B5 A4 rear sub-frame

Mark Rosenkrantz speedracer.mark at gmail.com
Tue Sep 20 07:43:28 PDT 2011

I've never seen that before, but it does look like a crack which formed over
time.  It could be welded, but your alignment might never be 100%, and I'd
remove it as to not burn the bushing and to weld/clean from both sides.  So,
a used subframe and bushings would be my vote.

Mark Rosenkrantz

On Mon, Sep 19, 2011 at 5:52 PM, Tony Hoffman <auditony at gmail.com> wrote:

> Hmm, I've worked on quite a number of B5's never seen that before. I'd be
> searching for a used subframe, should be pretty easy to find. B5's are
> plentiful. Depending on where you live, you might check with Chris Semple
> at
> force 5.
> Although, I really don't see any harm in welding it, either. Just make sure
> there is good penetration on the metal (and clean it very well first). But,
> I'd still find a used one.
> Don't think your tires nor the sport suspension caused that one. Wondering
> if it was just a build defect, or perhaps it had hit something in the road
> before that caused a slight crack, adn it only got worse.
> Tony
> On Mon, Sep 19, 2011 at 2:38 PM, Chuck Storms <cstorms75 at yahoo.com> wrote:
> > I have a 2001 A4 Avant with 130 kmi. on it, heard a clunk in the rear the
> > other day so on a slow afternoon at the shop I threw it on the lift to
> find
> > that the rear sub-frame is tearing, from the sway bar mount area down to
> the
> > control arm mounting bolt area on both sides.  For a little history I
> have
> > owned the vehicle for less than a year and approx 8 kmi..  I am running
> > slightly wider rubber than stock (225/50 instead of 205/55/16), but it
> > appears that somebody attempted a repair in the past.  The car is loaded
> up
> > so it has the sport suspension etc...   I'm just wondering if anybody has
> > run into this before and if there is anything to be done in addition to
> > welding it up with some gussets or getting a used sub-frame (too much
> like
> > work). Posting a link to photo's if it helps at all
> > http://www.flickr.com/photos/glur/sets/72157627583181041/
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