Welcome Visitor! Please take a few seconds and 
- Joined
- Jan 13, 2014
- Messages
- 335
- Vehicle Year
- 2002
- Transmission
- Automatic
My '96 Explorer 5.0/4R70W powered 02 Ranger has suddenly developed a bunch of separate seeming transmission issues:
From the initial install a couple months ago, it's always behaved well when cold. Sometimes the 1/2 or 2/3 shifts have been a bit baulkey/harsh but nothing significant. Have suspected the accumulators, had been planning on a set of pistons and springs for them.
Today, ran fine going to work, but getting off the interstate, things went nuts. Really poor 2/3 shift, o/d light starts flashing, seemed to drop in and out of neutral a couple times, started hunting gears between 3rd and 4th.
Ran an errand an hour later and at first, symptoms were not bad but got progressively worse. Finally tossed a P0720 error code, speed sensor.
So too going home this afternoon. Cold, seemed acceptable at first but quickly escalated to fairly poor. Along with the prior symptoms, the transmission almost seemed to cause the engine to buck a couple times.
Stopped off at a transmission shop on the way home. The proprietor tossed in a trusted speed sensor with no effect but was clearly uncomfortable with working on the Expo drivetrain the Ranger.
Fluid is quite new, about 2K miles, at the proper level and still clean and unburnt. Internally the transmission was spotlessly clean when I changed the fluid and filter prior to the install in the Ranger.
I'm at a loss. Symptoms almost appear electrical, but I can't see the one CEL if the electrics are going nuts along with the fair behavior when cold.
Any ideas anyone?
From the initial install a couple months ago, it's always behaved well when cold. Sometimes the 1/2 or 2/3 shifts have been a bit baulkey/harsh but nothing significant. Have suspected the accumulators, had been planning on a set of pistons and springs for them.
Today, ran fine going to work, but getting off the interstate, things went nuts. Really poor 2/3 shift, o/d light starts flashing, seemed to drop in and out of neutral a couple times, started hunting gears between 3rd and 4th.
Ran an errand an hour later and at first, symptoms were not bad but got progressively worse. Finally tossed a P0720 error code, speed sensor.
So too going home this afternoon. Cold, seemed acceptable at first but quickly escalated to fairly poor. Along with the prior symptoms, the transmission almost seemed to cause the engine to buck a couple times.
Stopped off at a transmission shop on the way home. The proprietor tossed in a trusted speed sensor with no effect but was clearly uncomfortable with working on the Expo drivetrain the Ranger.
Fluid is quite new, about 2K miles, at the proper level and still clean and unburnt. Internally the transmission was spotlessly clean when I changed the fluid and filter prior to the install in the Ranger.
I'm at a loss. Symptoms almost appear electrical, but I can't see the one CEL if the electrics are going nuts along with the fair behavior when cold.
Any ideas anyone?
