1996 F350 tranny shifting hard - Diesel Forum - TheDieselStop.com
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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 02-05-2008, 12:33 PM   #1 (permalink)
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Unhappy 1996 F350 tranny shifting hard

I have a 1996 F350 4x4..the o/d light will start blinking and the tranny will start shifting hard..super chip diag code p1728..I can clear the code and it will run fine for 1/2 day or so then repeat.. leaking some fluid.. any suggestions??? I read something about a modulator valve but don't know if it applies here..Thanks Walker
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Old 02-05-2008, 12:57 PM   #2 (permalink)
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There's no modulator valve on your transmission.

Most likely your torque converter clutch has failed. When it starts to slip the PCM sees that, sets a code (P1728), flashes the OD light, and puts the trans in high line pressure mode to help prevent more damage. The high line pressure causes harsh shifts.
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Old 02-05-2008, 01:21 PM   #3 (permalink)
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Thanks Mark..this problem started about 4 months ago and I've been resetting the code and continuing to drive it..even pulling trailors with it ( I know I know)..does your diagnosis still fit ??? and if so do I just replace the converter ??Walker
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Originally Posted by Mark Kovalsky View Post
There's no modulator valve on your transmission.

Most likely your torque converter clutch has failed. When it starts to slip the PCM sees that, sets a code (P1728), flashes the OD light, and puts the trans in high line pressure mode to help prevent more damage. The high line pressure causes harsh shifts.
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Old 02-05-2008, 01:24 PM   #4 (permalink)
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Get it in to a tranny shop quick and have them install a heavy duty triple clutch TC. Like Mark K said it is your TC slipping. If you wait to long it will contaminate the entire tranny and you will need a full rebuild. This may be the case already but if it just started, you may be able to get away with just putting in a new TC. I have been where you are and went a long time with just changing the TC.
Just don't put in another plain stock TC. The trannys are the week point in these trucks and the stock TC is the week point of these trannys, (at least one of the main week points).
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Old 02-05-2008, 07:41 PM   #5 (permalink)
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Any other opinions ??? will the tc problem show up on a diagnostic test?? Walker
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Old 02-06-2008, 07:08 AM   #6 (permalink)
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The torque converter problem should show up if the tech has the proper tools and knows what he's doing.
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Old 02-06-2008, 04:50 PM   #7 (permalink)
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Vehicle speed sensor is bad, wires to it or bad or the damn gear wheel in the rear diff is missing teeth. I replaced my vss, and the wires. my problem is in the rear end. it puts the trans in limp mode and makes it shift hard. You may notice the mph guage bouncing after 60mph if this is the case.
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