Vibration after installing leveling kit.

[sledbc]

Last fall I turned the keys up 6 turns on my 2007.5 Crewcab Longbox 3500 just to level it out, it didnt affect the ride quality much at all so I figgured i could go a bit more. Just bought and had installed at the dealership a leveling/lift kit with torsion keys, shock extentions and rear blocks and u-boltsfrom grandwest (i think its TrailMaster brand). The mechanic took out the 6 turns I had in and installed the new keys with the same # of turns as factory as suggested in the install instructions. Front end is an inch or 2 lower than the rear which is perfect for me since I load the truck up often. Picked it up tonight and over 100km/hr there is a vibration and its worse when 4wd is engaged. Will the cognito upper a-arms fix this? Or is something else wrong? Also....the rear shocks weren't long enough with just the 2.5" blocks which is strange because my 2 friends with the same kit with 2500's didn't have this problem, i bought longer ranchos to fix this. Stock the 3/4 and 1 ton both seemed the same height, i figgured they would have the same shocks, all are Z71 packages.

Any help/suggestions are appreciated.

[More Power]

Have you had the front-end re-aligned since the mods?

If not, my guess is you'll find that there's more toe-in now than it should have.

Jim

[sledbc]

Have you had the front-end re-aligned since the mods?

If not, my guess is you'll find that there's more toe-in now than it should have.

Jim

I had the kit installed at my dealer, they did an alignment, not sure what specs they used, should there be different specs with the kit vs stock?

[AKMark]

Check with the kit manufacturer. Every lifted vehicle I'd had (I've had seven) required different numbers when accomplishing an alignment than it did stock. Especially IFS fronts like yours and my current vehicle.

Drove me nuts with my Jeeps as I didn't realize how different it was, and every time I took them in, I had death wobble so bad I couldn't drive above 30 unless I floored it to 50. Learned after a time or two to take the numbers to them and when it wobbled on test drive, punch them for not using my numbers. I had arguments with many alignment specialists, some think then know everything. One guy wanted me to spend over $800 in new suspension parts, most of which were less than a month old, but in his mind they weren't compatible with my vehicle.

If you can, find a shop that specializes in lifted vehicles, like a "4 Wheel Parts" store or similar. They usually do a decent job.