A few Qs that I need input on ASAP

Hey guys, I installed my SYE and now I have vibes when the Jeep gets past 45 mph. When the front DS isnt on there are no vibes. The front DS is good{u joints, balanced etc} Any ideas?

Secondly about a week ago my Speedometer started acting up and now it wont go past 50ish on the gauge, any ideas?


Im much more concerned about the first one. Thanks guys!

92 XJ 4.0
4 1/2 Rustys Lift
4.56s
Locked F&R

Sounds like the U joints in the front axle shafts, if they are REALLY bad you can tell pretty easily by looking at them. If they are just starting to go bad, then I would suggest pulling the axles to find out for sure. Good time to upgrade anyway???

Did this only start after the SYE, or did you only notice it then because the rear vibes went away?