4R44E slipping in reverse

[srmauer]

I have a Ford Ranger with a 2.3 liter engine and a 4R44E transmission. My transmission has started slipping in reverse under acceleration. If I idle back, it will back up fine but if I try to accelerate in reverse, it will start to slip. It isn't a gradual slip. It feels like it goes into neutral. There is a definite breakover point. I have searched many forums for hours but have not seen this problem addressed. Thanks for your help. Steve

 

[sheltonfilms]

The servo piston for the reverse band is accessible in the valve body. Probably have a blown out valve body gasket at the servo cover area.


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[srmauer]

I am going to pull the valve body this weekend. Does anyone offer an upgrade kit that would be a reasonably simple job to install while I have it out? All forward gears shift fine as of now.