 Transmission input shaft seal mystery, have never seen this style seal-should I replace it? |
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| reharvey |
 Dec 15 2011, 11:26 AM
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Senior Member  Group: Members Posts: 573 Joined: 16-July 08 From: N. E. Ohio Member No.: 9,308 Region Association: North East States  |
I have a low mileage 72 trans ( 6000mi. ) that I'm converting to a side shifter. It has a front seal that is very different from the one in the 74 trans that is being used for linkage parts. The black seal in the 74 trans is usually what is found on all the cases I've dismantled. . The sealing area on the blue 72 is inset much deeper into the case and the outer surface sits a machined area not used on the 74 black seal. I'm sure the 72 trans has never been apart so it's an original piece. So, should I knock it out and use the seal that is in the gasket set?
Also got to say that it's great to take a trans apart and see everything inside looks like new! Attached thumbnail(s)  
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| jcd914 |
Dec 15 2011, 02:13 PM
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
I doubt either are original seals. The blue seal is not original, it is a common aftermarket seal, I use to see them all the time.
The blue seal does not have the outer dust seal like the black seal has but the oil seal lip on both seals probably ride very close to the same place on the shaft. Typically the seals have a size imbosed on them which is a set of 3 - 2digit numbers for inner diameter, outer diameter and thickness (probably not in that order) so you should be able to determine the size of the sealk you need to get to replace the one in question. Jim |
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Posts in this topic
reharvey Transmission input shaft seal mystery Dec 15 2011, 11:26 AM
02loftsmoor Contact Dr. Evel. Dec 15 2011, 02:15 PM Richard Casto To do the side shift conversion you already have i... Dec 15 2011, 03:00 PM
reharvey
To do the side shift conversion you already have ... Dec 15 2011, 04:02 PM Cap'n Krusty The blue seal is an early version, used on 356s an... Dec 15 2011, 03:00 PM Richard Casto Be careful to not scratch the bore in the case whe... Dec 15 2011, 04:13 PM reharvey
Be careful to not scratch the bore in the case wh... Dec 15 2011, 04:19 PM |
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