Audi a8 99 tranny limp mode.

[Tony Hoffman]

<snip>
I'd also be willing to bet that the manual transmission swap is at least 30
hours labor. Just R&R'ing the transmission accounts for more than half
that. Swapping the console, running shift cables, installing the third
pedal, and 200 unforeseen tiny problems easily take up the rest.
<snip>

This is exactly what I was thinking. In fact, I'm thinking an older Audi
auto to manual swap is 30+ hrs for your average DIYer, much less an A8. I'd
plan on at least 40 my first time in, and I do this sort of stuff regularly.

Anyhow, just all depends on how badly you want a manual in the car. Also,
if you car is a 32 valve, you have to find a 32 valve flywheel (Audi V8
Quattro, S6 plus) as it has 10 bolts, not the 8 as on nearly every other
Audi engine.

Tony