Blitz rear suspension help needed.

[Spoolio]

Just finished the rear end on my ESE and not happy at all. It's all as per the manual but basically once past the "driveshafts level" point there is no more up travel available without the turnbuckle and driveshaft starting to bend .

If I take the shocks off the rear end stays up on its own . The driveshaft seems to be the problem as it's too long. If I take the silicone o-ring out of the outdrive then my problems go away.

So I guess my question is, how crucial is the o-ring?