Hi Everyone,

I’ve noticed that upon getting my 1999 Land Rover Discovery SD (series I) up to about 75 mph there is a intermittent low, vibration sound that comes and goes, but does so rhythmically with about 2 seconds of silence between each vibrational noise. This noise becomes louder and worse if i increase my speed to 80mph. The vibration is notheavy through the steering wheel and is felt most prominently through the accelerator pedal. This vibration does not occur below 70 mph.

- occurs regardless of whether or not I’m turning or driving straight
- occurs regardless of whether or not I’m accelerating or coasting
- Turning on the AC does not change the noise at all

 

Possibly wheels need to balanced.
Is your truck lifted? Could be an alignment issue with the front toe.
Vibration can also come from the transfer case.

 

The "2 seconds between beats" description is a real head scratcher. At 70 MPH you'd travel about 205 ft in between "beats". Wheels, gears, et al would have rotated several times in that span.

 

The truck has not been lifted. I got the vehicle a month ago and the front tires are not in great shape so it could be that they need to be balanced, but I’m hesitant to believe the issue is that simple.

I agree, the fact that it’s intermittent is kind of throwing me for a loop, but the pattern is very consistent at any given speed and the time between vibrations increases equally with increases in speed from 75 mph.

 

I’ve never driven mine over 70mph. They aren’t made for speed. Tires, alignment, balance all should be checked. These trucks are over 20 years old and are in need of new bushings, etc etc.

 

I’m definitely not trying to push it or anything, just trying to get it operating comfortably at high way speeds. The front end was recently re-done.

 

If the front tires aren't good, then that's where to start.
Worn out tires most definately vibrate and make noise.

 

The rhythm/beat of the vibrations SLOWS as the speed of the truck increases?

 

No, sorry, the vibrations become longer with smaller gaps of silence

 

If the tires are in bad shape you could either replace them with what you want or, replace them with the cheapest tires you can find that will fit and of course have them balanced and the front end aligned.