I have replaced the speed sensor in diff. with no change. it works sometimes for about 5 miles then stays on 40 mph.the cruise still works fine.if i shut the truck off and beat on the dash the speedometer will come down slowly to 0, and when i try to drive it again it will immediately go back to 40
Have your alternator checked. I had a Lincoln that had the odometer and speedometer recording at a stop. Turns out it was stray voltage from alternator traveling through my chassis.
SOURCE: 99 ford f350 powerstroke cruise control
There actually is a Fuse and a Relay for this. There should be a Fuse in the Cab Fuse Box and a Relay in the Fuse Relay Box under the Hood. These are where I would start.
SOURCE: Ford F350, 7.3 powerstroke, accelerating from 0-60
does it have acentre bearing in the tail shaft ?if so ,fhat is more than likely the problem .also check that all the tail shaft yoke s are in line,they only have to be 1 spline out togive those symptoms ,a rumble ,is definatly coming from the driveline
SOURCE: My 1995 F350 Powerstroke "Shutters"
VIBRATION - DRIVELINE RESONANCE/VIBRATIONBETWEEN 1400 AND 2000 RPM WITH CONVERTER
Clutch ENGAGED DURING MEDIUM TO HEAVY
THROTTLE CONDITIONS - VEHICLES WITH 7.3L DI
TURBO ENGINE AND TRANSMISSION BUILT PRIOR
TO 11/13/95 (5L13)
^
TRANSMISSION - E40D - DRIVELINERESONANCE/VIBRATION BETWEEN 1400 AND 2000
RPM WITH CONVERTER
Clutch ENGAGED
DURING MEDIUM TO HEAVY THROTTLE
CONDITIONS - VEHICLES WITH 7.3L DI TURBO
ENGINE AND TRANSMISSION BUILT PRIOR TO
11/13/95 (5L13)
FORD:
1995-1996 E-350, F-250 CREW CAB, F-350 CREW CAB
Article 96-26-21 is being republished in its entirety as part of a consolidated 7.3L diagnostic aid booklet.
ISSUE
Some vehicles with transmissions built prior to 11/13/95 (5L13) may exhibit a driveline resonance/vibration between 1400 and 2000 RPM with the torque convertor engaged. This may be caused by the torque converter.
ACTION
Prior to torque converter replacement, refer to the following Service Procedure for details to verify conditions.
SERVICE PROCEDURE
1.
Verify the resonance/vibration does not occur in neutral and is most noticeable between 1400 and 2000 RPM with the converter clutch engaged during medium to heavy throttle conditions. Also watch for the vibration to diminish at engine speeds lower than 1400 and higher than 2000 RPM. If the concern meets all of these conditions and the transmission has a built date prior to 11/13/95 (5L13), replace the torque converter. Refer to the appropriate Service Manual for removal and installation procedures.
2.
If the vibration concerns do not meet the conditions, check for non-factory installed items that could affect driveline and verify proper installation. Also refer to the appropriate Service Manual, Section 05-00 for diagnosis and testing.
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