Measured driveline angles, please help me troubleshoot

I bought myself an angle finder and decided to troubleshoot my 0-25mph takeoff vibes.

Transfer case: 2 degrees
Front shaft: 8.5 degrees
Rear shaft: 6.5 degrees
Axle: 5.5 degrees

Where am I screwed up and how to I fix it? Currently I have a carrier bearing drop of 5/16" installed, and the driveshaft middle sits on the low side of the bearing, not firmly centered.

Just off hand I'm thinking I need to remove the bearing drop and shim the axle ~2 degrees or so.

 

Measurements without bearing drop:
Front shaft: 7.75 degrees
Rear shaft: 6.75 degrees

 

After flipping carrier bearing:
Front: 4.5 degrees
Rear: 9 degrees

Takeoff shudder same if not worse. Thinking axle wrap now, or worn out carrier bearing.

 

Solution done. 1-piece driveshaft with standard U-joints at both ends. Removed 3 degree shims which caused h50MPH+ vibration. $400 out the door from a local shop. Nicely built and lighter than the original shaft.

Result: 0-5mph shudder under heavy acceleration from a stop from axle wrap. Otherwise flawless.

To completely kill vibrations I may upgrade to some form of trac bar.

 

you posted and solved your own problem.

bravo.

 

Well, I didn't get much feedback here. I researched all I could on the forums, consulted a friend who is a drive-train specialist, troubleshot it myself, and posted my results so hopefully others can learn from my experiences.

 

Subbed. I am installing Icons & Dakars soon so, better to keep myself as informed as possible. Thanks

 

One peice with a double cardian was my solution... some 5 years ago.

 

I have a very slight take off shudder under moderate to heavy throttle to 5mph, but it's good enough. The angles between the pinion and transfer case are ~.5 degrees.

Trac bars would totally kill the vibes, and I'd do that if I decide to supercharge in the future.

 

Too few of use feel qualified to make commits on driveline angles. Do you have bigger tires?

 

One size up from stock, 31.5" diameter.

 

Subbed.