I have a dodge 3500 diesel with 120,000 miles. it upshifts late 1-2, 2-3 at 2400/2500 rpm when you accelerate slow. if you put you foot in it seems to shift fine.it also down shifts hard at 30/32 mph when you slow down. Tranny shop says they got it to do it but it didn't throw any codes. Because of the miles it was time to have trans. serviced, they changed fluid and filter, also changed the gov. sensor, gov. solenoid . None of this fixed the problem. Any other ideas what could be going on. It does this most of the time but there are time when it shifts fine with slow acceleration

FORGOT TO SCAN THE PCM I SEE.
check all fuses.?
not told
fails hot and cold engine or both
car must be in transmission DRIVE selected? right?
and foot off gas pedal (accelerator)_ rpm goes to 2000 or up to 6000 rpm . and or
so driving foot off the pedal and RPM goes too high
or in drive, I step on the throttle (gas) and RPM shoots way high
and Never leaves 1st gear. that is transmission failures.
in DRIVE.
if rpm also goes that high right foot doing nothing and in park
that is engine idle control's failing.
we can not see you drive or how. so answers can be a tad hard.
in what gear? PRNDL (choices)
right foot doing what?
and what SPEED is too slow 20 or 85mph? or?
does tranny fail to upshift?

SCAM THE PCM
SEE OF PRESSURE SENSORS OR CONTROLLERS FAIL IN THE BOX.
SLOW ACCEL, IS REALLY NOT UPSHITING.
RPM RISES FAST AND FAILS TO GO FASTER. THE CAR AND OR FAILS TO UPSHIFT.
LEARN NOTICES UPSHIFTS.
IF MISSING OR WAY LATE. AND NOT TO TOP GEAR.

HD 5.9L (360) SMPI V8 "MAGNUM"
Horsepower: 245 @ 4000 RPM
Torque: 345 @ 3200


5.9L (359) HO I6 CUMMINS TURBO DIESEL
Horsepower: 245 @ 2700 RPM
Torque: 505 @ 1600 - 2700 RPM

check tranny fluid level,if good,either pump in tranny is bad or cluthces in tranny is gone bad,how many miles?

How long has it been since the fuel filter was changed?

Seems like we need a tune up . Change the plugs wires, air filter fuel filter. Is the check engine light on. If so have the codes pulled on the car.

bad clucth

About 3 months ago, during my 25-mile commute to the ambulance base where I volunteer, my transmission started acting up. After a few minutes of driving normally, it started to upshift very hard. Each upshift was accompanied by a noticeable "Bang!" and it felt like the car was hitting a pot hole.

I immediately stopped and checked the tranny fluid at a service station, but the fluid level was fine and it didn't have any burnt smell. The car has 76K miles on it and the transmission fluid was changed at 50K per the maintenance schedule. I had no choice but to continue on to the base, driving very gently.

I made a stop about 5 minutes before arriving, to pick up dry cleaning. I was in the cleaners for about 8 minutes, and when I came out the hard shifting had completely disappeared. The car drove smoothly for the next 3 months.

Now, this problem seems to recur any time I drive the car even remotely hard. We're not talking about full-throttle accelerations here, since my everyday driving stays below 2500 RPM to save on gas. But if I'm in a hurry and start driving a touch harder - crossing over 3500 RPM - then the tranny will start shifting hard within minutes. Let it sit for 10 minutes with the engine off, and the problem is gone again

drain transmission fluid, and flush with a product designed for this. Refill with specified fluid and this should solve the problem that you are experiencing. I have a 1998 truck that was doing the same thing and this solved my problem.

have you had the vehicle speed control reprogrammed if not that could be your problem