That would be a hard shift for sure.2003 dakota v-6 auto 4 wd. When it shifts down on a hill the shift just about rips your head off. Turning off o/d doesn't seem to help at all.
The control valve body is inside the transmission.Where is the valve body? It only happens going up hills, It's impossible to drive it in cruise control because it happens so abruptly. And taking it out of overdrive does not do anything, I'm not convinced o/d actually works. A used truck that has had nothing but problems.
Turns out over drive works. But still very harsh shift uphill when turned off.[/QUOTE]
The overdrive is a separate unit, controlled by a solenoid and some clutches.
On the 46re transmission (on mine) the shift into overdrive
(4th gear which is a reduced o/p shaft to input shaft gear ratio) is controlled by:
Front clutch; Rear clutch; overdrive clutch.
So I presume from the clutch and band application truth table, that
the front clutch (controlling the front planetary gear set) and
the rear clutch (controlling the rear planetary gear set) and the overdrive
clutch all play a part in achieving overdrive.
If the transmission will not shift into 4th gear, the control switch (on the
turn signal stalk), the overdrive solenoid or related wiring may also be the
So you need to determine through a process of elimination which
transmission unit is at fault in your casem and you have determined (I presume here)
that it's the 3-4 shift on a hill, where the engine rpm is dropping off due to the extra
load on it while in O/D?
The overdrive unit components are listed in brackets ( )
With transmission in Drive;
shift lever transmission clutches and bands ( overdrive clutches)
reverse: front clutch & rear band applied (direct clutch applied)
D (1st): rear & overrunning clutch applied (direct overrunning clutches applied)
D (2nd): front band & rear clutch applied (direct clutch& overrunning clutch applied )
D (3rd): front clutch & rear clutch ( direct clutch & overrunning clutch clutch applied)
D (4th) ** : front clutch&rear clutch applied ( overdrive clutch applied)
So from this truth table, you can see that it's a bit more complicated to
diagnose what component(s) are causing your hard pressure UP shift problem.
If the transmission fluid has not been changed and the mileage is getting
up there, perhaps that has something to do with the abrupt shifting?
At what mileage was the tranny last serviced?
My manual says for:
"NO 3->4 Upshift"; possible causes may be:
1. O/D switch in OFF position
2. Overdrive circuit fuse blown
3. O/D switch wire open or shorted
4. Distance or coolant sensor malfunction
5. TPS malfunction
6. Neutral sense to PCM wire open or shorted
7. PCM malfunction
8. Overdrive solenoid open or shorted
9. Solenoid feed orfice in valve body blocked
10. Overdrive clutch failed
11. Hydraulic pressure low *
12 Valve body valve stuck ***
13. O/D piston incorrect spacer
14. Overdrive piston seal failure
15. O/D check valve/orfice failed ***
For delayed 3->4 upshift (slow to engage)
1. Fluid level low
2. Throttle valve cable mis-adjusted ****
3. Overdrive clutch pack worn or burnt ****
4. TPS faulty ****
5. Overdrive clutch bleed orfice plugged ****
6. Overdrive solenoid or wiring ****
7. Overdrive excessive clearance
8. O/D check valve stuck ****
**** most likely
For harsh shifts 3-4 Lockup solenoid malfunction (remove valve body and replace solenoid)