Polyurethane bushes for diff. mount

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Polyurethane bushes for diff. mount

Postby Timothy North » Mon Jun 24, 2019 10:14

Hi. Has anyone any experience of replacing the differential mountings with polyurethane ones. I ask because I need to replace mine and the £471 cost of a replacement mounting (the lower one) is too much and justifies looking for an alternative.
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Re: Polyurethane bushes for diff. mount

Postby Ian Linden » Mon Jun 24, 2019 23:19

I've not had to do this, but I understand there are mounting bush specialists who stock every known size. If you go to a non-franchised garage, who normally gets parts from non-car-manufacturer sources, they should be able to identify the size and press them in for you.
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Re: Polyurethane bushes for diff. mount

Postby George Mercer » Sun Jul 14, 2019 19:24

Hi,

I have replaced my diff bushes with polly bushes that I found on Ebay for £100 but I have only just passed the MOT so haven't driven it more than a few miles to find out if they work. That was back in May. I don't see them anymore on Ebay but here is the seller

https://rover.ebay.com/rover/0/e11401.m ... Tags=bu=bu

Monster Sport Japan are advertising them for £140 and they have a UK office but I haven't tried them.

https://www.monster-sport.com/e/car/cap.html
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Re: Polyurethane bushes for diff. mount

Postby Stuart Paterson » Thu Aug 22, 2019 13:31

I'm a similar position - I had a diff bush fail during a grass autotest last month. Monster sport quoted me £150 for the bushings + £75 postagage + taxes - They apparently only maintain their Japanese webiste now and sell directly via email and bank transfer or through Rakuten.
That felt a bit steep for me though so I've dived into the process of trying to make my own bushings. I'm planning to machine a polyurethane bush with a delrin sleeve to prevent squeaking.
The old bushes are out and I'm just waiting for the plastic to arrive. If you're still looking for a replacement bush I can keep you updated on how difficult this process turns out to be..
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Re: Polyurethane bushes for diff. mount

Postby George Mercer » Sat Sep 07, 2019 19:05

Update on poly bush diff mount. I completed a couple of hundred miles on the poly diff mounts but there has been a constant drone/buzzing noise/vibration from the rear end on trailing throttle. I wasn't sure it was the diff mounts, as I replaced them with poly bushes before I even drove the car, so I had no reference point as too whether the noise was there before. In the meantime, a diff mount with what looked like reasonable bushes came up on Ebay for a good price. The mount needed cleaning up but the bushes weren't too bad. I thought it was worth a try as it's only a half hour to change it. What a transformation :D . The noise/vibration has gone. The slight knocking when going on/off throttle quickly has also gone. The car feels so refined, the whole powertrain is smooth and quiet. I think a set of the Monster Sport parts will be money well spent. Perhaps a few people who would like them ( myself included ) could get together and pay for one set of postage only. My conclusion is that poly bushes might get the car back on the road but the refinement will be missing, though softer poly bushes may work better than mine.
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