so i just installed a 2/4 drop on my 07 ccsb 2wd sierra and everything went together easy as can be. took it for a test drive and have noticed a very slight vibration every so often when i am at a cruising speed and have to apply throttle to maintain speed. it does have its more noticable moments when pulling a hill but each out take has only lasted maybe 3 secs at the most. any ideas on what i should do?

 

 

check your pinion angle

 

we was thinking it might be that, but do they make shims for my body style. all i was seeing is the ones for the classic body

 

yep, pinion angle. a shim is a shim is a shim...

check out suspension source

 

measure the width of your leaf springs and choose your shim

 

ok last question i see 1 to 4 degree angles about how much do you guys think i need. like i said before is almost not even noticable but every once in awhile.

 

Once I get my lowering parts thrown on mine (hopefully it warms up enough to do it soon) I'm going to shoot for 3-4 degrees on mine. David Wolfe says to shoot for that with these kinds of non solid mounted setups so that's where I'll start.

 

Just buy a cheap angle finder and see what the difference is between the pinion and the drive shaft. There like $5 at Harbor Freight. Angle Finder w/ Dial Gauge

That's the only way to truly know what you need.

 

exactly this.
buying a shim and hoping for the best is a terrible idea but remember you dont want the angle to be the same as the driveshaft either