Originally Posted By: MolaKule
Originally Posted By: clinebarger
...4L60E's have a tendency to break 2nd clutch Accumulator springs, The Accumulator Housing can be accessed with the pan removed.
Just curious as to the cause. Temper, corrosion, torque twisting...?
Temper &/or just plain fatigue. Also the WIDESPREAD problem of Rebuilders/Shift Kit Manufactures/Even GM at times....Installing/Sending incompatible accumulator spring/piston/housing combinations.
Anytime the springs experience Coil-Bind their lifespan is severely compromised, You can't assume anything. The Inner cushion spring is the most apt the break from coil-bind in stock applications, GM put to long a spring in several thousand 4L60E in the '96-'98 time frame trying to correct harsh 1-2 shifts, The spring was heavier & helped until the spring broke. The spring wouldn't bind unless the line pressure got high enough which is basically only WOT.
The accumulator spring that are sent with Trans Go shift kits are JUNK, They run 3 springs that run right next to each other, The skinny wires get caught it the adjacent spring & they break up ruining the Housing & Piston.
I check every combination before final assembly using "Test" housings with the piston & spring combination I plan on using.
I apply some gear marking compound on a couple coils, Load the springs & piston into a test housing, Compress the piston all the way, Check the spring for coil bind.
The longer spring will work with the Piston with legs, But will coil bind if the legless piston is used.
Using the shorter spring with leg piston will render the spring less effective & a harder 2nd gear will result
GM Part# 24209794 Outer accumulator spring can be used in ALL Piston & Housing combinations & they rarely break.
The coils are Ovate wire & can compress further than a round wire spring while keeping the same rate
Trans Go spring destruction