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Expert
Posts: 2264
Location: McComb, Mississippi | My 63 Imperials Torqueflite has a small leak after I park the car. It's dripping from the pan rail, but is not the pan. So far, I've replaced the torque converter seal, speedometer seal , kickdown linkage seal, pushbutton and park cable seals, NSS seal, and dipstick tube seal. I've made sure the pan flange is straight and put heat shrink tubing on both cables. From what I can tell, the leak appears to be originating from the back half of the trans. I have confirmed that the tailshaft seal is not leaking. Any ideas where else to check? Thanks
Edited by plymouth 2019-10-05 10:00 AM
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Expert
Posts: 3393
Location: Chestertown, NY ( near Lake George) | May be worth getting a leak detector dye kit, to pinpoint the source. You have covered the usual suspects, may be in the casting somewhere. |
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Expert
Posts: 3775
Location: NorCal | One of the most insidious 727 leaks is the rear band lever pivot shaft; this shaft has an O ring that leaks out onto the pan rail and appears to be coming from the pan gasket. Unfortunately, on the pre-'66, the end of the pin is hidden in front of the Park module and can't be accessed without removing the tail housing. An additive like Lucas or Trans-X might stop the leak.
(Rear Band Pin.jpg)
Attachments ---------------- Rear Band Pin.jpg (59KB - 177 downloads)
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Expert
Posts: 2264
Location: McComb, Mississippi | I didn't even know there was a seal back there. I bet that's the culprit. I may get the dye and confirm that. Thanks |
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Expert
Posts: 3775
Location: NorCal | Here's what the shaft and O ring look like, leaks here are so common that in later years they added a second O ring.
(Rear Band Lever Pin.JPG)
Attachments ---------------- Rear Band Lever Pin.JPG (152KB - 176 downloads)
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Expert
Posts: 2264
Location: McComb, Mississippi | Hmmmm.. well, since I don't really want to pull the pan again, I might just drain a little fluid out, clean around that shaft with brake cleaner and use a little Ultra Gray. |
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Expert
Posts: 3775
Location: NorCal | That's the procedure I recommend but access if pretty limited. There is a tab on the tailhousing to prevent the shaft from coming out; if you can, push the shaft forward as far as possible to make room for mo9re sealer. |
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