Engine/tranny swap from 2003 A6 2.7T into 2004 A6 3.0

[vtraudt]

Can i swap engine and transmission (auto) from
2003 A6 Quattro 2.7T
into
2004 A6 Quattro 3.0

Do I also need to swap the rear end (if 3.0 tranny has different gearing than 2.7T tranny)?

Alternative:
swap
2003 A6 Quattro 2.7T auto
into
2001 Allroad auto
(I know rear diff needs to be swapped also, but possible aside from that? Drive shafts (front, center, rear)?

[Scotty@Advanced]

Can i swap engine and transmission (auto) from
2003 A6 Quattro 2.7T
into
2004 A6 Quattro 3.0

Do I also need to swap the rear end (if 3.0 tranny has different gearing than 2.7T tranny)?

Alternative:
swap
2003 A6 Quattro 2.7T auto
into
2001 Allroad auto
(I know rear diff needs to be swapped also, but possible aside from that? Drive shafts (front, center, rear)?

If the AR has the air suspension then you need to use the AR front axles. Also the A6 propshaft has to be shimmed to be used in the AR.

[vtraudt]

If the AR has the air suspension then you need to use the AR front axles. Also the A6 propshaft has to be shimmed to be used in the AR.

Decided to use the 2.7T drivetrain from the 2003 A6 in the 2004 A6 3.0. Can I swap engine and tranny into the 2004 3.0? Are trannies identical? Do I need to softcode/change the TCU?

Or is everything 'bolt on' and 'plug and play' (from 2003 2.7T to 2004 3.0).


Correction: the 3.0 A6 is a 2002 (just looked up the VIN)
This is the 2002 3.0 TCU scan:

Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 4B0 927 156 FF
Component: AG5 01V 3.0l5V USA 1213
Coding: 0001002
Shop #: WSC 03419 444 53463
VCID: 70EF6851602FBB9E643-5106

No fault code found.

This is the 2003 A6 2.7T scan:

Address 02: Auto Trans Labels: 01V-927-156.lbl
Part No: 4B0 927 156 FE
Component: AG5 01V 2.7l5VT USA 2222
Coding: 01002
Shop #: WSC 02325
VCID: 6FED6B2D2D11A460C91