You know,I've got the same problem after my rebuild? <img src="/forums/images/graemlins/rolleyes.gif" alt="" />At about 60km/hr It sound like a bearing going, or knocking from fuel.
I've got about 12000km on my rebuild & I also let the machine shop where I had it done listen ,but i didn't know at the time when it actually did it(the knocking that is), not at 40km/hr anyway <img src="/forums/images/graemlins/rolleyes.gif" alt="" />

"YOU CAN ONLY LEARN SO MUCH KNOWLEDGE IN A LIFETIME..BUT IMAGINATION IS WHAT MAKES THE WORLD GO AROUND"
89 POWER RAM D50 4X4 XCab 2.6L
91 Grand Prix GTP 3.4L
87 Jeep YJ Laredo 4.0L EFI