What makes the whine noise?

[ecohen2]

My Grenadier drivetrain makes a loud whine noise when I am cruising along at a constant speed. If it is not under load the noise stops... I think they all do this, I am curious is it the differentials, drive shafts or the transmission that I hear making the noise?

Being the engineering geek that I am, I want to try to reduce the noise..

 

[Lars]

Mine whines like crazy at about 2000RPM. @pmatusov reported a dramatic decrease in general noise after some sound deadening mat was applied.

https://www.theineosforum.com/threa...your-grenadier-today.12411127/post-1333344707

 

[Clark Kent]

https://www.nhtsa.gov/?nhtsaId=11022191

Assuming your vehicle is assessed as within the range of normal, if you find the whine offensive you could add more sound deadening material inside the cabin.

 

[Shopkeep]

My Grenadier drivetrain makes a loud whine noise when I am cruising along at a constant speed. If it is not under load the noise stops... I think they all do this, I am curious is it the differentials, drive shafts or the transmission that I hear making the noise?

Being the engineering geek that I am, I want to try to reduce the noise..

I get whine from my front diff under power which peaks at 92kph/57mph, improved with diff oil change at last service but still there. Loan Grenadiers I have driven are don't have this whine. Will be escalating the issue at my next service, the dealer requires a sound recording to submit to Ineos for evaluation.

 

[Krabby]

Isn’t part of the reason is the transfer box gear driven?

 

[Clark Kent]

Isn’t part of the reason is the transfer box gear driven?

Well if you say anything on here enough times it becomes a fact
But yes, straight gear transfer cases tend to be louder than chain drive.

Ineos think it more an undocumented and no extra cost feature of the axle design. See the dealer bulletin attached to my post above.

 

[pmatusov]

Mine whines like crazy at about 2000RPM. @pmatusov reported a dramatic decrease in general noise after some sound deadening mat was applied.

https://www.theineosforum.com/threa...your-grenadier-today.12411127/post-1333344707

Larry, count on a couple of boxes of 4-mm stuff and some acoustic foam. But it does get quieter.

 

[sayntzero]

I get whine from my front diff under power which peaks at 92kph/57mph, improved with diff oil change at last service but still there. Loan Grenadiers I have driven are don't have this whine. Will be escalating the issue at my next service, the dealer requires a sound recording to submit to Ineos for evaluation.

Ha. I got the exact same thing. Exactly at 57mph I got a peak resonant whine. I just learned to live with it.

Then My front drive shaft failed and was replaced. Now I get the same whine exactly at 68mph.

Service center says it's my roof rack, even though it comes from under the floor in the front.

The loaners I have had do not make the sound at all.

 

[OkGo]

Watch out for axle and drive line issue... Dealer dismissed my complaint as, it is what it is, till the car shat out a lump of oil.

 

[Eric]

I can't here the transmission whine, it is drowned out by the constant whine coming from the front passenger seat

 

[sayntzero]

Watch out for axle and drive line issue... Dealer dismissed my complaint as, it is what it is, till the car shat out a lump of oil.

I can't say what I'll hear next. Haven't had my truck for a few weeks. Rear main seal is leaking so they are replacing multiple items in the drivetrain. Spent some time at a Toyota dealer today. I am getting worn out.

 

[agcheck]

Grenadier is the only vehicle on sale with a fully gear driven transfer case, and unless if you have owned a LR Discovery 2 or earlier LR product, probably the only gear driven transfer case vehicle you've ever driven. They make some noise - it is normal.

 

[NQ94]

Grenadier is the only vehicle on sale with a fully gear driven transfer case, and unless if you have owned a LR Discovery 2 or earlier LR product, probably the only gear driven transfer case vehicle you've ever driven. They make some noise - it is normal.

LC 70 is a fully gear driven t/case and without much sound deadening a new 70 sounds exactly the same as a 20 year old one with 300000km on it.

 

[agcheck]

You are right - as we don't get the LC70 here in North America I didn't think to include it. That too has a gear driven transfer case.

 

[Tom109]

Larry, count on a couple of boxes of 4-mm stuff and some acoustic foam. But it does get quieter.

I did the whole cargo area up to the battery box under the rear seat, with the same stuff you posted. Zero change in noise level

 

[Skydance]

There should be no whine noise to be honest. Just some faint humming. I have no modifications or sound deadening and it’s a 23 model.

I would check if the transfer Bowden cable isn’t rubbing against the propshaft and try go in 4 low to see if it’s loosens up some tension in the box.

 

[pmatusov]

I did the whole cargo area up to the battery box under the rear seat, with the same stuff you posted. Zero change in noise level

Hmmm
The loaner 2025 truck I had last Thursday was so much louder than mine. All sounds - tire slap on pavement joints, engine drone, gear whine, wind noise.
I thought I got used to it - till I got my truck back in the evening and it seemed almost as quiet (or as loud) as my wife's LR4.
My wife's always skeptical about my vehicle "upgrades," but she absolutely agreed with this change. It is now possible to carry out conversation in sotto voce.

Did you also do the rear quarters? I did the left (last remaining) last Saturday, and added some corrugated foam in the voids. Did also the rear doors - empty steel boxes do transmit fair amount of sound, even when they don't contribute to it.

As a side benefit - the acoustic insulation may also serve as a bit of thermal insulation. Cold or hot camping in the Grenadier may be more pleasant - will know soon.