The BioRID II, 50th percentile Hybrid III and RID2 crash test dummies, all representing a mid-size adult male, were subjected to HyGE rear impact sled tests. Their measured and calculated responses were used to evaluate their sensitivity to sled velocity, head restraint position, and other test setup parameters. Three test series were conducted using different sled acceleration pulses and different types of seats. For conditions where three identical tests were conducted, repeatability was evaluated. In Series A, the effect of sled velocity on the Hybrid III and RID2 was evaluated. For the RID2, the effect of the initial backset was also evaluated in this series. In Series B, the head restraint position and the sled velocity were changed to see how the performances of the BioRID II, Hybrid III and RID2 were affected. In Series C, the effect of sled velocity changes and head restraint position on the Hybrid III and RID2 were again evaluated, and repeatability was assessed. Comments on the handling and durability of the dummies are also provided.