^YES!!
preloading the axles, Ive seen 600whp builds on stock axles when they snapped their racing DSS ones but still wanted to go through the rest of race night.
All axles have "play" for the joints.
When you preload, you prevent that "SLAP" of the play hitting the parts of the axles together
This preload ALSO saves wear and tear on your differential
Use the e=brake if you wanna get a feel for it. of course, when its loaded, you will feel the car pull slightly.
Can use the e=brake and drag the car to the starting line if you wanna keep that preload