So i decided to have a play with it on the car. Marked the position of the castellated bearing adjusters,so i could go back to the original settings if needed,so after a little adjustment ,mainly to eliminate the play between the prop/pinion and the drive shafts.i took it for a blast and the difference is quite amazing,no drivetrain clunking on light throttle,the diff whine/noise is greatly reduced,and has me happier with the car( i think i may have just got lucky with the adjustment) ,so it stays for now,I will monitor it and see how it goes,but very happy,chalk and cheese ,could it get quieter as it beds in??