Mopar A-Body Torsion Bar Size and Part Number Reference Torsion Bar Diameter Spring Rate Mopar Performance# OEM # Application
.810″ 90 lb/in p5249148 drag bars
.830″ 100 lb/in 2535888 2535889 slant six bars
.850″ 110 lb/in 2535890 2535891 slant six/318
.870″ 120 lb/in p5249149 2535892 2535893 318 w/air/340
.890″ 130 lb/in p5249150 2535894 2535895 383 standard
.920″ 150 lb/in p5249151 heavy duty handling
.990″ 200 lb/in p5249152 solo/road race
1.040″ 250 lb/in p5249153 heavy duty road race-oval track
1.090″ 300 lb/in p5249154 oval track 1/4 mi–opt.1/2 mi
1.140″ 300 lb/in p5249155 oval track 1/4 and 1/2 mil



.810. Use a good DA shock to control it.