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hdgene, ASE Certified Technician
Category: Transmissions
Satisfied Customers: 5495
Experience:  25 Years Automotive experience,ASE Master & L1 certified. Ford certified trans rebuilder
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2007 Explorer V6 with a 5R55S? transmission. Just had a

Customer Question

Hi. 2007 Explorer V6 with a 5R55S? transmission. Just had a tuneup. 99,000 miles. Car sometimes jerks while cruising mostly around 45mph, but also slightly noticeable at 70 mph and 35 mph. At 45, the rpms also moving up and down when it jerks as though slipping in and out of gears or hunting between gears. Also jerks sometimes just before stopping. AmsOil tranny fluid has 50k on it. I saw a wrench light about6 weeks ago at highway speed but it lasted for only a couple hours and didn't come back.
Submitted: 1 year ago.
Category: Transmissions
Expert:  hdgene replied 1 year ago.

Ok it sounds like a possible torque convertor shudder with that many miles on it which could be the source of both concerns as the TCC comes on around 45 mph and fully locks at that speed. it is also referred to as driving over a washboard road or rumble strips. The Torque convertor clutch is part of the torque convertor so check the fluid level and condition, even amsoil breaks down over time. regular service intervals are 30k miles. So you should verify first what codes might be stored with a scan tool even if the warning lights are off, once a lamp comes on it stores a memory code. if the codes are trans convertor related you can try flushing the trans first. If after a few hundred miles the shudder returns the torque convertor would need replacement. Also checking mode6 data shows engine misfires that do not set trouble codes. Both a misfire and convertor shudder feel similiar. if any other trans codes are stored like a 2nd gear ratio code for instance it would indicate a different concern/repair.