Shuddering on down change, could be related to clunk

Gannon · Post by **Gannon** » Thu May 29, 2008 8:14 pm

I have noticed that on changing down gears, as im letting out the clutch, the car shudders. Most noticeable on 3rd to 2nd. Only happens when revs arent matched during down-change. ie 2000rpm in 3rd causes revs to increase to 3000rpm in 2nd.

I have also noticed i have a "clunk' just before i drive off.

If i put the handbrake on and try to move forward, i can make it 'clunk', then i can get it to do it again if i try to reverse with the brake on.

It is really hard to diagnose by myself as i cant be under the car while im testing it.

Any suggestions?

Thanks in advance

Post by **Alex** » Thu May 29, 2008 8:25 pm

warped flywheel perhaps.

with the clunk, im sure youve checked the castle nuts etc? Also make sure all the control arm/radius rod bolts are tight, particullary where the radius rod goes back into that plate with three bolts.

shagged bushes at the top of the radius rod? Shagged bush in the rear diff? Is the clunk there all the time; ie, does it go away if you engage 4wd and so on?

engine mounts, gearbox mounts. Engine stay rod?

theres afew ideas there, although im sure youve checked most of them.

alex

Matatak · Post by **Matatak** » Thu May 29, 2008 8:34 pm

shuddering on downchange may more likely be the Thrust/Release bearing on the clutch.

Clunk = Check bolts everywhere around where tourque goes.
all hub bolts, castle nuts, Radius rod and plate etc etc.

YouTube · Post by **El_Freddo** » Thu May 29, 2008 10:58 pm

The clunk would be CV's. My cv's have been on the way out for the best part of two years now. Its always clunked in the way you've described.

The shuddering is the flywheel, most likely warped a little bit, nothing really to worry about unless you don't like it (I always double the clutch and match revs, the shudder is my reminder when I don't do it

)

Cheers

Bennie

Gannon · Post by **Gannon** » Fri May 30, 2008 4:04 pm

Ok thanks guys

The CV's are less than a year old from REPCO! (they are supposed to have a 2 year warranty) I got them to pass rego last august.

I thought the shuddering could be warped flywheel, but i doesnt shudder when im accelerating and slipping the clutch purposely.

I had a bit of a look and checked the tightness of a few bolts around the crossmember/ engine mounts, suspension etc. during the week.

I'll have to go visit dad and see if he can help me diagnose the faults.

Thanks

YouTube · Post by **El_Freddo** » Sat May 31, 2008 11:57 pm

Suparoo wrote: I thought the shuddering could be warped flywheel, but i doesnt shudder when im accelerating and slipping the clutch purposely.

I think you'll find if you have the rev's high enough you won't feel the shuddering, if you drop the revs the shuddering will be there. Have a play at low speed - moving off from a standing start at low revs then high revs.

Cheers

Bennie