Bachmann Life Like replacement gears
This isn't new news, and the link is going to expire, but I will post another because these guys never run out of gears and they aren't the only sellers.
Here is a link from Feb 17:
Here's the news you guys really want:
Bachmann and Life Like old gears that are broken or cracked are NOT unique or special in any way. The sizes are standard and the holes are also standard. The photo about shows a selection of replacement gears that can be used to repair those 1970's and 1980's locomotives.
I've found that using the thickest gear possible provides the best results. Sometimes you need to use 2 gears together to get the right combination.