The coupe is finally 5-speed!
Thought I should write up all the parts I used just for me to remember and maybe be of help to someone who's looking to swap.
Getrag 265/6
Getrag 265 bellhousing + clutch + TO bearing + pivot arm + clutch slave cylinder (I already had all this on my 4 speed setup)
Transmission crossmember part # 23711175731
2x Rubber transmission mounts part # 23711175732
Shifter platform part # 25111205386
Lower shifter ball cup part # 25111207744 (everything above the shifter ball is the same as on the 4-speed)
2x Transmission-to-shifter platform mounts part # 25111202842 (same ones as on the 4 speed transmission-to-shifter platform)
Swaybar end bushing (goes between shifter platform and tunnel) part # 31351125712
Foam pad (goes between shifter platform and tunnel) part # 23411200936
Febi -made in Germany- e34 M5 35mm guibo part # 26112226527
6x e34 M5 M12X1,5X60 hex bolts part # 26111225754
6x e34 M5 M12 lock nuts part # 07129900047
Shortened front driveshaft (shortened 85mm in my case with 35mm M5 guibo and the shortest Getrag 265 output flange)
10mm shortened nose of the front driveshaft (it would otherwise bottom out with the 35mm guibo)
10mm shortened gearbox output shaft (it would otherwise bottom out with the 35mm guibo)
Other things to consider:
I had to make two mounts to be able to bolt the transmission crossmember to the tunnel (see pics)
Because of these two extra mounts, I needed to shim up the gearbox by putting a couple of washers between the crossmember and the rubber mounts.
I didn't need a longer (automatic) speedo cable.
A DSSR + bronze bushings everywhere is nice, I finally got rid of much of the slop in the shifter.
The shifter hit the front of the console with my 147mm DSSR so I had to bend it even more than it is originally.
You need to make a new exhaust hanger, there's probably many ways to do it. (see pics)
Aligning the driveshaft is important and takes some work.
Starting point:
Measuring and trying to figure out a good way to make my own DSSR.
This is what I ended up with, the DSSR won't win any prices but it works very well. I was going to use an e21 320i lower shifter (part # 25111220213) but after looking at it I wanted to have an even shorter throw so I ended up modifying the lower shifter that was in the car (not stock e9) I'm well aware that I might end up with a broken shifter since it now has two welds below the ball, but if that happens I'll just use the e21 320i shifter that sits on the shelf. You can also spot the bronze bushings in the shifter.
Old shift rod joint with new bronze bushings.
Driveshaft shortened 85mm.
Nose of the front drive shaft opened up, removed the dust cap + circlip + bushing + spring and preparing to cut away 10mm.
With 10mm of the nose cut away, there's nothing to hold the cut down spring + bushing in place anymore since the slot for the circlip is removed, so this is how I solved it, maybe someone else has a tidier solution? Remember to also cut the output shaft on the gearbox 10mm if you're using the 35mm guibo.
5 speed installed, here you can see the two mounts I made for the crossmember.
Shifter platform bolted through the existing hole in the tunnel with an M8 bolt (and the swaybar end bushing between platform and tunnel) and I used two nuts to make sure it stays in place. The shifter + DSSR + guibo + driveshaft also installed.
Had to drop the driveshaft center bearing quite a bit to get it to align (you can see the nut + washer I used as spacers), also had to cut out the holes on the center bearing to be able to move it more to the drivers side. Now it's straight.
Then I had to figure out a new exhaust hanger, this is what I made but I've seen many different approaches.
And pretty much done!
To crown the swap I got myself a genuine wooden Alpina knob which I've always wanted
This is how the shifter came out, very little slop now compared to before.
Now I just have to wait for some better weather!