Hard shifts...bouncing speedo...cruise disengaging - Ford Powerstroke Diesel Forum
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Old 03-12-2012, 11:39 AM
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Hard shifts...bouncing speedo...cruise disengaging

Hey all, just pulled truck out to try and get road worthy. Had IDM failure last year and drove in a limp mode about ten miles. Replaced IDM and motor runs fine but tranny is kicking hard on up/down shifts, I mean neck snapping hard! Replaced VSS cause speedo was bouncing above 70, Ford genuine and now speedo is worse and my cruise wont stay engaged above 50 mph. Bounce is about 15 mph at fwy speeds. Pulled rear cover to inspect gear and found 2 slightly damaged teeth about 180 apart on gear. Tranny is also into O/D by 40 mph unless I run truck WOT through the gears, @ WOT tranny shifts smoother also. Dealer had me bypass connector and solder on VSS pins and still same issue. I'm lost, no codes, no O/D light flashing. Don't know anything about trucks history other than the odometer is not correct, people sold it to me were crooked. Any ideas would help. Thanks
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Old 04-01-2012, 04:42 PM
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mine does the same thing. did you have a tranny put in? i did. only had the truck 2 months so i do not know if it was doing it prior purchasing it.
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Old 04-01-2012, 04:51 PM
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yep.

Bought my truck with a new ford tranny. shifts way early into overdrive unless its floored. so i replaced the vss. and installed 4.11 gears. still have the same porblems. speedo also shakes since i installed the gears also i reprogrammed the speedo. ive been looking for help for months
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Old 04-01-2012, 05:20 PM
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Put in a used cluster...speedo is better but still bouncing...still shifting hard!...off to tranny shop I guess???
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Old 04-01-2012, 05:30 PM
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post up in the OBS flame free zone or OBS chat
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Old 04-01-2012, 05:57 PM
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You didn't have anything filled out on your signature so not sure what you are running or if OBS trucks are different, but I havea friend with a SD that had a TruSpeed calibrator go bad on them and cause similar problems. Removed that and the speedo quit bouncing and transmission worked like it was supposed to. He ended up recalibrating the PCM for the speedo after that and tossing the truspeed in the trash.
-Aaron
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Old 04-02-2012, 09:10 AM
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Mine shifts into O/D by 46 mph...diesel chugs along but same thing unless I'm at WOT...doesnt seem right???

'96 PSD crew long
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Old 04-02-2012, 03:26 PM
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For what it is worth, my SD locks the converter at 40 and goes into OD at 45, but does go into OD at higher RPMs with more throttle pressure.
-Aaron
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Old 04-03-2012, 04:35 AM
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Replace your speedometer (PSOM), they tend to get flaky as they get older, and depending on how rough of a ride they have had, the worse they are.
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Old 04-03-2012, 07:29 AM
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Just put one in...seems better but still jumping a little...going to try another sensor in diff....problem with original speedo got worse after replacing sensor with OE ford part
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