Hey Donal,

If you still are researching the B3 friction disc replacement. Here's some other easy things to replace while you transmission is dropped. Some can be some while the transmission isn't dropped but it's a whole lot easier with it dropped.

1. Front Flex plate. Mine wasn't cracked but it was swollen. Had to take it off in the process so it didn't really added any time to put it the new one in. The rear one looked good to me (and I was getting tired) to replace it. (About 90 bucks with new bolts/nuts/washers)
2. Check plastic shifter knuckles...There are two with the clips...less than 5 bucks to replace parts wise. This is if your shifter knob rattles or feels sloppy.
3. Obvious but the transmission pan gasket and filter.

Like Ph2cho said earlier...the front pump seals is critical even if your transmission is not leaking. One of mine was 1/4 torn on the bottom lip when I had it apart. and the O-gasket on the pump was really stiff and felt like it was going to snap into two.

Emerydc8, I bought the rear main seal ($15-20) but when I checked mine out it wasn't leaking nor did the shaft output have any play or wiggle...didn't want to mess with it. But I figure another around $50 labor to replace it is about right from an indy shop if the tranny is already dropped..