longer shackles/pinion angle

[bgcntry72]

I am finally getting around to removing the 1" block from my rear OME springs and going to a RE 1.25" shackle. I know, I know, but I already had em, and they were steel. Regardless, I currently have an SYE and a 4* shim in the rear. I am a little below my ideal pinion angle, and I want to know how much these shackles will affect that angle before I tear into the springs. I know experimentation is necessary, but if I can avoid it, I will. Should I take out the 4* shim when I take out the 1" block or should I leave it in? I guess my question is, will the 1.25" shackle have an effect of more than 2* on my pinion angle? Thanks for any light shed, as it will cut in half the number of times I have to drop the axle.
:dunno:

 

[Bender]

If you have a SYE I think I can safely assume you have no sort of t-case drop.

In that case I'd say with the 4* shim and your current shackles with block your pinion pobably sits somewhere about 3*-4* below the driveshaft angle. I'd say keep the shim and get rid of the block. The new shackle mount should make up a few degrees of that pinion angle and you'll be about 2* to 1* lower at the pinion compared to the driveshaft which is where you want to be.


Just so you know...
I'm running a SYE with my t-case pushed UP another 3/4" or so. I have about 6" lift in the back with my shackle mounts moved down and running about a 1.25" shackle lift as well. To keep my angles in check I needed a 5* shim. I'd say I needed a little more of an angled shim because my t-case is up a bit higher.

But the only true way to know is to put it in

Cheers!

 

[bgcntry72]

Good news

That is what I was thinking, and what I was hoping to hear. The figure of 3-4* below is right on the money, according to the angle finder I have. It is silent, until about 75 mph, and then it is light droning. I figured that the shackle and the 4* shim I had in there was the ticket, but I had to hear it from someone else. Thanks for the help, Bender.
BTW, the axle is an 8.25.