So I got my new pr44 front and trail 60 with pr60 housing in rear installed about a week ago. Love them so far. My front I have adjustable upper and lowers so was easy setting everything up. My rear I am still running stock control arms. The pinion angle is def too high in the rear. It's within dynatrac specs since u can go to 18 deg but it's def not sitting ideally. I want to lower the pinion angle so the shaft is straight to pinion. Since I need to tilt it down I need either longer lowers or shorter uppers. I don't think they make shorter uppers so I'm thinking I need to get adjustable lowers. There are many of you folks on here running pr60s in the rear.
Maybe I missed something but, if you've lifted your Jeep, how is it that you have your pinion too high? Are you're saying that it's actually pointing upward? If so, how is that possible?
Do you run adjustable uppers or lowers if only one?
If anything, I have and would recommend installing adjustable uppers as they are typically what are needed to set your pinion angle but, if you really do have your pinion up too high, many of the control arms out there will NOT allow you to set them shorter than stock.
Def run longer lowers. Give you a small wheelbase bump also.
Personally, I would disagree. While installing adjustable lowers can be helpful to help re-center your axle under the wheel well at ride height, that typically only requires about a 1/4" adjustment over stock when lifted 3"-4". Purposefully extending them to increase your wheel base isn't a good idea especially if you're still running standard coils. The push back will cause them to bow significantly and cause issues with them rubbing against your track bar and really, for no real benefit.
Somebody can correct me here, but I think you want the pinion couple degrees lower than the DS .
On a JK, this is not correct. You want your pinion to be inline with the drive shaft. If there is enough slop in your control arm bushings to allow for your pinion angle to change enough to cause vibrations, a slight correction of maybe a degree is what you'd want but really, that's just to address your sloppy control arms.