Front end drop, finally figured out the problem

My 2003 pete. 379 had a level look all around.
Took it into peterbilt in Springville Utah.(Cory)
To figure why it felt like somthing was twisting around the trans.area when taking off loaded.
Anyhow, They replaced the springs with one block backwards and when I PU truck it pulled to the left somthing awefull.
Well I wanted an alignment anyway.
When I got to allinment ( JACKS TIRE AND OIL awesome place. ) they found the left block backwards, a shock asorber bolt only half way..
TURNED OUT TO BE ENGINE MOUNT.
Now my level low truck is 3 to 4 inches higher.
In that, could it be a stronger spring or extra shims in mounting blocks.
That's all.