Good point Doc! Can I use your post to illistrate? :>)
In 1968, GM switched these light duty transmissiions to a 'clutch engaged' reverse/manual-low instead of the band-type grab that they had previously used.
Trouble is, now we have a cast-iron/steel pressure plate living against that aluminum case.
When reverse is engaged, torque makes that pressure plate want to 'rotate' or 'walk' counter-clockwise in the case. Iron against aluminum translates into wear (ruins the case) and this "anti-clunk" spring is used to minimize that movement and/or wear (somewhat). :>)
On a four-wheel drive vehicle, the case is the very first thing ya look at. Over time, off-idle engagement of reverse will eat right thru those soft case lugs.
I was lucky in that my transmission is a SRTA and shows no wear whatsoever; I'm tempted not to even go any further as far as re-build because of the minimum wear of this tranny (I know I won't tho). :>)
Sorry 'bout the picture. It is of an old 700-R4, which GM only used for 2 years.
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