New lift and front end. Vibrations????

[dirtmissle]

First off, thanks for the wealth of info on this site. I put all new ball joints, tie rod ends, sway bar bushings, and bearings into my 88 K5. I then installed a skyjacker 4in spring lift. Before I did all this and when I first bought the truck there was a low grinding noise I could feel at about 45mph that shook the truck to the pedals. After the front end and lift the grinding went away but I had rear end vibration from the unaligned ujoints. After much reading I installed a 1" t-case drop kit from skyjacker. This made the ujoint noise in the rear go away but made the grinding much worse. So much that I feel it when cranking and idling the truck. My next step is to go to a cv rear ujoints and uninstall the 1" spacer on the t-case. Anybody have any other suggestions. My 700r4 shifts fine and I haven't found anything vibrating against the firewall. Thanks in advance for any help. Missile

 

[K85 Octane]

post this question in the Garage forum, you should get a little more help
unfortunately this forum doesn't get much action, even from the members

If the vibration is felt during idling, or not moving, then it's definitely not something in the driveline. When exactly does the vibrations occur?

 

[cacman25]

Try replacing your motor mounts. It helped in mine! Good Luck!

 

[JPOutfitters]

we had to gently bend my exhaust crossover pipe with my lift as the front driveshaft would rub a little.........but mostly just rubbed at full drop. Also look at shims for the rear to adjust the angle of your rear diff also. I did a 4" lift with rear blocks and they were angled to rotate the rear diff up towards the tcase as well as the relocation utilizing the spacers for the tcase. I've had no vibration whatsoever......but I've seen guys that had to get custom shims with a spring lift to adjust for that the same.