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Lost Overdrive, WIERD!!!!! 2001 F250 SD DSL
Every month I drive my truck from VA to NY to work, it is parked for 2 weeks and I drive it home.
This most recent time, on the way to NY, I was at cruse (75mph) cc set and I felt a shutter in my butt ( I didn't hear if there was a noise, radio was too loud), looked down and the RPM's had jumped a few hundered RPM. There was no slipping as I pressed the accel (TC was still locked in). I pushed the OD off button, it lit but no change. I pushed the OD on button, light when off, rpm raised a couple hundered (TC unlocked) and went back down (TC locked). I pulled over and check to see if I had run over something (NO) leaks (NO) fluid level (GOOD) and smell (also GOOD). I continued driving, shifting seemed normal, TC operated as normal and had all gears (except OD). I continued on my drive to NY until the last rest area where I stopped and removed the Banks Big Hoss chip and bypassed the Banks Trans Command. Still had good shifts, proper TC functions but no OD.
A few days later I drove the truck to the store (hoping a cold trans would produce something different), everything as mentioned above seemed to be the same except at 40mph the TC lock up seemed to be very unsteady (unlock with the slightest touch of the throttle), which at that speed and cold it was alway a bit quirky. I could not drive the truck long enough to get the engine or trans up to operating temperature.
Now, history on the trans. I have had 4 transmissions in this truck, they have all been Jasper units (upgraded HD over their stock replacements). One lasted about 20k(convertor failure), next 1 was defective out of the box with the convertor locking in in Reverse but still driveable, third had the same issue as the 2nd and a convertor with a big flair after about 30k. Now the
4th trans is in the truck, I installed a Precision convertor (low stall, billet duramax hub, billet body), I also installed a heavy duty power valve to firm up the shifts and switch the convertor lock up to on off vs pulse. This trans has about 50k on it, Amsoil synthetic fluid flushed at 30k and drain and fills every 10k so the fluid is in good shape and looks/smells fine. The truck sees towing regularly, no more than 8k lbs for 300 miles each way about 10 times per year.
There are NO flashing lights, no check engine light, and no noises even after a long period of driving
Another question to go along with "what do you think it is" is do you think it is safe for a 400 mile drive home or should it be towed ($1000)
2002 F250 SD 7.3 Crew Cab Short Bed that is oh so stock
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2001 F250 SD 7.3
Banks Big Hoss, Banks 6 gun, Banks intercooler
Precision LOW stall convertor
and lots more