The right wheel is usually the spinner, due to torque re-action the right wheel gets a little lighter...
I think the TruTrac is worth it...I'm guessing the install to be around 300-500 scheckles...
I paid 400 for install, amny report getting it put in for 300. TT cost 520-600 with bearings. YES, it is worth having this upgrade! Safety in snow, for us 2 wheelers, and overall driving. A most practical performance upgrade. Really more important than the CAI or CatBacks that we all seem to jump on first...
Both rear wheels get equal power. With the open differential you have, when one wheel starts to slip, (and you don't have ABLS) all the power then goes to the spinning wheel. I'd go with the tru trac if I had a 2WD.