Before I make the same mistake twice...

[Bimmerfanatik]

Lost a brand new flex disc on my car, most likely due to the trashed subframe bushings and the car torquing the shit out of the driveshaft as a result. Most likely lost the CSB as well.

In any case, when I removed it the first time, I felt some slight notches basically at the center points of the u-joints. Is this normal? Not a big notch, but definitely something you can feel. Does it need to be completely fluid in every direction?

Also, need to change the guide bearing at the end of the front half of the driveshaft. Can I just cut the old one out?

Thanks - gotta know fast, as there's another for sale if this one won't cut it.

[Jon325i]

It shouldn't be notchy at all....sounds like somethin's amiss. How is the condition of tranny mounts, diff support bushing, engine mounts? If any of those are worn the driveline isn't being supported properly and over time it can accelerate wear on some items. I would thoroughly check things out and you 'might' need to do something about the driveshaft.

Jon

[Bimmerfanatik]

It shouldn't be notchy at all....sounds like somethin's amiss. How is the condition of tranny mounts, diff support bushing, engine mounts? If any of those are worn the driveline isn't being supported properly and over time it can accelerate wear on some items. I would thoroughly check things out and you 'might' need to do something about the driveshaft.

Jon

Tranny, engine and diff mounts are all fine. When the subframe bushings went the driveshaft took a beating - no subframe bushings meant that every time I accelerated, the driveshaft would buckle and the csb and flex disc took the brunt of it. But when I put everything back in, I remember noticing that there was a slight feeling of notchiness just off center, not huge, but not smooth. I hoped it wouldn't cause an issue, but while I'm replacing the subframe I may as well throw a new driveshaft in...

[Jon325i]

Subframe bushing replacement = teh suck. I don't envy you man.

Good luck with the chore ;-)

Jon

[Bimmerfanatik]

Subframe bushing replacement = teh suck. I don't envy you man.

Good luck with the chore ;-)

Jon

It's not that bad so far - I pulled the subframe off a parts car I have, and it's got brand new OEM subframe bushings in it already. Having it sandblasted along with the TA's and putting it all together. Then I'm pulling my car in, dropping everything, and installing the pre-assembled "new" subframe :)

The only issue I can see coming up is the removal of my current subframe, as there's a part that can get "bound" to the factory posts. Aside from that though, this should be easy.