Quote, originally posted by PanEuropean »
If that is the case (ZF failed to install the O-ring), then you have little to be worried about.
ZF does a bench performance test of every transmission after it has been manufactured, to ensure that the transmission performs according to specification. This means that your transmission (without the O-ring) passed the test, and demonstrated that it was able to operate without the O-ring.
Something else to keep in mind - it is entirely possible that ZF changed the construction specification of the transmission to delete the O-ring requirement. This could have easily been done by enlarging the diameter of the boss that the filter fits onto to change it to a ''friction-fit" type of design. If this is the case, it explains not only why you did not find an O-ring, but also why the O-ring is sold separately from the filter itself (vis, to cater to both pre- and post mod designs with the same filter).
Thank you for showing us you knowledge again.
I have measured the filters and they are identical, so I would say with out doubt that the o-ring is missing.
I think the only way I am going to know if any damage has been done is to fit the filter correctly with o-ring, refill and drive.
Or as the phase goes "suck it and see!"