Well Roy, I finally disconnected the hydraulic lines going to the tilt cylinder, capped & plugged the ends and started the machine up & raised the bucket in the air...and the bucket held its position. I raised the lift arm to put the bucket about 3' off the ground & let go of the controls, let it sit for a good 30-60 seconds and the bucket did not limp down. So I guess that means the cylinder is good, any idea what else it could be? Again, I already changed the relief valve at the hydraulic bank under the cab & unless I changed the wrong valve, that didn't fix the problem. Thanks again for your help so far.