dlougen

When I replaced the engine on my 1999 forester the torque converter was not fully seated and I think I may have damaged something .The aft becomes aeriated after a few minutes of driving.This causes problems with the viscous coupler.When I go around a corner there is a clunking from the rear end.If I put the fuse in to disable the awd the clunking disappears

I have a2000 legacy sedan with the ej251axawl sohc engine that junk .I also have a ej25dakdyl engine that is good .Can I swap them?