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Old 09-02-2011, 14:31   #1 (permalink)
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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?
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