Question about SOA

[redrock]

I am going to start SOA soon and i was wondering, when your lineing up the pinnon with the transfercase how do you know what degree your the right angle. i am not doing the SYE yet and i planned on lowering the tranfercase. i understand most of it just not that part.


Thanks

 

[Caleb]

it depends on what type of driveline you will be using, I am not positive on which is which but with a CV (whihc you wont have) or just a simple two u-joint kind, one of them you just point the pinion at the output and the other you just make the pinion parallel to the output...best thing to do is to add the t-case drop then set it up...

 

[Hickey]

with a CV you point the pinion at the t-case.

Basically, in a d-line, a u-joint that is operating at an angle has two caps accellerating while the other two are decelerating. This causes vibration. If you have two joints in a d-shaft, and they are both at equal angles, they will cancel each other's accel/decel and cancel the vibration. In a CV shaft, you have 3 joints. The cv cancels it's own vibes(cause it hase two joints) so you don't want any angle on the single loan joint.

 

[redrock]

it depends on what type of driveline you will be using, I am not positive on which is which but with a CV (whihc you wont have) or just a simple two u-joint kind, one of them you just point the pinion at the output and the other you just make the pinion parallel to the output...best thing to do is to add the t-case drop then set it up...

Yeah i am just using the two u-joints for now. So basically what your saying is you make it look like it does stock. i see what your saying. Yeah i understood the Cv set up pretty good.

 

[redrock]

Is thier anyone who has a picture of thier jeep with a SOA and t-case drop i could look at everything i found on line do the SYE for their tech write up. but i found some pretty write ups.

 

[Caleb]

with a CV you point the pinion at the t-case.

Basically, in a d-line, a u-joint that is operating at an angle has two caps accellerating while the other two are decelerating. This causes vibration. If you have two joints in a d-shaft, and they are both at equal angles, they will cancel each other's accel/decel and cancel the vibration. In a CV shaft, you have 3 joints. The cv cancels it's own vibes(cause it hase two joints) so you don't want any angle on the single loan joint.

I have never heard it explained that way and it makes total sense...now I know

 

[wrangler]

Get an angle finder and set your axel at about 8 degress up i set mine about 15 and its alittle to much. i had to make my driveline alittle longer i got ti done at six states now it works great

 

[bobdog]

Get an angle finder and set your axel at about 8 degress up i set mine about 15 and its alittle to much. i had to make my driveline alittle longer i got ti done at six states now it works great

With all due respect you can not just tell some one to set their pinion at 8 degrees. Every rig is diferent. He needs to match the operating angle of the joint at the transfer case as closely as possibile if he is not using a CV shaft.

 

[Caleb]

With all due respect you can not just tell some one to set their pinion at 8 degrees. Every rig is diferent. He needs to match the operating angle of the joint at the transfer case as closely as possibile if he is not using a CV shaft.

thank you, I was trying to bite my tongue on that one...

 

[wrangler]

it worked for me so its just my two cents

 

[EZRhino]

You may as well plan now on getting a CV style driveline. My Scrambler is a crap load longer than a wranger and I still had a bit of a vibe with a two joint driveline. Also.....when you are figuring the angle witha C V, it is good to have the pinon angle a degree or two down at rest. That way when your rear axle is under load whilst driving the torque will raise it and it will be at zero.


EZ

 

[Hickey]

it worked for me so its just my two cents

And you have the same tranny as Redrock?

 

[sukaB]

With all due respect you can not just tell some one to set their pinion at 8 degrees. Every rig is diferent. He needs to match the operating angle of the joint at the transfer case as closely as possibile if he is not using a CV shaft.

Amen,
Just put it in cause till you have a band aid bar you'll just bust that d-line anywho

 

[JeeperG]

Another thing that may help is getting some 1" raised motor mounts that will tilt everything slightly. Also if you do get it not perfect there is always Shims I have very large shims that I got from Tom Wood.

That slip yoke will not last long. You will toss that in a hurry. I had to make a very quick stop at a light once and just from the front of the jeep going down and the back up pulled the Slip yoke completely out. Nothing like a driveshaft beating around underneath.

JeeperG