I have a '97 Ford Ranger keyfob (TRW-3165189, FCC ID gq43vt4t, DOC 1470 k763, transmitter 2) that I'd like to reprogram to use on my '99 Olds Silhouette. Can this be done--crossing brands--or do I need to buy a blank off of ebay? The Olds keyfob says: (GM 10245953, Canada 218 101 487, FCC ab00204t). Thank you, in advance....

They are different. You need to either go to GM for a blank or get one off EBAY. The codes on the back of the key fob need to match. There are also specific instructions on how to reprogram them. Each model/year could be different. Make sure you get the one for your van.

Good Luck