Accumulator: Description and Operation

1-2 Accumulator
The 1-2 accumulator (in the case) is used to soften the 1-2 shift by absorbing some of the pressure directed to the intermediate clutch. Constant line pressure is applied to the middle section of the 1-2 accumulator piston, opposing the intermediate clutch pressure until this pressure is enough to overcome line pressure. The top of the piston is exhausted to the sump.

2-3 Accumulator
The 2-3 accumulator is used to soften the 2-3 shift by absorbing some of the direct clutch pressure. Forward clutch pressure is applied to the top side of the accumulator piston, holding the piston down until direct clutch pressure is enough to overcome it. The middle section of the accumulator is exhausted to the sump. The 2-3 accumulator also helps control forward engagement.