You can get them from monster transmission. Also you can get them from GM dealerships. If they aren't cracked or noticeably worn I wouldn't even spend the money. I have yet to find a kit with the accumulator pistons in it. The last 4l60e I did it took me 4 tries. One on ebay and 3 at the dealer. Good luck. If you go to the dealer bring the originals with you so when they hand you the part they say is right you can prove them wrong it that is the case.
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