5R55E harsh shifting, no flare, bump in R - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Ford Explorer | Ford Explorer Sport Trac | Mercury Mountaineer | Lincoln Aviator Forum for discussion of the Ford Explorer, Ford Explorer Sport Trac, Mercury Mountaineer and Lincoln Aviator.

LinkBack Thread Tools Display Modes
post #1 of 1 (permalink) Old 09-02-11, 02:31 PM Thread Starter
Registered User
Join Date: Sep 2011
Posts: 1
Read 5R55E harsh shifting, no flare, bump in R

I have a 2008 Ford Explorer V6 4.0L with 5R55S transmission. Vehicle is a middle east spec car, purchased in Dubai.

1) Most of the time shifts from 2nd to 3rd happen with a bump. I can't here any related noise, like clunk etc. Not sure if a flare is visible in the tachometer, but from what I can see and hear engine rpm does not increase, it falls during the shift without spiking.
2) If accelerating, let off the gas at around 2000-2200 rpm and start coasting, then transmission still does the upshift. Upshift usually happens when engine is at around 1600-1800rpm and falling. This happens with a slight bump in my back, not as hard as 2nd to 3rd shift, but still feel-able. This is true for both 2nd to 3rd and 3rd to 4th upshifts.
3) Engaging reverse from D happens with a very noticeable bump. I can hear the bump, but it is not a clunking sound (not hollow). Holding down the brake pedal more firmly makes the bump less noticeable, but it's still there. If engage the R from D right after the vehicle stops, then most of the time there is not bump, it goes smoothly.

I am not very hard on the gas pedal, shifts usually happen in the range of 2100-2300 rpm. If accelerate harder, then virtually all shifts are noticeable. It feels as if the transmission disengages the gear, car starts braking for a moment, then engages the next gear with a bump. I am not sure on the braking feeling, might be confusing sudden loss of the acceleration with braking, it might just be coasting at that moment.

Changed the oil and filter a month ago. Oil is Valvoline MaxLife ATF Multipurpose ATF (has Mercon V spec). Vehicle was refilled with engine on and transmission on P, cycled through other gears (D, 3,2,1, R; no actual wheel rotation). Old oil was in good condition. This issue was there before the oil change.

I have read about the flare issue and that most of the time this is solved by changing the solenoid block, or the EPC valve. But I am not seeing a flare in my case. Wonder if anybody could offer some advise on this?

tmarat is offline  
Sponsored Links

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Trucks | Utes | Vans |SUVs | Crossovers > Ford Explorer | Ford Explorer Sport Trac | Mercury Mountaineer | Lincoln Aviator

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome