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960 Transmission upshifts too soon. 900 1994

posted by  someone claiming to be Olivier on  Fri Sep 16 15:14 CST 2005 [RELATED]

My 960 transmission seems to upshift too soon after I've driven it uphill for a while.
After it's shifted too soon, it also won't downshift when it normally would, letting the engine rpm drop well below 1000rpm and clearly struggling, and I have to floor the accel pedal to force a downshift.
When it's misbehaving, it will also occasionally hesitate between two states rapidly before it settle on the lower gear (engine rpm goes down-up-down by 1000rpm).
This also happens after a long freeway drive with AC on during a hot day. It will happen at ~25mph and ~45mph.

Trans and Engine codes are clear. PNP was replaced and trans flushed this year.

Could it be a converter lockup issue, or sensor issue? Any suggestions much appreciated!

(PS: I had a previous post on this but lost the tread, sorry, Newbie! Thx for all the help so far, this forum is great!)






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