My grand marquis (98) has a hard time shifting or slips around 2 an 3 gear an at same time when cold runs fine but warmed feels heavy

20

Asked by Dec 16, 2015 at 10:26 PM about the 1998 Mercury Grand Marquis 4 Dr LS Sedan

Question type: Maintenance & Repair

7 Answers

765

Most likely the clutch pack in the trans are worn out. If the fluid is burned you could have a qualified technician flush the transmission with new fluid to see if that helps.

Best Answer Mark helpful
20

Well the tran fluid has been replaced an didn't help.

1 of 1 people found this helpful.
20

Was thinking might be a tran solenoid.

1 of 1 people found this helpful.
765

Trans solenoids usually fail at any temp. A good transmission can diagnose it for you at a reasonable cost. But i suspect it will need rebuilding.

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20

How would I diagnose it

1,325

It's probably shot, but try Lucas transmission additive, just in case it's sticky valves. I've seen miracles happen.

1 of 1 people found this helpful.
20

I've put some before. After the first change. I put the entire bottle. An rest with tran fluid.

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