Thanks for the advice. I did check the spring for cracks and don't see any. I’ll try some grease.
I tried to find some used motors in town but none of the junk yards had any – hard to believe with how prominent the Ford Taurus was. I was going to do the eBay thing but just ended up through going O'Reilly's Auto Parts because I was impatient and wanted to do the conversion this weekend.
As for the window going all the way down Panteraplace.com has a very detailed write up on modifying your original Pantera regulator so that this is possible. I have done what they recommended but must need to do a little more grinding in some areas to get the proper fit. Here is a link to the article: Windows that go all the way down.
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