Re: 1968 GMC 250 In-line 6 Rear Mail Seal
OP
hard to see in your pic if there is a wear line from original seal which is why the offset type seal is made so it ideally rides on a fresh surface.
If it were me, I would use the offset version even after polishing as Rusty notes....especially given you tried the standard version
I believe the stagger the RMS thing was more done on the old rope types on those replacements. Not sure if it was more effective as rope types were...well rather wet seals regardless
My 250 also has a RMS leak. just a drop or two after long drives but so far I have held the position...is the juice going to be worth the squeeze....more based on your current outcome and same opinion of those who do it for a living under it's current minimal leak condition. I just use a pan under truck which shows a very small drip smaller than a dime.
Oil takes the path of least resistance to drip out which is why it appears it is staying on the engine side of FW......so far mine appears to not have affected the clutch also
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