WOW! I wish the underside of my L looked that good... But I guess the underside of your L hasn't seen the sort of things mine hasnico leone wrote:
I was also thinking - if you have a frame to hold the rear diff in tight you'll find the drive train even more responsive! A mate of mine made one with some old L series swing arms (I believe) and a bash plate. The arms bolted to the bash plate, the bash plate bolted to the diff and the other end of the swing arms mounted to some tight rubbers mounded on the K frame beside the current swing arms, they were the old mounting points of the original donor K frame.
I hope that makes sense. He reckoned it eliminated all torque twist of the rear diff...
Cheers
Bennie