I have a 6 inch lift on my truck. To gain the lift in the rear I went with blocks obviously b/c they were cheaper than leaf packs. the block I got from superlift were not wedge shaped like the factory block and when I called them up they said that flat like I had was better than wedge shaped. I just got one bigger block I believe 5" so I could replace my factory block and not have to stack them. Is this goin to cause me trouble with my drive shaft angles and wear my pinion in the long run?