My truck right now has a 6" rear drop with no shims but it has a terrible vibration, I am pretty sure it needs shims. Does anyone know which degree of shims I need? Also I plan to drop the back 2 more inches in the back

 

You should measure the angle's and see what the difference is.

 

I would get the adjustable flip kit from djm makes this shimming thing much easier. But don't have an answer to ur question tho lol..

 

You've got to measure all the driveline angles and see what's going on first.

Also, which brand flip kit are you using? The Belltech one I have has the proper angle for the rear end built into the kit. JDM's is adjustable but I've read it's very poor quality.

 

As mentioned, you MUST measure to know what shims you need.

 

DJM flip kit =

 

two piece or one piece drive shaft?

 

Never had an issue with my djm.. I guess everyone has different experiences

 

It's a mcgaughys flip kit with 1pc drive line. So measure the trans, drive line, and pinion angle with a magnetic angle finder?

 

Bump I really need help with this. my pinion angle is at like 13 and my drive line angle is at about 3