I am having rattle issues with the LS3 powered TA I have built. I am currently running 301 TA non-AC springs with one loop snipped off. Stock on rates these are 329 lbs/in., I estimate I am at 380 lbs/in after snipping a coil. Ride height is perfect. This is way too much for a mill that weighs 440 pounds vs close to 575 for a 301 and trunk mounted battery, lightweight starter, etc... My axle weight with 200 pound driver and full fuel is 1920 front, 1660 rear. What I am looking for is actual weights of the front axles and which motors, trans and options to build a database so I can build a spring that is suited for daily driving with an LS mill. Any real (not guess's or internet figures) are welcome.