[AMC-list] 195.6 cranks, flat vs. volcano, manual transmission fitment -- cast iron don't lie

[tom jennings <tomj@xxxxxxx>]

Volcano and flat butts are NOT interchangeable with the manual transmission.
I have both in the shop, plus a mock-up T-96 (input shaft and bearing
mounted in an empty case).



FACT CAST IN IRON: the volcano butt puts the pilot bearing 1" out (towards
the rear of the car) from the flywheel mounting surface. The flat crank
leaves the pilot bearing flush with the flywheel mounting surface (actually
I think it's recessed a few ten thou when installed right).

FACT CAST IN IRON: the volcano butt crank will not accommodate a pilot
bushing for a 3/4" input shaft. The bore hole in the crank is about .810".
(The bore hole in the flat crank is about 1"; I can't measure right now, the
engine's bolted to a stand.)

FACT CAST IN IRON: The 1963 T-96+OD that came in my '63 American, and a T-96
from a 1964 Classic, require 3/4" pilot bushings. I can't vouch for other
years.



The remaining possibility for a manual trans in a volcano-butt motor is the
existence of a shorter input shaft with a smaller pilot diameter.

As far as I can tell from paper research, the ONLY manual transmission
available for this chassis, ever, was the T-96 (and OD variant). I'd love to
be wrong here.
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