I have a 94 with the 3.4 and am wondering why today I was able to leave rubber from both tires and start to get sideways with a little sand on the road but usually it only spins 1 tire and goes straight?

 

Open diff will spin both tires as long as the traction is even on both tires. If one tire is in sand and the other is not then the one in the sand will spin. On a nice level clean road both tires could spin.

 

Ok thanks, what would be the easiest way to lock it with out welding it?

 

Get a better differential. If u don't want to weld but still want the same effect u can get a spool. Which is just one solid piece in place of the dif

 

Thanks, I will look into that.

 

You don't weld rears on street cars. The easiest thing to do is find someone parting out a V8 and buy the whole rear. Just do a little research get one with the same gears and the same tracktion control system and its a direct bolt in. You will also get the disk brake upgrade if you buy the whole rear.

 

powertax makes a locker "lockrite" it takes the place of the side gears and spider gears it stil lets the diff work when turning corners but put 100% of the power to both wheels under Acceleration better than a spool in that sense

 

you could look around for a z28 rearend. not easy to find around here but is a easy switch.

 

A powertrax, or similar locker as mentioned would be the easiest way. And since you don't disrupt the ring & pinion gears, there's no setup (gear mesh, bearing lash, etc) that needs to be done like if you were to replace the carrier with a posi unit (or a spool). You also do not want to use a spool, it's not for the street because it locks the axles together the same as the "redneck" way of welding the gears. The tires need to spin at different speeds when going through a turn, and without a diff, you could end up breaking something you don't want to.
EDIT: do you really feel your 3.4 needs an LSD, and is worth the expense and time to change it? I used to have a 94 with the 3.4, with good sized tires, and I had to do a brake stand to get it to do a one-wheel-peel.

 

It will spin the tire just fine with out flooring it. Do I need limited slip? No but I would like to beable to get a little sideways when i want to.