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4F27E Slipping after rebuild

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    James Andrews
    James Andrews
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    I own a 2003 Mazda 6 with the FN4A-EL / 4F27E Transmission. After rebuilding and driving around 2k miles, the transmission slips bad in 4th gear when you do anymore than enough throttle to cruise, and 3rd slips if you accelerate kinda hard. 1st and 2nd are fine, you can accelerate as much as possible and it wont slip, but for some reason 3rd and 4th do. The shift solenoids were replaced with remanufactured ones that looked kinda beat up, and I think that’s the issue, but would a shift kit fix it too? the clutches are new. I did a complete rebuild kit – replacing the sliding valves controlled by the solenoids, and the actuators. The seals, clutches, everything was replaced. There are no oil leaks, and the torque converter was replaced as well. Any input would be greatly appreciated.

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