Charles , It needs to end up with 2degrees of driveline angle, How low does this car sit? The best way to do this is put the car up on jack stands (with the stands under the diff, and the frt control arms ), to put the weight onto the suspension. what ever the driveshaft angles at coming out of the trans, thats the angle you need for it to be at the differential.You need to do what ever will make this happen!!! Get it to be a couple of degrees at each end .Thats how Ive done it and it works great!!!If you dont want to do it take it to someone else . Good luck, David.