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Originally Posted by E's c10swbfleet
why cant u do a 1 1/4 notch on the frame rather then the front x member. it seems like it would work   just move the upper a arm up and some new holes drilled. i am just looking for other options i dont know if i have the right tools to do the x member in a timely manner.
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Upper and lower need to move as a set or you completely whack the suspension geometry. Moving both control arms up is exactly what the xmember notch does. However, if you don't section the middle of the xmember when you do this, you will either push your engine up (which mucks with clearance and drivetrain alignment) or you have to mod the motor mount towers (which then gets you oil pan clearance issues). Doing the xmember section keeps suspension geometry intact and avoids all the engine issues.