Between flywheel and crank

http://forums.y-blocksforever.com/uploads/images/341e7f80-474b-4613-a265-3389.jpg

The photo is showing the torus cover (7910). That bolts directly to the flywheel with a large gasket to contain the fluid (see PARTS ILL above). The fluid contacts the flywheel also (unlike a more understood torque convertor). Without the gasket between the crank flange and flywheel, you will have leakage.

One area where the Hydra-Matic differs from contemporary automatic transmissions is the fluid coupling, which is not a torque converter, but a torus. A torque converter uses a stator, which allows it to multiply the engine's torque; a torus does not have this feature. The use of a torus is part of the reason the Hydra-Matic has four speeds; first gear is extra low (3.82:1 on early units, 3.96:1 on later designs) to assist in accelerating from a stop in the absence of additional torque and fourth gear is 1.0:1, not overdrive as found in later four-speed automatics.

SOURCE - https://www.hemmings.com/stories/article/gm-hydra-matic

TRY HERE - https://www.fatsco.net/

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Author	Message
KULTULZ	Posted Last Year
Supercharged Group: Forum Members Last Active: 4 days ago Posts: 1.6K, Visits: 304.7K	The photo is showing the torus cover (7910). That bolts directly to the flywheel with a large gasket to contain the fluid (see PARTS ILL above). The fluid contacts the flywheel also (unlike a more understood torque convertor). Without the gasket between the crank flange and flywheel, you will have leakage. One area where the Hydra-Matic differs from contemporary automatic transmissions is the fluid coupling, which is not a torque converter, but a torus. A torque converter uses a stator, which allows it to multiply the engine's torque; a torus does not have this feature. The use of a torus is part of the reason the Hydra-Matic has four speeds; first gear is extra low (3.82:1 on early units, 3.96:1 on later designs) to assist in accelerating from a stop in the absence of additional torque and fourth gear is 1.0:1, not overdrive as found in later four-speed automatics. SOURCE - https://www.hemmings.com/stories/article/gm-hydra-matic TRY HERE - https://www.fatsco.net/ ____________________________
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KULTULZ	Posted Last Year
Supercharged Group: Forum Members Last Active: 4 days ago Posts: 1.6K, Visits: 304.7K	See if this helps explain it - https://www.youtube.com/watch?v=GL6s2DwqH_0 The above video is third in a series of five. The fifth video shows assembly and includes the torus assembly (towards end) showing the gasket placement in question. ____________________________
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Between flywheel and crank

Between flywheel and crank

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