Welding a Diff on a VE is a very very bad idea !
The reasons why this is bad is,
1) Traction Control uses the each ABS brake channel individually to brake, driving wheels depending on the situation.
(Ie traction control works by reducing engine torque, AND by applying a brake force to the wheel that is spinning !!!!)
Weld a diff, and when traction control detects loss of traction, something here will need to give, engine, transmission, drive shafts, welded diff, take your pick, but one thing will be for certain, the results wont be pretty, for the driver, the car, and your wallet...
2) Stability management does this as well to on each wheel to induce understeer and oversteer (applying brake force to front or rear wheels to induce understeer or oversteer, and this is done individually as well),
Weld you diff, and you will find Stability management will do some very unpredictable things in the wet, and in extreme driving.
3) The above modules have sensors that detect brake force, individual wheel speed, and a whole lot of parameters that try to determine if the system is faulty. Weld a diff and sooner or later you are going to have DTCs pop up, and the modules will be disabled until the errors are corrected. In extreme cases, the ECM can reduce engine power if the logged DTCs are bad enough to warrant this...
Definitely buy an LSD diff from eBay. I got mine for around $300 bucks (2.90 ratio, the same ratio that I have n the car from stock).
That way you know it will work, the above modules will be happy, and if you crash the car, insurance will not have ANY reason to void your policy.
