1996 O/D light flashing
 

Okay has been going on for a few weeks now. When i start my truck in the morning and try to drive the truck starts to shake and the O/D light flashes. And yes i am in gear. Also the O/D light comes on when the transmission goes from 2nd to 3rd gear. I know that the bands in the Tranny are going bad, but does can that really cause the O/D light to come on? I had an 1993 ranger with bad bands and this never happened. Truck specs below

Year: 1996
Make: Ford
Model: Ranger
Drive: 4x4
Engine: 3.0 V6

1996 uses 4R55E transmission with 6 solenoids
1993 used A4LD trans with 2 solenoids

While they are the same transmission the 4R has more electrics for better monitoring and shifting of trans.
OD Light flashing means a problem with electrics in trans, there is probably transmission codes set, P07XX
Most OBD readers can see these codes, but not all

Ron i have the codes. PO756 and PO761. I also have a code for PI405, something to do with Diff Pres Feedback Sensor. Not sure how to get to that. I know that PO756 and PO761 are Shift solenoid B an C. Just not sure how to replace them.

P1405 is for the DPFE sensor, DPFE = Differential Pressure Feedback
Its part of the EGR(exhaust gas re-circulation) system

Look here for what it looks like: https://www.ford-trucks.com/forums/5...locations.html

It has 2 hoses that run to Exhaust system, they are not vacuum hoses, usually they connect to the EGR pipe, and they are different sizes, so don't mix them up.
Check both hoses for cracks or breaks, and pull each off and blow thru it, engine cold and off of course, lol

P1405 means: Diff Pressure Feedback Sensor Upstream Hose Off/Plugged
Sensor itself may be plugged as well so after checking hoses you may need to pull the sensor off and check it.

P0756 and 761 means those solenoids are not working electrically, you need to test them using an OHM meter, you can do that from the connector on the side of the transmission.
Solenoids can be change by dropping the transmission pan, but you may want to just pull trans for a rebuild.
Up to you

This is a good simple video on how automatic transmissions work: youtu.be/szu-0IqMygA

Bands are the brakes inside, clutches are the drives, these set the planetary gear at different ratios.
Bands and clutches are operated by PRESSURE, before electrics there were balls and springs in passages that were pushed open by PRESSURE so shifting could be erratic at best, lol, depending on internal pressure
Solenoids took the place of most of the balls and springs so shift points, when brakes(bands) were engaged and clutches, could be better controlled.

But the transmission still operates the same way, PRESSURE, without it trans can't work well, REVERSE needs highest pressure so if there is a pressure issue you will usually start to notice it when reverse is slow or won't engage.
REVing the engine increases pressure.
Pressure is lost by leaking gaskets and seals internally.
Or worn out Front Pump(main Pump)