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Eric, Automotive Repair Shop Manager
Category: Jeep
Satisfied Customers: 32553
Experience:  20+ yrs. experience as repair shop manager and technician.
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A local mechanic just changed the transmission valve body

Customer Question

a local mechanic just changed the transmission valve body due to 2008 grand Cherokee going into limp mode. Looks like that is fixed but now the transmission make a hard shift when slowing down at 10 MPH when it down shifts from 2nd to 1st gear. any ideas on what is causing this. Mechanic said it needs to be broken in and just drive it
Submitted: 1 year ago.
Category: Jeep
Expert:  Eric replied 1 year ago.


Did he use a new or used valve body?

Customer: replied 1 year ago.
They used a new part from jeep
Customer: replied 1 year ago.
Can this new part be defective
Expert:  Eric replied 1 year ago.


Usually a harsh downshift from 2nd to 1st is due to the torque converter clutch coming out of lockup late.

This may be due to incorrect fluid level, torque converter clutch solenoid fault, faulty torque converter, or faulty valve body.

Because this was not present before valve body replacement, I suspect that either the new valve body is defective, incorrect installation, or the fluid level is incorrect.

Customer: replied 1 year ago.
They did look for fault codes one day last week and said the car did not have any codes stored.
Would any of they above mentioned issues create a code
Customer: replied 1 year ago.
Is there a break in period for the new valve body
Expert:  Eric replied 1 year ago.


Only the torque converter clutch solenoid would set a fault code.

No, there is no break in period for the valve body. It either works correctly when installed or doesnt.

Expert:  Eric replied 1 year ago.

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Customer: replied 1 year ago.
Need more time
Expert:  Eric replied 1 year ago.


no problem