reverse intermediatly out on 1992 f150

[dblair]

I have a 1992 f150 with a 302, and reverse will work when the fluid is thick or cold. I was told once that i need to replace an o-ring on the piston. When the fluid comes to temperature reverse will slip or not work at all. All of the other gears work flawlessly. Any information would be helpful. Thank you

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[dirtyd0g]

Probably need to replace the reverse servo.
Alan