You should be able to do this with your iphone. Just put it up against the round hole next to your diff cover as shown below...
I've been playing around with this over the last couple of days, and with the help of a couple of PM's to and from Eddie (thanks heaps :thumb
, I think I may have got my castor angle into a better range.
I downloaded a couple of angle finding apps for the iPhone, and started checking what the alignment shop had set my castor at, and although my Jeep was driving well, the numbers I got were a little unusual and I think some of this was due to the app I was using (so downloaded a better one), and I also suspect that maybe the castor was set a little wrong at the shop.
I decided to shorten my front LCA a bit to try and get a better angle between the pinion and tailshaft. Before I did anything I marked the adjusters on the CA's just incase I had to return them to their original position if my adjustments made things worse. I tried shortening the arms by one complete turn on the Synergy double adjuster sleeve, then took it for a drive which didn't reveal any bad effects (maybe slightly better). I've now adjusted it a further turn and will take it for another test drive tomorrow.
I've ended up with an angle of 1.5° on the front diff pinion flange, and a reading of 4.5° on the top of the ball joint. Hope that sounds alright to you gurus.
With over 2500 kms (almost 1600 mile) to drive over the coming weeks, I'm hoping I've got it right, and the Jeep will steer well and have little or no driveline vibration. Time will tell.
If it hadn't been for this alignment write up by Eddie as well as the follow up help, I wouldn't have been game to touch this stuff, and would still be battling with driveline vibration. So thanks again.
