Originally Posted by Guitar Jones
Originally Posted by John_Kunkel
Originally Posted by CMcAllister


What is actually accomplished by pulling the springs and blocking it?


This effectively cancels the cushioning function of the accumulator...makes a firmer 1-2 upshift but risks damaging the rear clutch.

How can it damage the rear clutch when it is already applied in all forward gears? The only thing happening on the 1/2 shift is the front band is applied unless you manually shifted from 1st to 2nd with an auto shift valve body or a rear band apply manual valve body. In which case then the rear band is releasing on the 1/2 shift. At no point is the rear clutch released and re applied, it is constantly applied 1/2/3.
What damages the rear clutch is shifting from reverse to drive without coming to a stop. Effectively using the rear clutch as a vehicle brake.


The accumulator outer spring cushions the initial application of the rear clutch i.e. from N to D or 1. Without the spring, the rear clutch piston applies harder and can overwhelm the Belleville spring causing it to break or pop the piston out of its bore.

Busted Bellevilles.jpg
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