Tranny Shift Problem

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Mar 1, 2009 | 02:35 PM

mark_fussell

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Tranny Shift Problem

!997 F-350 Auto - was having problems with transmission not shifting into 1st. Would do so when starting truck, and shifting from park, and will shift to first when I put it in first gear. Sometime will shift down if at a red light. Won't shift into O/D. O/D light flashing sometimes, sometime not. If it sits over night O/D light does not shift for 20-50 miles.

Blew front pump seal, dropped tranny, replaced seal could find no other problems, filled with fluid, went back to the same problems. Mechanically it feels fine, shifts 2-3 as expected. Took it to have error codes run, computer had no codes even with light flashing. Speed sensor replaced 300 miles ago- Any suggestions? It acts as if it is an electrical problem. Thanks in advance

Mar 1, 2009 | 03:26 PM

DRRXR

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From: Texas Coast

Did you see any metal when you dropped the tranny?

Mar 1, 2009 | 03:27 PM

mark_fussell

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None, clean a could be, no wear, of any type

Mar 1, 2009 | 03:37 PM

DRRXR

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From: Texas Coast

You should get the pressure checked for each gear. You may have a electrical issue or you may need a valve kit. Not sure. Good thing on not having any metal. Mine was acting simular to yours without the flashing. My TC croaked on mine.

Last edited by DRRXR; Mar 1, 2009 at 03:38 PM. Reason: typo

Mar 1, 2009 | 03:40 PM

DRRXR

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From: Texas Coast

Maybe MADVAN will come on line and drop you a tip.

Mar 1, 2009 | 04:16 PM

mark_fussell

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Valves etc were checked about 6000 miles ago, looked like new, nothing inside that seems to be causing the problem. No pressure problems we have been able to find

Mar 1, 2009 | 05:35 PM

mark_fussell

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I unhooked the batteries for an hour hoping to reset from the "Safe-mode". Is is possible/probable that the whole problem is that the transmission is still running in "Safe-mode" and had to be cleared? I had it checked before with a hand scanner and I do not know if it could pick up transmission codes. If this may be the problem and suggestions on how to clear the computer and get it off "Safe-mode"?