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I should've mentioned that there's a post on that thread almost all the way down by "wholesale_transmission" that reads:
"This is a VERY common problem with the GM 4l60-E transmission. This is 9 times out 10 a VALVE BODY PROBLEM not a transmission problem. You need to pull the TCC regulator valve from the valve body & install a sonnax TCC regulator valve kit. DO NOT LET SOMEONE SELL YOU A TRANSMISSION UNTIL THIS UPDATE IS DONE FIRST!!!!!! This will more than likely take care of your problem. Also the reaso you get a hard 1-2 shift is when the P1870 code sets the computer commands max line pressure. I have had a transmission shop for over 20 years & have only seen maybe 1 or 2 times the valve body update not take care of this problem.
Hope this helps you all out."
The above quote is what got me really thinking about it....I was determined not to get hosed...especially after I got the 1st two quotes. I am by no means a transmission expert, but hopefully this can help you out a little. Good luck with everything, and I hope it's nothing more serious.
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