First time here so hope I am getting through. Thanks again for the warm welcome at NJMP. That towing story is almost an exact copy of mine going to Watkins Glen with my SCCA FP Sunbeam years ago. Great fun at NJMP despite that strange noise on accelerating in right turns. A closer look shows that the rear universal joint bolts were trying to carve up the rear section of the transmission tunnel so am happy I stopped early before any real damage. Sorry I was slow with the new motor and noise. The Series 1 has a different set-up than 2 or 3 for rear axle (old Sprite design) lateral location. I had it set with insufficient right side clearance between the universal joint and trans tunnel with driver weight plus acceleration. Also, I had the coilover Spax shocks adjusted soft and as low as the spring mounts go. So I am changing things now.