Nolathane Diff Bush Noise Resonating Through Rear End.

[mick1378]

Funny that when they first installed the bushes that night took it home straight back next day an they had used the original bolt in rear diff bush and this had pushed it forward as it was longer than needed the nolathane people apparently told them that so they had to cut down the bolt to suit. So this was taking up all the free play between gear box and diff. Diff, gear box with tailshaft sandwiched in the middle.

I'm thinking the issue is with the diff as the clunkyness feels a bit excessive especially with the new bushes and maybe the fact that they are a harder that the old worn bushes didn't transfer any of the harsh noise. I think I will go via diff specialist get them to have a look.

[mick1378]

Just an update so far

I took the car down to pedders to have a look at it for me. And basically they tell me as far as they are concerned all is ok which is great news, so the resonating noise seams to be simply that. They did say they never heard it that bad but a least I have a in biased opinion on the noise that im hearing and it seams as though all is good in regards to the bushes etc. I did try and record it but the iPhone won't pick up the low frequency. (I dont like to give people stick if its undeserved that's why I was here before going back to Midas to give it to them) so I have ordered some sound deadening material online and I hope that this will void all resonating noise from rear end. (Or at least I hope so cause it will dead set annoy the living f¥#k out of me and I will burn the car lol)

Anyhow thank for the post/ replies much appreciated.

[ramp rate]

went down the nolethane path noise was over the top plus kept snapping diff bolt,went back to ford rubber bushes for the 3 diff mounts and havent had an issue since

[demon1300]

went down the nolethane path noise was over the top plus kept snapping diff bolt,went back to ford rubber bushes for the 3 diff mounts and havent had an issue since

Were all 3 of your bushes nolathane? If I'm not mistaken, this usually occurs because people only change the rear bush and the front 2 can't cope with the torque loading on the diff and transfer it all to the much stronger and rigid rear bush.

To the OP, I've got much of the same problem with mine at the moment. Went with CAT600 bushes and there's some serious knocking going on in the rear end. I don't fully blame the bushes, more so the turkeys at ford who installed them...

Its noticeably worse when warm (indicating diff). I get the same harmonics it sounds like you're getting at a particular part of the rev range and what sounds like constant knocking even under light load. It gets really bad when clutching, again most likely pointing to diff. I've not got it on a hoist yet but want to very soon. Sounds like the rear end is destroying itself!

I've filmed the rear nolathane bush with the gopro to see if its moving (which it wasn't), I'll post the footage up on the weekend. I might try and do some in car filming of the noises also for you to compare.

Edited 31/07/14 10:59 AM by demon1300

[ramp rate]

yeah all of my rear assembly was nolethane,changed center and two outer diff bushes back to factory spec ford rubber problem solved,no harmonics or clunks been that way for 6 months now not an issue since

[XRSEXT]

going back for warranty centre diff bush next week and to be honest from all the research and comments online of before and after results with genuine/aftermarket diff bushes, from what ive read genuine is best..

Edited 12/08/14 10:26 PM by XRSEXT

[.Stripes.]

Genuine is best if you want quiet and like dropping the cradle to replace them every few thousand kms...

[arronm]

I reckon I could kill a stock rear bush in 30 mins.

[turbotrana]

Aaronm, what type of bushes did Nizpro use in your sons BF? How is the Nvh in that?

[demon1300]

Aaronm, what type of bushes did Nizpro use in your sons BF? How is the Nvh in that?

I know they recommend the superpro comforts. Before I did the CAT600's I rang and spoke with Dave and that's what he said they fit. He commented that he personally wouldn't put the superpro solids in if it was his car...