Outer Limits 4x4 Board

booked my sierra in for rwc n rego next week and theres a bad shudder under heavy acceleration 1st is worst, 2nd still bad but as i pick up speed it tones down....its still there but just not as bad as take off...???

just vibrates crazy??? its got a brand new steering damper as the old one was rusted through and shit itself bad!!! had the vibrations/shudder before i changed the damper and still has it now with the new one in??

wheel alignment/balance?

wats your thoughts? did a search that came up with 10million different topics...


cheers

if the "shudder" is at the same speed as the wheels are going and you feel it through the steering, search for "Death wobble"

If it's fast and you don't feel it though the steering, you have a flogged out uni, probably on the jackshaft, because that's where nobody looks.

Steve.

check engine and g/box / transfer mounts, wheel bearings, tie rods/ steering components, uni joints

thanks steve and mr rocky will do!! cheers

had it once before turned out to be a bent rear diff housing my moron previous owner who did not tell me

check axle seals for oil leaks im guessing

also check its not in 4x4 and front and rear shafts.

its hard coz so many possibilities.
be sure to say what it was so if it happens to anyone else here they know where to look first. G.L.

mud in the rims, busted gbox/engine mount, spring wrap if you're running long leaves or SPOA, egged tyre...

Check the axles U-bolts are tight.

excessive play in the tailshaft slip joint, that is the cause of vibration in mine.

My money is on engine, gearbox or transfer mounts.

Engine\tcase\gearbox mount or uni joint between the gearbox to tacse intermediate shaft.

Would be checking the mounts first.

Possibly (but unlikey) bent tcase mounts putting rear driveshaft out of phase.
Also check for missing bolts holding the shafts in place .. amazing how big of a vibration that can cause.

Or even king pin bearings that was my death wobble.

had a quick look under the sierra and found a broken gearbox mount rubber...it's still holding but the rubber is torn and damaged - the mount straight under the gearbox.

other mounts are fine no noticable damage anyway..will have to order a new mount on monday so i will update as soon as possible if the wobbles go awya after replacing the mount

Check the jackshaft unis while you are under there. the shuddering you are feeling is actually the jackshaft unis coming out of phase because the gearbox is moving more than it should.

Jackshaft uni failure will ruin your day- they normally go at the gearbox end and they normally take out the yoke when they go.

Remember, they are going very quick - at least 1.4 times quicker than the rear driveshaft- and they are on a very short driveshaft. they need to be in top condition.

Steve.

normally this on its own wont cause a bad vibration, like steve said check the uni's particulary the ones on the jackshaft