Put in a can of Lucas Transmission Slip. This stuff fixed my 18 wheel in 100 miles and has lasted 50K since.
SOURCE: transmission shifts hard down from highway gear only (D>3rd)
I had the same thing! It was a computer issue. It only cost me about $35.00.
SOURCE: transmission won't shift into 3rd
the trans has a serious failure, that is why the metal, it can be overhauled for less than a replacement
SOURCE: Auto Tranny slow to shift up tp 3rd. 2001 2500 Van
you may need to change your transmission filter, or adjust the rear band, or replace a faulty shift solinoid
SOURCE: 03 dodge caravan, 105,000 miles,
I'm afraid that the transmission's O/D solenoid malfunctioning or kick down cable may be misadjusted if so equipped.
looking at a rebuilt transmission if you plan to keep the Caravan.
Or, alternatively, could get a low mileage transmission from a salvage yard and have it installed.
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Servos/Accumulators
The servos are hydraulic pistons and cylinders. They resemble the hydraulic actuators used on many other machines, such as bulldozers. Hydraulic fluid enters the cylinder, under pressure, and forces the piston to move to engage the band or clutches.
Servo operation
The accumulators are used to cushion the engagement of the servos. The transmission fluid must pass through the accumulator on the way to the servo. The accumulator housing contains a thin piston, which is sprung away from the discharge passage of the accumulator. When fluid passes through the accumulator on the way to the servo, it must move the piston against spring pressure, and this action smoothes out the action of the servo.
Hydraulic Control System
The hydraulic pressure used to operate the servos comes from the main transmission oil pump. This fluid is channeled to the various servos through the shift valves. There is generally a manual shift valve, which is operated by the transmission selector lever, and a shift valve for each up shift the transmission provides.
Most automatic transmissions are electronically controlled; electrical solenoids are used to control the hydraulic fluid. The shift solenoids are regulated by an electronic control module. Shift timing is regulated through sensor feedback information provided to the electronic controller.
On older transmissions there are two pressures that control the shift valves. One is the governor pressure which is affected by vehicle speed. The other is the modulator pressure which is affected by intake manifold vacuum or throttle position. Governor pressure rises with an increase in vehicle speed, and modulator pressure rises as the throttle is opened wider. By responding to these two pressures, the shift valves cause the up shift points to be delayed with increased throttle opening to make the best use of the engine's power output.
Older transmissions also make use of an auxiliary circuit for downshifting. This circuit may be actuated by the throttle linkage, vacuum that actuates the modulator, or by a cable or solenoid. It applies pressure to the downshift surface on the shift valve or valves.
The transmission modulator also governs the line pressure, used to actuate the servos. In this way, the clutches and bands will be actuated with a force matching the torque output of the engine.
SOURCE: 1996 dodge ram 2500 auto transmission not shifting properly
Well, first do the service. Pull the pan down and look for metal shavings. If there is metal shavings your in for a transmission. If not, you may have a problem with one of the transmissions shift solenoids located near the valve body.
P.S. The Duramax has the Allison 1000 transmission not the dodge cummins and they are one of the best trannys on the market.
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