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420A Rough shift/no shift 41te


Probationary Member
Mar 8, 2022
Owasso, Oklahoma
So I have 2g Eclipse GS with a Ultradrive 41te.

I recently replaced the differential gasket with Permatex 81180 and it still leaks but 4 days after which is okay the car started shifting extremely hard and missing not shifting into overdrive at all I checked fluid and it’s good. It was driving fine yesterday. The only thing I can think of that some gaskets broke off and got into the clutches.

Is this fixable with a drain and refill with new fluid? Or is my transmission too far gone?


Nov 14, 2013
Independence, Kansas
Any codes from the TCU?


Proven Member
Feb 9, 2019
It's hard to say with little info but I don't think a simple drain and fill will solve your problems. It would be a cheaper solution so definitely worth trying but it sounds like there is a deeper issue.

As unprofessional as it may sound, try adding some Shutter Fix to the fluid. You'd be amazed how many Ford transmission issues I have band aided and it worked for up to a year of daily driving.
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