Can it be done? Oh yea, mine is a 2001 TQM. My buddy works at a salvage shop and they have a trans mission just sittin there that they say I can have cheap.

 

I've never seen or compared them but I would say why not it should work its the same houseing on the 3.0 with the 6spd which is the same houseing on the 5spd if memory serves me from doing some shoping around awhile ago. But heres the other thing is it worth it? Thats alot of work for just the tiny extra bump or is that all your after a monster to build.

 

it certainly can be done, and has been done lots of times.

 

 

most ppl just swap in a 2.8 tranny since the gears are taller (iirc about a 400rpm difference at 80mph in 5th) ... the s4 tranny doesn't have much taller gears than the 1.8t, it just has a 6th gear (that was a rather large generalization i know, but umm yea)