As the title says, I recently got a new chain to replace the old one but left the cassette. Whenever I shift under load, or sometimes even on a hard start, the chain will either "crunch" or jump between gears rather than go to the gear that I want. I'm assuming (probably correctly) that it is the cassette, but I was hoping to check with good 'ol BF to see if it's some other problem I'm overlooking instead.
The chain runs fine when kept in the same gear, so it's not a stiff link or anything like that. I did use the old SRAM powerlink, so that may have a different pitch. However, my chain problems don't seem location specific.