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camelman

Member Since: 27 Feb 2013
Location: Peak District
Posts: 3409

Constant hum from 50mph upwards

Right then, TD5 (130) with standard gearing and no lift.

when speed approaches 50mph get a very loud hum starting, appearing to come from the front of the vehicle. Gets louder up to 60, below 45mph all is normal.

Taking the vehicle out of gear and coasting downhill has no effect so it is directly related to roadspeed and not changing under load.

Anyone else had this before I start swapping front axle bits out?

27th Jun 2025 10:42pm

landy andy

Member Since: 15 Feb 2009
Location: Ware, Herts
Posts: 5971

2006 Defender 110 Td5 USW Zermatt Silver

Wheel bearing??

Any noise change with steering inputs?

28th Jun 2025 5:14am

BrickBox

Member Since: 05 Oct 2021
Location: Wales
Posts: 1003

2008 Defender 110 Puma 2.4 USW Zermatt Silver

Tyres,wheel bearing, binding brake? 2008 2.4 110 Utility Station Wagon XS.

28th Jun 2025 6:31am

revd

Member Since: 20 Apr 2024
Location: England
Posts: 269

Tyres? Significant damage to tread or sidewall even if holding pressure

Drain the front differential and strain the oil that comes out

28th Jun 2025 8:04am

bear100

Member Since: 22 Mar 2010
Location: South Wales
Posts: 2021

2010 Defender 110 Puma 2.4 USW Santorini Black

The tread noise if big treads or bearing would be my guess

Jack up and give them a spin 2023 Defender L663 V8
2016 Range Rover Autobiography 4.4 TDV8 (gone)
2010 110 XS Utility 2.4TDCI
2010 Range Rover Sport TDV8 (gone)
2007 Discovery HSE TDV6 (gone)
1993 110 csw 200 tdi (gone)
1994 90 HT 300 tdi (gone)
1994 discovery 300tdi (gone)
90 hybrid 3.5 v8 (gone)
Range rover bobtail 3.5 v8 (gone)

28th Jun 2025 8:06am

4RF RDS

Member Since: 19 Jul 2015
Location: Ottawa
Posts: 975

2000 Defender 110 Td5 XS CSW Epsom Green

Change diff fluid (in my experience it is the most likely culprit). If no change in hum, check front wheel bearings.

Good luck 2010 Range Rover MkIII Autobiography Super Charged (Idris)
2003 Range Rover Mk III (Desmond FitzWilliam)
2000 Defender 110 CSW TD5 (CTX)
1992 Range Rover Classic (Lizzy)
1972 Series III 300 Tdi (Stanwood)
1967 MGB GT

Every normal man must be tempted at times to spit on his hands, hoist the black flag, and begin to slit throats.
H. L. Mencken (1880 - 1956)

2nd Jul 2025 7:56pm

MarkBrown

Member Since: 03 Oct 2022
Location: Mid Wales
Posts: 546

1983 Defender 110 Other HT Auto Keswick Green

Tyres starting to wear unevenly would be my first guess. Try swapping front to back. 1983 110 automatic OM606

3rd Jul 2025 6:08am

Shroppy

Member Since: 25 Feb 2016
Location: Shropshire
Posts: 878

1986 Defender 130 V8 Petrol HCPU Aintree Green

Bizarrely I had this yesterday on my D2 (also TD5). I had put it down to the recently fitted roof rack but found that it goes away over 60mph. No discernable vibration through the steering wheel. Will investigate later and report back in case it helps diagnose yours. 1985 127 V8 Build Thread
Series 2 109"
Series 1 80"

3rd Jul 2025 11:14am

camelman

Member Since: 27 Feb 2013
Location: Peak District
Posts: 3409

After changing the n/s front wheel bearings (where it appeared the noise was coming from), there was no change. I then swapped the o/s as I was on a roll and the problem has gone!

8th Jul 2025 2:01pm

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