I had the same problem with my 37 and had it sitting 3" from ground. I made my own crossmember that was made wider than usual to protect my pan. Found every dip and the road and my crossmeber hit every time.. I had cut 2" from front coil springs so I put new coils on the front to raise it 2" and I also put spacers under my axle attached to leaf springs to bring the back up the same 2". Checked pion angle and everything was ok. Haven't had a problem since.