A500 A518 A618 42RE 46RE 47RE 48RE transmission spring.
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Waved, .075" thick, approximately 5.75" Diameter
Top snap ring in the overdrive direct clutch drum.
This is the one that is common to break.

0.106" Thick X 7.15" Outside Diameter
Top snap ring in the direct drum
Also used in TH400 intermediate application.

Waved, .045" thick, approximately 6.45" Diameter
Bottom snap ring under the overdrive clutches in the OD case housing.