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RedTRex

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Spring loaded lip seals were not introduced until the '80s.

and that looks like an AMC crankshaft
 

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Spring loaded lip seals were not introduced until the '80s.

and that looks like an AMC crankshaft
How many from the early 70s do you want to see?
 

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401 crank?
Hardly. There would be no seal at the back like that. They used a 2 half seal in the main like anything else. That's no gen II AMC for sure, I'd say not even a gen I because that also used seals in the main - rope seals.
No AMC used a seal at the rear like that, and that's not a bell housing for AMC. I have some of those.
It's bass-ackwards for any transmission setup. Bell housings on AMC bell or open up FORWARD, toward the engine just like Ford, Chevy or Chrysler.
 

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Okay, perhaps my google timeline was off by 10
I have jars of seals my father brought me he bought at the plant where he worked, and have a number from my days as a Briggs & Stratton authorized repair person - NOS - with springs.

In any case - how do you see a spring? It would be inside the backside of the lip, not visible.
This seal actually appears as if the lip is out our direction. In any engine, it would be away from us and we'd see a gap.

Even on this screen - that image is toooo small to see any detail around that area unless, I download and enlarge it.

I have a 401, 343 and 360 laying in my shop, covered up, I should uncover them and get photos of the rear. FRankly, people seem to think they are very different, but in reality, the back end of an AMC V8 isn't much different looking than the rear of a small block for or SBC.
The crank flange is fully proud of the rear of the engine. You have the steel plate, then the flywheel or flexplate, and a gap. This one in the pic has no such provisions. VERY different.
 

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Here is an early style AMC bell housing on an early AMC automatic (made by Borg Warner)

Jeep Gladiator Blown engine under 12K miles 20201001_103421
 

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Because it looks like a spring backed lip oil seal vice a rope seal
It may be just a standard "rubber" lip seal with no spring.
Those were used all over the place well before the 70s. Axle seals, for example.
I don't see where you can tell if it has a spring or not.
Some types do, some types do not. Usually the spring indicates it's sealing against pressure.
Rope seals went out in the mid-60s.
Most engines used a 2 piece seal in the rear main area, not exposed. They used rope into the mid-60s then switched to 2 piece rubber seals.

That seal also looks like it's sealing against a fluid on the viewer side of things - lip out our direction but then it's too small a photo to really tell.
 

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Here's the seal area of any AMC engine, rear main cap is off, the seal rides on the area where you see "knurlin
Jeep Gladiator Blown engine under 12K miles engine-080
g".
 

RedTRex

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It may be just a standard "rubber" lip seal with no spring.
Those were used all over the place well before the 70s. Axle seals, for example.
I don't see where you can tell if it has a spring or not.
Some types do, some types do not. Usually the spring indicates it's sealing against pressure.
Rope seals went out in the mid-60s.
Most engines used a 2 piece seal in the rear main area, not exposed. They used rope into the mid-60s then switched to 2 piece rubber seals.

That seal also looks like it's sealing against a fluid on the viewer side of things - lip out our direction but then it's too small a photo to really tell.
and GM switched to 1 piece in 1986
 

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Is it 2 stroke?
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