1992 f250 Overdrive light/ shifting hard

[ksimmonsnj]

1992 ford f250 IDI. Today my Overdrive "off" light starting blinkng and my trans has been shifting very hard for the first two gears. I have checked all of the fuses and every thing else seems to be running fine.
I really appreciate all the help.
Thanks in advance

[strokerboy73]

sounds like to me that your tranny is going out. I had a 95 and it did the same thing. the light started flashing and it was shifting hard, and sometimes it would have like a delayed shift. The motor would get to about 2600-3000 rpm and the tranny wouldn't shift up, and then BAM. it would slam in to the next gear.

[gbear]

The OD Light will flash if you set a code for the transmission. The computer will increase the line pressure when this happens and will cause the hard shifts. I would read the codes and see what they say first.

Jim

[ksimmonsnj]

I uplugged the FIPL Sensor near the front of the injector pump, and wiped it off and plugged it back in and messed with the wires coming out of it. When I started it up the light seems to have stoped blinking and shifting normal, but the tachometer was vibrating a little around 500 and took a few seconds to steady itself around 750.
Do you think I may need to replace the sensor, or take it to get scanned or just hope for the best that it doesn't happen again or get any worse.
Thanks again

[gbear]

I would not change any sensors unless the scan indicated it to be the problem. When you shut the engine off it will reset the soft codes in the computer. The code will still show up with a code scanner until the codes are cleared. I would bet you had some slippage in the transmisson and it set a code, then the computer went into limp mode (higher line pressure which caused the hard shifts), but you will not know until you check the codes. If it is starting to slip you may be headed for a rebuild. I would also check you fluid and be sure it is at the right level.

Jim