In Reply to: Enlarging transmission support brace posted by JTTS on February 08, 2000 at 15:56:43:
I did this one last weekend (along with the X-brace). Do yourself a favor and get box end wrenches to fit the nuts for the tranny mounts: Believe they're 13mm (M3) and 16mm (320i). Tool clearance is really prohibitive for socket wrenches due to the drive shaft coupling.
Also, when you drill out the holes (I used 3/8" bit and kept working until the studs fit), you'll notice anti-rotation features cast into the brace. These will not allow the 320i tranny mounts to sit flat unless you grind notches in the mounts to match. Did I miss that in "Tech Tips"???
Lastly, a floor jack will help to put everything back together -- just make sure to use a nice wide piece of wood to avoid damaging the aluminum brace. It seems the Enforcer + 320i tranny mount is more than the specified 2mm taller than the M3 mount. Just MHO -- YMMV!
Best of luck,