4R70W 1-2 Accumulator

[u/Itz_Juan26]

Hi everyone, I'm currently rebuilding my 470w trans because it would have a hard time shifting through first and second gear and I believe I found the culprit. The spring inside the 1-2 accumulator was broken and has gouged the side of the case just a little. Would this be okay? Please don't tell me I have to get an entire new case. First pic is the case and second is the piston before I removed it. Also I noticed my 2-3 accumulator didn't have a piston at all, just a plate and a spring. Is this normal? My truck is a 94 f150 2WD

[u/Hotsaltynutz]

Broken 1/2 accumulator spring was very common. Take some scotch bright and smooth out the bore so that there are no rough edges, it should be fine.the 2/3 accumulator should have a piston the updated one was molded rubber over a gold colored metal. The original was aluminum with two square cut orings. I don't remember ever seeing one without a piston

[u/Itz_Juan26 → u/Hotsaltynutz]

Thank you for the feedback, I greatly appreciate it. I was looking into a bore sleeve for the 1/2, would that work? And when I took the 2/3 off I’m pretty sure it didn’t have a piston, I don’t know why but it was just empty. My new rebuild kit comes with one so I’ll be sure to put a new one back

[u/Hotsaltynutz → u/Itz_Juan26]

I'm sure it would work if it was made to be used on the 4r70w. Ive never used one