I had to replace the carrier rear mounts (2) on my 260 when I installed the 3.07 gears. Both of them were shot.
http://bos-engel.com/benz/p6220016.jpg
I also replaced both side seals. Oh, and I'd buy an ABS speed sensor o-ring in advance since both the one on my 260 and the one on my 300 donor car broke when I pulled out the sensors.
The only other thing I can think of is that there are shims placed at the carrier front mount and they determine pinion angle.
http://bos-engel.com/benz/p6230021.jpg
You want to look at markings on the carrier at the front mount boss. IIRC there are some marking there and they indicate the shim thickness. I was lucky in that I could swap the shims from my donor 300E. Did you get the shims with your ebay purchase?
http://bos-engel.com/benz/p6220016.jpg
I also replaced both side seals. Oh, and I'd buy an ABS speed sensor o-ring in advance since both the one on my 260 and the one on my 300 donor car broke when I pulled out the sensors.
The only other thing I can think of is that there are shims placed at the carrier front mount and they determine pinion angle.
http://bos-engel.com/benz/p6230021.jpg
You want to look at markings on the carrier at the front mount boss. IIRC there are some marking there and they indicate the shim thickness. I was lucky in that I could swap the shims from my donor 300E. Did you get the shims with your ebay purchase?