RenegadeMatt,
I installed the Frankenlift II Premium at 65k miles in December of 08. Two weekends ago I noticed that I had grease around both my wheel wells. The passenger side inner CV boot was broken in half, on the drivers side I couldnt really tell where the break was in the boot was but it was coming from the inner CV. I took it to the offroad shop and they replaced the boots and told me that the drivers side outter CV housing had stress cracks in it. I have posted on the board and had a few suggest if I was purchasing new axle assemblies to go with NAPA. I now seem to be experiencing CV joints thumping when the suspension droops (extends).
See post:
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?t=40161
I am currently working with AllJ to get through this problem and they are responsive and supportive. I am not pointing fingers and saying that the Frankenlift is a bad product but I was in the same boat that you were in. I did research and wanted to get a great quality lift that I could rely on. All signs pointed to the Frankenlift and I pulled the trigger. It was installed in my wife's daily driver and couldnt really be without this vehicle. It was installed by myself and my mechanic friend who has been in the business for at least 20 years. There are things that I am learning from Quinn at the moment that I wish I would have known during the install.
The theory about my CV boots are that it might have been pinched during the install (which we were very careful about) or they were hard and cracked due to the new angle. There really isnt an explanation about the cracks in the CV housing but it could have been their prior to the lift but I am not sure. If I would have known the possible issue with the boots I would have just put new boots on the car while doing the lift. Its your call on whether you want to do that or not. Quinn is suggesting that I do an alignment in my drive way to see if that helps the CVs from thumping while going down the road. It appears that the bottom of my tires need to come out 1/4" and my toe is a bit too much. The back of the tires are out further then the front (dont remember the measurement at this point it was late last night). I am on the fence if a new UCA would help my application or not.
Also didnt know this at the time but you shouldnt tighten your clevis bolts while the car is in the air. You should put jack stands under the LCAs and allow the car to rest on the suspension and then tighten so you dont introduce any artificial lift.
Another thing I recommend is set your front end on jack stands (placed by the LBJ) to allow the car to sit on the suspension while the tires are free to spin. Spin the tires while straight and turned to verify that the CVs are not binding. (something else I didnt do during the install)
Again I want to stress that I am not talking bad about the Frankenlift or the support from Quinn and Heather at AllJ. I just wanted to share my experience with the lift. Lots of people on the board have installed their lifts and had great success but there has been a small few that have had issues with CV's and such. I hope that I will soon be one of those people that have great stories about their lift. If all these things dont work AllJ is talking about providing me strut assemblies that are about .5 or 1" shorter to reduce the angle of the axle assemblies. As soon as we identify a solution I am definitely going to post it.