Silverchado

Ok guys I am fresh to the truck scene and I am trying to learn all I can. I want to do a 2 4 hotchkis drop on my truck to decrease the body roll a tad but I keep bumping into post that talk about shiming the pinion and or the carrier bearing.
Will someone who really knows what they are talking about explain the science of these actions??
How much of a drop to you have to do before this becomes necessary?
How is this action performed and what purpose does it serve?

I want my truck done right. I am trying to retain as much of the factory feel as I can without sacrificing performance to do so. I sure don't want any rear end problems or shimmys and shakes in the drivetrain. God knows a cam is in the future and that will give me all the shimmy I care to have.

Silverchado

PS I already have belltech 2" drop shackles and that alone didn't seem to affect anything in a bad way. Would 2 more inches really make a difference??

mjgjr72

are you talking about shims for the rear diff housing that go between housing perches and springs to correct the pinion angle. if angle is off in will put more stress on u joints

Silverchado

Ehh thats just it I have no visual picture of what I am talking about. I really don't know

mjgjr72

well most suspension drops or lifts if well built incorparate correction for pinion angle into the kit, usually in the blocks used between the springs and axle housing mounts or provide camber bolts for when control arms are used, but i could be totaly wrong, two links below might help a little.

pinion angle
http://www.baselinesuspensions.com/info/pinionangle.htm

shim used to change angle
http://www.vibratesoftware.com/html_...e_changing.htm

Silverchado

Great yea that shed a little light on the matter.