I read somewhere that if you dont hook up the VSS the car might die out and cause all sorts of problems, is that true or will the speedo just not work?

 

I dont know about other trannies but in my 01 Z28 (has a 4L60E) my vss went out, the speedo did not work and it would not auto shift at all I could shift 1st to 2nd manually when i moved the shifter to D or OD it just reved. do know if that helps but hope that does

 

I'd like to know as well.

 

my 4l60e feel on its face the first few times i hammered it with no vss working. I thought it was going to cutoff

 

If your computer is not seeing the vss signal you will have trans issues. It needs to be fixed asap or you will be looking for a new trans.