1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Gearbox Compatability

Discussion in 'A4/S4 forum(B5 Chassis)' started by Broken Byzan, Feb 17, 2008.

  1. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    Ok so i need to swap out my gearbox as 2nd is getting bad and i need to do the clutch anyway as the turbo/remap is causing it to slip.

    Oh i am 2wd BTW

    My question is, will a diesel box fit on the 1.8t? I know a V6 one will as i need to get a stronger box preferably with higher ratios for cruising etc.

    I also aim to swap the shafts too

    A 6 speed would be lovely but.............OUCH How much !!!!!
    #1
  2. Markey
    Offline

    Markey Active Member

    Joined:
    Apr 13, 2004
    Messages:
    2,148
    Likes Received:
    0
    This was covered a few weeks back, the 2.5 Diesel 6 speed will fit and they are about 400 quid from what i have seen, when i do my clutch im going to replace it.
    #2
  3. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    I did search and read quite a lot of posts but couldnt find anything useful, hmm how did i miss that?
    #3
  4. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    Found it !!! Was back in December !!!!!
    #4
  5. Siena
    Offline

    Siena Active Member

    Joined:
    Oct 28, 2007
    Messages:
    2,626
    Likes Received:
    3
    Diesel box will fit, 5 or 6 speed.

    May be a tad over-geared for a petrol engine though, especially a turbocharged one.
    #5
  6. Markey
    Offline

    Markey Active Member

    Joined:
    Apr 13, 2004
    Messages:
    2,148
    Likes Received:
    0
    What do you mean by over geared ?
    #6
  7. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    My take on it is this, a Diesel car revs less so need to make top speed @ like 5k revs and petrol cars make top speed @ 6.6k. So in theory it is possible to use the box but i think it would be a true overdrive solution. On a cruise i recon the engine would be barley ticking over rather than the annoying 3.5k i have now @ 70
    #7
  8. Markey
    Offline

    Markey Active Member

    Joined:
    Apr 13, 2004
    Messages:
    2,148
    Likes Received:
    0
    So its good really then and better to be used on a mapped car with a bit more torque ?
    #8
  9. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    HMM not sure whether we will have enough torque to make the difference. I guess its a trial and error thing as i am sure i can afford to have the revs at least 1 k less at 70 as the k04 makes max boost @ around 2.2k ish iirc
    #9
  10. macca
    Offline

    macca Member

    Joined:
    Sep 6, 2006
    Messages:
    525
    Likes Received:
    0
    i watch with interest as i have been toying with the idea, my gearbox is starting to make noises. would love 6 speed box.
    #10
  11. Markey
    Offline

    Markey Active Member

    Joined:
    Apr 13, 2004
    Messages:
    2,148
    Likes Received:
    0
    As soon as my clutch is up i think ill chuck one in and see what happens.
    #11
  12. Markey
    Offline

    Markey Active Member

    Joined:
    Apr 13, 2004
    Messages:
    2,148
    Likes Received:
    0
    Would the 6 speed from a 53 reg 1.8t fit ? a 1998 ?
    #12
  13. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    YUP indeed it will Not sure if the one i have picked up is a straight fit having looked at it after i got it home. I need to wait until i have the 5 and 6 speed side by side. Just in case i have a v6 box on its way as a fall back position
    #13
  14. Siena
    Offline

    Siena Active Member

    Joined:
    Oct 28, 2007
    Messages:
    2,626
    Likes Received:
    3
    6 speed box is slightly longer.

    6 speed box is slighter wider, so you'll need 6 speed driveshafts.

    6 clutch slave cylinder is slightly larger, you MAY need a 6 speed master.

    6 speed selector linkage is different, you'll need matching linkage.
    #14
  15. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    Thanks Oh Guru !!!
    Off to ebay i go now then, is it 6 speed or 6 speed diesel parts i need?
    #15
  16. Siena
    Offline

    Siena Active Member

    Joined:
    Oct 28, 2007
    Messages:
    2,626
    Likes Received:
    3
    If the 6-speed box you've got is from a diesel, it MAY have the funny, petal-shaped larger flanges, then you'll need 6-speed driveshafts from a diesel. If it just has regular large flanges, then 6-speed items from a petrol car will be fine. Just match the inner CV's to your flanges.

    As for the linkage, it doesn't matter which 6-speed B5 / B6 it comes from, petrol or diesel, quattro or FWD, all are compatible.
    #16
  17. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    Siena

    Will i get away with just using the correct petal inner Cv's on my driveshafts, and will the linkage swap straight over? or will i need to "mod" the car or link somehow?
    Thanks
    #17
  18. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    I noticed the linkage is on the other side of the 'box, so will i need to modify the car in anyway to fit the new linkage?
    #18
  19. Siena
    Offline

    Siena Active Member

    Joined:
    Oct 28, 2007
    Messages:
    2,626
    Likes Received:
    3
    The 6-speed linkage goes into the box on top, just behind the bellhousing. The 5-speed version goes into the box at the rear.

    The 6-speed linkage is a direc bolt-on part, no tunnel modifications required.

    The petal-style inner CV joints don't fit stock driveshafts, the spline is much larger than usual.

    An easier option is to have yours cut down, welded and balanced.
    #19
  20. Broken Byzan
    Online

    Broken Byzan Photographic Moderator Staff Member Moderator

    Joined:
    Apr 26, 2004
    Messages:
    12,578
    Likes Received:
    270
    Thanks, i have to ask, how do you know so much as you know lots of the techie stuff that the rest of us dream of knowing
    #20
  21. Siena
    Offline

    Siena Active Member

    Joined:
    Oct 28, 2007
    Messages:
    2,626
    Likes Received:
    3
    Well, after graduation, I went for my training in Germany, courtesy of Audi, they footed the bill. Then I spent 18 months there. After I returned, I worked for Dovercourt Audi in Plaistow for a number of years, before leaving to do my own thing.
    #21

Share This Page