My 1996 chevy C3500 crew cab, shifts really hard sometimes, especially if its raining, If i start it up and go from park to drive and it shifts hard, I turn the motor off and try again and it is fine. It might do every day for a week and then not do it for months or sometimes it might do it once a week. What could it possibly be?
Have you ever changed the fluid and filter. If not do that first. Use the new DEXRON VI ATF.
SOURCE: shifting problem
One solution could be the break/safety solenoid. Make sure that the break/safety solenoid is clicking. If it isn't clicking, the AT gear shift is not going to move. If the break/safety solenoid isn't working you can get around it by releasing the AT gear shift with a key on top of base of the steering wheel, but (WARNING) you will have no break lights. I repeat NO BREAK LIGHTS.
SOURCE: 1995 Chevy S10 Blazer
IT IS NOT GOING INTO NEUTRAL. IT HAS LOST THE DIRECT DRIVE CLUTCH PACK INTERNALLY. SOUNDS LIKE IT IS HIGH MILEAGE. IF SO AND YOU CHANGE THE FLUID IT CLEANS UP ALL THE VARNISH IN THE TRANNY AND THE END RESULT IS TRANNY MALFUNCTIONS DEPENDING ON WHAT KIND OF CARE IT HAS HAD IN THE PAST.
SOURCE: 4L60E Shifts fine in 1st, 2nd, & 3rd but will not shift into OD
The EMC detected and problem so it's in limp mode, As long as it's in limp mode the 4th and OD will not activate. Take care not to burn up the transmission by running it hard while your in the limp mode.
Your going to have to get the truck scanned to clear any codes and why there are DTC codes. Auto Zone scan for free and most auto shops charge $10.00 to $20.00 to scan sine they want the business.
If you want to clear the codes your self you can put the ignition to the run position and pull the ECM (Batt) fuse out for 20 sec and place it back in then start the truck. It may stall but let it, just start it again and this would have cleared all the DTC code history.
The transmission should be running fine unless there is a problem and the service engine light will be on again and you'll be in limp mode still with an updated DTC in the ECM.
Good luck and hope this helps.
SOURCE: Car shifts hard (up & down), especially shifting to reverse.
that delayed reaction may be the transmission slipping. with those many miles it could be the transmission going bad
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