need new trucks for tender

Hello I have a old Rivarossi 2-8-8-2 it has the motor in the cab. The loco runs fine. But the tender keeps derailing in 2 spots I spent all weekend on this and it still derails. It’s the rear truck that gives me the most trouble. I changed out the wheels didn’t work add more wight to the tender. No help. Check the track not it. The only thing I can come up with is the trucks my be wrapped? It looks like the front side of the truck rides higher then the rest. Can I get new trucks for this? Thanks Frank

IIRC, the Y6b uses “Buckeye” 6 wheel trucks on the tender. Try Precision Scale, they should have them.

Yup. Part number is 32346. They retail for $19.75

Andre