Okay, here is my situation.
I have a Coast alum drive shaft. I have a vibe around 80 mph.
I sent it back for a rebuild and they sold me a new driveshaft which I installed, and I still have the same vibration.
I called them today and they said that the Pinion angle has to be ZERO. They do not recommend any angle other than zero. (pinion and tail shaft angle the same or parallel) I told them about the video and that a couple degrees was considered a given and they were addamate that it had to be Zero. So WTH?
My current DS angle is 2* (trans down .5* and Pinion down 1.5*)
I have all tube/billet arms and poly bushings except the rear end housing upper bushing which is stock.
So....WTH?
On the S197....the most common pinion
flange angle setting will/should be ZERO.
The problem with this whole deal is, 80% of people think "pinion angle" means...the actual pinion FLANGE angle..
The other 20% of the gearheads out there, think of pinion angle as the actual difference in angles.
Kind of like, when I talk to Flaming River about steering shafts, parts etc...and ask them about a "bumpsteer kit" - they respond with "I don't know what those are, but we have tie rod ends"
roflmao
So anyways...here is the deal.
Spicer, which makes most of the joints in these pieces, will typically recommend 1 degree of working angle on their joints.
They DO NOT want to see ZERO degrees of working angle on the joints.
Working angle is the angle of the DS in relation to the trans....which is your front working angle, and the angle of the DS in relation to the pinion flange...which is the rear working angle.
Those two angles should be equal/opposite under load.
Typical S197 Engines go "down" about 2-3 degrees or so.
If you set the pinion FLANGE angle at zero......then it will likely rotate up and be close to parallel to the trans/engine angle....and that means the joint working angles on each end of the DS will cancel each other out.