Well I pulled a trailer weighing 7655 pounds this evening in rush hour traffic and not a bit of trouble with the engine however Im wondering about this driveline grunt when starting out in 1st gear. It seems to happen around 15 MPH when my torque really picks up under boost and never makes a sound after that. Could this be axle wind-up and warping the bushings out slightly or does this sound more like the axle winding up with torque and pushing the center spline to the limits with alot of loading force behind it? This one has me puzzled. To describe the sound its like a low chattering sound much like a clutch would make with oil on it however its a slower pace. Typical timeframe is on the order of 1.5 to maybe 2.5 seconds throttle dependant, full boost (15 psi) and actually keeping up with traffic after a real easy start-off. 15 pounds you ask? Yes using a diffrent exhaust scroll with external wastegate and the blow-off set to 17 pounds, it can handle it just fine. Im just worried it might be something like the clutch slipping in the OD unit however I dont feel a shutter under acceleration, just the noise.

Any ideas thoughts or am I just loosin' it?

Thanks

Brandon-988