Audi transmission Swap DIY Thread
 

Hello 986forum! Here's the DIY oriented thread I posted in general discussion. Feel free to discuss the more technical aspect and specifications of the swap in this thread.


http://i.imgur.com/B6hLPvE.jpg?1
Find yourself a donor. I found an audi a4 5speed manual transmission. Quattro will not work. Some VW passats will work too. S model boxsters can utilize a 5 speed transmission - but require a lot of modification, e.g. axle flanges, mounting hardware. There are forum members with 3.4 996 engines and 97-99 5 speeds. The swap I performed is practically a direct bolt up for 97-04 2.5s & 2.7s. It can be done with S models, or 3.4 etc.

http://i.imgur.com/gC5MITl.jpg?1
Drain oil from old transmission, remove axle flanges- they are not compatible with 2.5/2.7 axles. But- interestingly audi flanges should be the same as S model chasis axles.

http://i.imgur.com/UgHNqvs.jpg?1
Remove Boxster transmission.


http://i.imgur.com/4S9pAu2.jpg?1
With boxster transmission removed, switch out axle flanges and swap all hardware between the transmissions.


http://i.imgur.com/EhZMbhYl.jpg
Putting the Porsche flange in the Audi transmission.


http://i.imgur.com/XRYZnUWl.jpg
Re-assemble

note: If you do not have M12x1.5x70mm (999-072-008-09) 'G' bolt location picture, it would be recommended to order and install
http://www.pelicanparts.com/techarticles/Boxster_Tech/37-TRANS-Drop/images_small/Pic4.jpg The boxster transmission has a stud in the case, whereas the audi does not. G bolt did not come with my car.

Total cost: $200
Results: Shorter, more aggressive gearing. First gear takes off like a bat from hell. Highway cruising in 5th is slightly more efficient compared to G86/01 5spd Boxster transmission.

Ratios:
Final Gear Drive 3.889
1st 3.778
2nd 2.176
3rd 1.429
4th 1.029
5th .838
(Similar ratios to G86/00 97-99 boxster, albeit shorter)

RPM Chart: (calculated with 255/40/17 tires)
http://i.imgur.com/YAaOMhc.png

nice mod !
now I want one ^^

So how does one determine which transmission can be swapped? I have an S and would be interested in a six speed swap.

That conversation, as well as some other relevant stuff, got rolling on this one:

http://986forum.com/forums/general-discussions/56662-audi-swap.html

Thanks, I think that will make it cleaner!