I've changed cars but are reusing my same trans & engine combo. I'm even using the same gear ratio, but altho the new car is faster, my 60's are slower. The old car was a backhalved Dart with a ladder bar, the new car is a tube chassis with 4 link & its 400lb lighter. The old car had a 9", the new a Dana 60. I used to run 1.28 60's quite regularly but the new car so far has only pulled 1.32, im thinking the rear springs are too stiff @ 130lbs, any chassis tuners got some ideas i can try?