have just got my car back with new TC fitted and all is well ,very happy except when I do about 70mph on the motorway and let my foot off the gas there is a slight vibration and a droning sound on the overrun which lasts to about 40 then goes. On A roads all is well and it does not do it at all as I don't go above 50. Has anybody any Ideas ?
28th Jul 2015 10:10 am
haroosh
Member Since: 16 Nov 2010
Location: Perth & Kinross
Posts: 624
Hi sounds awful like the front diff. The main symptom is droning on the overrun. When mine went it the noise could be turned on and off with acceleration and deceleration. I am currently dealing with another droning noise but it's steady and speed related so praying its just a wheel bearing. Maybe worth going to your local Indy to get their take?
Hi Haroosh yes exactly what mine is doing especially the turn on and off with accelerater. I have just had TC done. What next Thanks for your help
28th Jul 2015 1:40 pm
RBP
Member Since: 29 Aug 2012
Location: N Yorks
Posts: 1936
Hi Mark.
Had a slightly noisey rear diff recently. Changed the diff oils & added Lucas oil additive. 1000 miles later & no noise.
Worth a try especially if your diff oils haven't been changed before
Hi Richard, yes its booked in next week for all oils changing and filters apart from obviously gearbox ! That problem is cured now thank god. It seems as I said when we met she has looked after every thing except gearbox and diff oils, maybe she was never told to. I fear that the front diff is past oil as it is quite a noise and vibration when letting off the gas at 70. I also notice it now when driving slower speeds aswell. I looked in service history and found a receipt for two front wheel bearings dated 11/3/15 so maybe she had noticed it too
28th Jul 2015 3:21 pm
haroosh
Member Since: 16 Nov 2010
Location: Perth & Kinross
Posts: 624
Member Since: 01 Dec 2012
Location: Stockport
Posts: 271
There's an easy way to find out where it's coming from. Get a £10 10 metre 3.5mm lapel microphone from eBay or elsewhere, and plug it into your iPhone etc. then get an old battery jumper clamp & tape microphone to it. This will allow you to drive around with the microphone clamped into various components.
I did this & it worked a treat. Located my noise down to my rear diff in a few minutes. The noise from the diff was horrendous compared to other components.
There's a wireless version of this for professional garage technicians for a few hundred quid. Same principle.
Good luck
28th Jul 2015 8:10 pm
tayaste
Member Since: 15 May 2013
Location: Chester
Posts: 7633
Member Since: 10 Aug 2015
Location: Warrington
Posts: 16
I have also just used the Lucas heady duty oil stabilizer and my front diff sounds much better, it was whining away like a good 'un. Not sure how long it will last but worth a shot before shelling out for a new diff or having to remove to do the output shaft bearings.
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