Shift Points
#11
01-05-2011 | 09:50 PM
All Star
Joined: Jan 2009
Posts: 907
Likes: 2
From: Corrales, New Mecico
here's my opinion and i may have some of this backwards because i haven't thought about it in a long time but - based on the transmission flash (old vs new), the OD off setting can allow or disallow TCC lockup.
In my old stock flash, OD on sucked bad, doing TCC lock at about 35, then shifting to OD at about 42 mph. rpm's stay low and it was a pig. with OD off, it would still do TCC lock, but not the OD shift. it drove a little better.
then along comes superchips, which reprograms the trans. it might be the latest dodge transmission flash, maybe?, i'm not sure. i can't find a tsb on it.
with OD on, it locks TCC at 40ish, then shifts to OD at 55ish. very nice.
with OD off, it doesn't lock TCC nor shift to OD, so it tows much better.
In my old stock flash, OD on sucked bad, doing TCC lock at about 35, then shifting to OD at about 42 mph. rpm's stay low and it was a pig. with OD off, it would still do TCC lock, but not the OD shift. it drove a little better.
then along comes superchips, which reprograms the trans. it might be the latest dodge transmission flash, maybe?, i'm not sure. i can't find a tsb on it.
with OD on, it locks TCC at 40ish, then shifts to OD at 55ish. very nice.
with OD off, it doesn't lock TCC nor shift to OD, so it tows much better.
The transmission that drives me nuts, and is a true slush box is the 545RFE in my 4.7 Dakota 4x4...I'd do something to fix it, but it would FUBAR my warranty.
#12
01-05-2011 | 11:39 PM
Thread Starter
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Captain
Joined: Jul 2010
Posts: 609
Likes: 1
From: Grand Rapids, MI
So a couple of things to add. I read that tapping on the brakes should cause TCC unlock, not actually braking but simply activating the lights. The PCM should then unlock the TCC. Correct?
And... Running with O/D off at 55 I'm at 2200rpms. That sounds like 3.93s with my 285/75 R16s. Is that also correct?
And... Running with O/D off at 55 I'm at 2200rpms. That sounds like 3.93s with my 285/75 R16s. Is that also correct?
#14
01-06-2011 | 12:24 AM
Site Moderator
Joined: Jan 2008
Posts: 8,374
Likes: 24
From: Sioux Falls, SD
Quick note, didn't see it addressed yet: 4th gear is O/D. These transmissions only have 4 gears. What feels like an extra gear is the torque converter lockup/unlocking these guys are referring to, not an extra gear.
#15
01-06-2011 | 09:11 AM
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Captain
Joined: Jul 2010
Posts: 609
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From: Grand Rapids, MI