Ok guys, im a complete moron when it comes to this stuff so any help would be appreciated. Below is a crude MSpaint drawing of my measurements. All measurements where taken with the rear wheels on ramps and the front jacked up so the framerails where completely level. The trans points down 3* and the pinion points up 11*. Obviously the pinion needs to come down alot, but exactly how much?

 

i think i've heard -2* for the rearend. don't know the rest.

 

OK... I read this twice, and am assuming your truck is lowered to the point that you can't crawl under to measure. Plus the pic in your sig lead me to believe so.

Measure using an angle finder (magnetic) on the slip yoke, then on the pinion yoke. I was always told that those should be within 3 degrees as a best practice. Mine differs by 1 degree (4 on trans & 5 on pinion). If you did just that, I'd assume you're inquiring due to driveline vibration.

 

i'm running -5 on mine, works bad ***

 

Trans to rear +-3

 

Its only at a 3/4 drop now so i can get underneath it. The first measurements i took in the air just for ease, but the rear suspension WAS loaded. And i am using a magnetic angle finder.

I crawled under with it on the ground too and got the same measurements at the pinion and DS, i didn't bother checking the trans angle again.

I do have a bit of vibration, but im more worried about snapping a u-joint on launch.

 

Sounds like you're on the right track. Without seeing the truck, it seems you have two choices: A) Shim the tail of the trans to raise it in order to raise the angle to compensate for the rear angle, -OR- B) Readjust the rear to decrease that angle by 8*.

I'm no pro at drivelines, so someone may chime in to comment on my thought. If you're not comfortable (like me) with adjusting the rear axle, take it so a reputable driveline shop to check it out. Do your research on the shop though b/c not every shop is as good as you may think, or is as good b/c of someone's recommendation. I know this first hand.

I'd be worried about that rear u-joint too. Dunno what kind of angle shift one could expect under WOT launch.

 

I can't shim the trans up much because there is a crossmember that is very close to the DS and it hits if i move the trans more than about 1/8". From what i've found in my research so far i would need to move the pinion down about 12* actually which nobody makes shims that big and i don't want to stack them. I suppose i could have them custom made.

From looking at it it seems if i put stock hangars back on it would bring the pinion back down alot, and i've been thinking a bit more rake to the stance might be nice so i'm debating doing that and then i might only need 4 or 6* shims.

 

are you sure its up 11* what is the angle finder being placed on? your trans does not move, its set perfect 3* down, now for the rear you want it to be point up between 2-3* the rest of the angles throughout can not be controlled.

 

That's why I put this in a previous post.