2000 Grand Marquis lurching when shifting from 3rd to 4th gear

2 messages, Last post on Nov 03, 2009 at 9:18 PM

#1 of 2 2000 Grand Marquis lurching when shifting from 3rd to 4th gear by hjf05a Oct 25, 2009 (8:04 pm)
When my OD is on my CW lurches heavily and won't/has trouble shifting into 4th when I hit around 35mph. I have to manually work the gas to get it to upshift. I'm also getting a squeaking/creaking noise while driving. This all goes away when I disable my OD. I already checked my transmission fluid and it's fine. Replies to this message: jsylvester (Nov 03, 2009 9:18 pm)
#2 of 2 Re: 2000 Grand Marquis lurching when shifting from 3rd to 4th gear [hjf05a] by jsylvester Nov 03, 2009 (9:18 pm)
Replying to: hjf05a (Oct 25, 2009 8:04 pm) Change the transmission fluid with Mercon V, and make sure they drain the torque converter as well - the 2000 still has a drain plug. I have my shop drop the pan and change the transmission filter every 60,000 miles as well. Mercon V fluid is backward compatible, and your symptons suggest old fluid could be the cause.