Mud-club

Vehicle & Technical => Defender => Topic started by: plugger on June 25, 2009, 13:34:17

Title: rear-end wobble
Post by: plugger on June 25, 2009, 13:34:17: Getting a serious vibration on the back end about 40 - 50 mph in top when under power. When I back off she runs smoothly, it's the same in every gear at about the same revs (Oh for a rev counter!) but only when the power is on.
Any ideas?
Title: Re: rear-end wobble
Post by: V8MoneyPit on June 25, 2009, 15:01:39: You're not getting strange squeeking noises at the same time as your rear end vibrates, are you? :shock: :lol: If so, I'd look at your joints..... UJ's.
Title: Re: rear-end wobble
Post by: plugger on June 25, 2009, 15:46:51: No, no squeaks, I did wonder if it could be U/Js but wouldn't they be a problem at all speeds?
Coming to a halt there is a slight knocking from the rear as well, feels as if something's trying to push from behind - weird sensation!
Title: Re: rear-end wobble
Post by: tack43 on June 25, 2009, 19:58:54: A frame ball joint?
Title: Re: rear-end wobble
Post by: Saffy on June 25, 2009, 22:50:26: Your going to have to jack it up and inspect for anything obvious with suspension, give each wheel a spin check for binding, bearing play, differential making nasty noises, check them UJ's they will drone, vibrate and bind, check transmission hand brake for binding.

betting on UJ's
Title: Re: rear-end wobble
Post by: Range Rover Blues on June 25, 2009, 23:54:42: Same vibration at about the same engine speed in any gear? that sounds like a misfire.

Of course the obvious is the propshaft/handbrake area and you must ensure these are sound before going any further.
Title: Re: rear-end wobble
Post by: kevinf on June 26, 2009, 14:36:04: A frame ball joint,worn half shaft drive flanges,worn or poor quality trailing arm bushes one of these or a comgbination of all of them?
Title: Re: rear-end wobble
Post by: plugger on June 26, 2009, 17:29:38: Quote from: Range Rover Blues on June 25, 2009, 23:54:42
Same vibration at about the same engine speed in any gear? that sounds like a misfire.

Of course the obvious is the propshaft/handbrake area and you must ensure these are sound before going any further.

Yes, I thought exactly the same but there's no vibration from the front or through the gearstick suggesting it's not misfiring, seems the prop/ uj's are the first things to investigate.
Thanks for the feedback
Title: Re: rear-end wobble
Post by: plugger on June 26, 2009, 17:31:27: Quote from: kevinf on June 26, 2009, 14:36:04
A frame ball joint,worn half shaft drive flanges,worn or poor quality trailing arm bushes one of these or a comgbination of all of them?

Thanks Kevin

Looks like a weekend covered in rust dust for me then!

Bob
Title: Re: rear-end wobble
Post by: sv130 on June 28, 2009, 09:20:34: "Coming to a halt there is a slight knocking from the rear as well, feels as if something's trying to push from behind - weird sensation!"

Just make a quick check that your center diff isnt locked in place mate, forget about the little light being off and jack the car up to do it.

Gaz
Title: Re: rear-end wobble
Post by: davidlandy on June 28, 2009, 11:28:34: mine did that and it was the A frame ball joint on the top of the axle worn out
Title: Re: rear-end wobble
Post by: extreme90 on July 01, 2009, 08:21:07: it'll be the a-frame ball joint as mentioned
a good way to test is have some one sat in the truck letting the clutch out a little in 1st low, with there foot on the brake.
you will see the nose of the diff pinion rise and fall which emitts the vibration due to a different prop angle.
the nock will be the ball joint moving around under load and going onto over run.