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All in all it went well and Im so glad to have my 2000 D2 A8 running like a champ again. The transmission was in superb condition just as foreseen -- EH
Tech Article

Audi D2 A8 Strut Tower Brace

Last Updated: 11/12/2018
Parts Group: Strut tower brace
This article discusses strut tower brace for the D2 Audi A8 (2000 through 2002). If you're not here for the technical analysis but would rather buy a used unit from us, guaranteed to work and fit, then please select the link below.The information herein is based on my own Audi A8 D2 Quattro project cars.

In general, on cars used for performance purposes, one of the aftermarket enhancement is a strut tower brace (also called shock tower brace, or strut brace). This connects the two front strut towers in a way that keeps them a static distance apart, hence reducing body flex (or to put it positively, increases body stiffness) which is a good thing. I can attest to that, having owned an air-cooled VW beetle whose roof had been sawn off in an attempt to make it a convertible. There was so much body & chassis flex that driving it felt comical to me.

The Audi D2 A8 came standard with a strut tower brace, starting with the post-facelift models.

Here's a picture of my pre-facelift A8, without attachment points for the strut tower brace.

Here's a picture of my post-facelift A8, with attachment points for the strut tower brace.

I find it interesting that the contemporary A6 Quattro 4.2 V8 also came standard with a strut tower brace, similar in general design to the A8 part.

On the A8, the brace looks almost like a bridge across a river. The horizontal span is a rectangular, solid aluminum bar part number 4D0805645E.

The base a.k.a. bridge support (which Audi calls a "retainer") is part number 4D0805772E on the passenger side base, and 4D0805771D on the driver side. We sell all of these.

One each side, the strut tower brace base is attached to the body with three 13mm-head silver-colored bolts, 25mm long, part number N90643901.

One each side, the strut tower brace base is attached to the brace with two 13mm-head silver-colored bolts, 28mm long, part number N90168802.
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