Also, what's the value of a manual s8 in the US? I saw one on here listed for $15k. Is that a realistic value?


Thanks!
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Old Sep 18, 2015 | 05:54 PM
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Default You can keep the S8 rear diff.

Get a drive shaft from an A8L. They are 4.5" longer.
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Old Sep 21, 2015 | 07:16 AM
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Mine has been for sale here for some time here with no takers. It is such a fab car I thought it would be worth a lot more. You will know the street value of a top notch conversion tonight at 8 pm when the bidding ends: Audi S8 6 Speed Manual Transmission | eBay
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Old Sep 21, 2015 | 08:01 AM
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In for later, when I finally do a 6-speed swap.

But yeah, if you have an S8, you've got the right final drive ratio to match the B5 S4 transmission.
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Old Sep 21, 2015 | 08:40 AM
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I'm collecting parts to do mine as well. You will need UrS4/6 front halfshafts plus a spacer for one side.

Driveshaft - New D2 S8/A8 6 speed (6mt) Cardan/Driveshaft, Advanced Automotion

You will need the Euro front subframe, not trans mounts unless I'm mistaken. Rear diff can stay like noted above.

I'd also get a better clutch than a stock B5S4. - this is a pretty good deal.
https://jhmotorsports.com/shop/catal...27t-p-822.html
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Old Sep 21, 2015 | 11:24 AM
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Thanks guys.

Isn't a stock s4 clutch good for 400HP? I don't really plan on modding the motor, and I typically don't beat on my cars...
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Old Sep 21, 2015 | 11:25 AM
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And the rear diff came with the tranny, so I guess I'll just sell it.
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Old Sep 21, 2015 | 12:52 PM
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Stock S4s made 250hp, and they have a dual mass flywheel that is heavy and prone to failure. RS4s made 380hp? I think. You can use a B5 RS4 clutch ($450), but those are not as robust as a B7 RS4 clutch. Plus, Rock Auto sells B7 RS4 clutches for $137. Those require JHM to machine an aftermarket B5 flywheel for $250, which is what the whole kit is that I listed.

I have a good B5 S4 clutch/flywheel I'd sell for cheap as I have no use for it. It came with my B5 S4 driveline pallet of parts if you don't have one.

Last edited by JAA 4.2; Sep 21, 2015 at 12:56 PM.
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Old Sep 23, 2015 | 05:43 AM
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Originally Posted by JAA 4.2
I have a good B5 S4 clutch/flywheel I'd sell for cheap as I have no use for it. It came with my B5 S4 driveline pallet of parts if you don't have one.
How cheap are we talking, and where are you located? I am using a B5 O1E with the 2.7t spacer, so I would need the flywheel shim with this setup, yes? Thanks in advance.

~Sam
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Old Sep 25, 2015 | 08:46 PM
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Hi Sam,

I don't know if you need the spacer.

Guy that sold me the trans said the clutch had 10,000 miles on it. Car was stock. It overheated and he parted it out. $100 + shipping for the flywheel, clutch, pressure plate? I'm in Detroit metro.

John
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