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Old 12-11-2012, 07:39 AM   #115
cg22
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Join Date: Sep 2009
Location: Tampa, Florida
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Smile Re: 4T65E Trans Shift Hard, P1811 DTC

I wanted to give back to this community and share another possible solution that solved my hard upshifts and whining 4T65E tranny (1999 Regal GS).

My alternator was acting up (flickering lights), had a new battery installed recently too. After reading this article (and being a electrical engineer) I decided to replace the alternator and disconnect the battery cable for a few hours. Well, it did the trick, no more hard upshifing and tranny whine disappeared. I am sure a tranny shop would have soaked me for a rebuild ($2000-3000). Nothing else was done to the tranny.

It is due for a service soon and I plan on using the Seafoam Transtune and Dextron VI in the near future.

Again, thank you all for your detailed posts and input on this subject!!!!

Regards,

cg22
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