The actuator has a single center diaphram, if the lower side is not leaking then the diaphram is good. If the problem is only going up it is the rod seal. The repro rod seals are thinner than the originals and tend to seat poorly on the actuator, weatherstrip glue can improve the seal and prevent them from detaching (which can happen with those repro seals). On the rod side if it is an original actuator make sure there is no rust on the rod and then weatherstrip glue the seal at the proper point on the rod (where the grove is)
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My Break Away Squad
1969 Fbird (base OHC, 350, 400HO & Sprint Cvt’s - 400HO & TA ht’s)
1969 Custom S 2dr ht
1969 LeMans (2dr & 4dr ht & Cvt)
1969 LeMans Safari wagon
1969 GTO (2 Cvt, 2 ht & Judge ht)
1969 Cat (3 Cvt’s & a 2dr ht)
1969 Ventura wagon 2 seat
1969 Exec 4dr post
1969 2 Bonnie Cvt's & 2 wagons
1969 Bonnie Brougham (4dr ht & Cvt)
1969 Grand Prix 2 SJ’s
1969 2+2 2dr ht (Canadian)
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