I have replaced the B2 piston and new teflon and black seals on 1981 500SEL Euro Trans 722.302. The fix didn't work still no forward gears but reverse works fine. When I removed the old one it came out in pieces. Anyway my question is if I use a longer thrust pin (49.8 mm) to engage the B2 band will this fix the problem or is there something else it might be