Question about 1990 Ford F350

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I have a frod f-350 pickup. It shifts from first to second with no problem. From second to third it has a hard time shifting and when it does it shifts very hard.

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Try grounding your Transmission to the frame. This solved my friends problem and was recomended by a transmission shop.

Posted on Jun 18, 2009

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Valves likely hanging up in valve body. There is a kit made by TransGo that is works wonderful for the shifting/calibration issues - as long as there isn't something else failing within.

Posted on Apr 20, 2009

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My 1995 4l80e trans will shift into third only when i floor it but when i let off throttle it seems to go to nutrall and help would be appreashed


run the fault codes and look for faulty servo/solenoids and TCM
it could also be a oil level or oil condition problem
I suggest a visit to an accredited auto shop specialist for a proper diagnosis before you waste money
if a new box is suggested get second and third opinion and quotes

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Here is what the service manual says about the EPC solenoid, the processor looks at allot of different inputs to command the solenoids, such as Throttle Position Sensor, Vehicle Speed Sensors, Transmission Range Sensor and RPM signal, The PCM controls the shift patterns for the transmission. Electronic Pressure Control (EPC) Solenoid
The electronic pressure control (EPC) solenoid is located on the main control valve body and is controlled by the PCM. The EPC controls line pressure used to apply and release clutches and bands in the transmission.
The 2-3 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 2-3 shift solenoid activates the 2-3 shift valve which controls the automatic shifting between second and third gear. Second gear is established when the 2-3 shift solenoid is switched on. The 2-3 shift solenoid is switched off when vehicle speed increases and requires a second to third gear upshift.
The 3-4 shift solenoid is located on the main control valve body and is switched on and off by electrical signals from the PCM. The 3-4 shift solenoid activates the 3-4 shift valve which controls the automatic shifting between third and fourth gear. Third gear is established when the 3-4 solenoid is switched off. The 3-4 shift solenoid is switched on when vehicle speed increases and requires a third to fourth gear upshift.

Mar 23, 2013 | Cars & Trucks

1 Answer

I have a 91 350 chevy suburban, it is shifting hard into first and second gear. It has 245,000 miles. We have changed the transmission fluid but still shifts hard.


Been "twisting wrenches" for 25 plus years. Don't know it all but have come across in these older 350 and 305's that if the engine timimg is off you will get the same symptoms. Have you checked the timing and/or reset it ?

Feb 15, 2013 | Cars & Trucks

2 Answers

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get it serviced as the valve body might be sticking from lack of use!

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1 Answer

Shifts hard from 1st to second gear and second to third.


it could be your fuel regulator located on the top of the right side of the engine a c clip holds it on and it has an 1/8 line runing to the top it tends to set off alot of sensors its about 68 dollars

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95 NISSAN PICK UP WONT MOVE IN DRIVE


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if you are going to fast and down shift of course its a grind maybe your suppose to be on 4th gear not third gear so that means you need to shift to 3rd.

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