97 4r70w rebuild problems - TCCoA Forums
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post #1 of 2 (permalink) Old 03-06-2017, 07:19 PM Thread Starter
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Robe's Avatar
Join Date: Aug 2012
Location: Seminole, Fl
Age: 40
Posts: 56
97 4r70w rebuild problems

I just rebuilt my 97 trans in my car. I updated to the mechanical diode, jmod , all new pistons and solenoids. I am having a stange problem now that its back together. It shift fine under throttle all the way into od. When I lift off the gas it seems to jump hard out of od back into third for a few seconds then back into od. It does this every time I let off the throttle, otherwise shifts fine. If anyone has any ideas on where to start diagnosing this thing I would appreciate it. Thanks
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post #2 of 2 (permalink) Old 03-14-2017, 08:57 PM
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Join Date: Aug 2002
Location: Camby, IN 46113
Age: 54
Posts: 2,976
Are you sure it isn't the torque converter unlocking and re-locking? I can't think of many reasons it would drop back into 3rd unless maybe there is an issue with the MLPS or TPS.

Also, please tell me that you aren't going full throttle into overdrive.


01 F150 5.4L 4x4 and a 98 Mustang GT vert sitting engineless and without transmission or converter

All my vehicles tuned by BC Automotive (me)

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