This is my post from another forum:
I think that shift valve is sticking in your case. Get out the owner's manual and use the correct procedure to check your tranny fluid. LubeGuard may help to loosen up that tranny shift valve. Fixing the tranny valve DIY may make sense for you = really not that hard to do.
Quote:
try buying a pint of "lube guard" for that tranny and see if the tranny solenoid (sometimes called tranny valve) starts to free up and shift better. That new tranny should still be under warranty.
Lube Guard or nothing at all.
Always take the tranny pan off when changing your tranny fluid, never go with tranny flushes. Clean all the mudd off the bottom of the tranny pan and put a new filter in also.
Look thru the owners manual for the correct procedure to check your tranny fluid height. Check this height yourself following the procedure and if adding Lube-Guard take a pint out before adding the Lube-Guard.
http://www.cadillacfaq.com/faq/tsb/d...07-30-013e.pdf read the prior TSB also.
Your cheapest fix is most likely the Lube Guard. If you haven't changed your tranny fluid yet -- Do it!!! --And then add the Lube Guard. Lube Guard will help unstick that valve.
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