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Re: trans fluid change
If this is your first service on the transmission, I don't think I'd flush it without dropping the pan, changing the filter too.
You've almost waited too long for a flush, you have the possibility of sending gunk through your transmission and killing it.
The fluid in these tranny's should be changed every 15-20k for a partial fluid swap and every 25-30k (at most) for a flush - otherwise, they are known for going to an early grave.
At this point, I would personally do a partial fluid swap, change the internal filter, and clean the pan, then in a few thousand miles, do a flush if you like. But, you do need to get all of that old fluid out within the next 10k or so, or you won't likely see 100k on that tranny.
Do not go to Jiffy Lube, they are notorious for underfilling these tranny's and they will burn up. The 4L30-E GM transmission is a delicate one, you'd be better off going to your dealer, even though they do charge more. Unless you can do this yourself, be cautious and ask around as to who's familiar with this tranny - it's not an easy one to refill and many places underfill them.
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