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R 380 Gearbox Whine

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2006 Defender with 80k on and done no work,  Its developed a transmission bearing type noise thats been getting progressively worse and I'm struggling to pinpoint it. Seams to be coming from the front of the gearbox area.

Only evident in 4 and 5th gear above 60kms, and gets progressively louder as speed increases.  Gear changes all seam fine and engage as expected. Swapped out the old oil for Mtf still no change.

Noise is still there even when I press in the clutch, its not spigot bearing or bush as I know how that goes.

Tonight I removed front prop and took it for a spin ...up to 60kms you could just about hear the whine but barely ... but still there. Could it be front diff and sound travelling up the prop ?

Am I right in assuming that the noise is still there in 4th that its unlikely to be a gearbox issue ?? I hope its not the gearbox as that will cost £££ to sort.

Nigel

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may well be one of the 2 rear support bearings in the 5th speed housing,

these are a common failure on the R380 which is why we do an upgrade by fitting bigger bearings,

 

Dave

 

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Thank you for taking the time to reply Dave,

Is it much of a job to replace the rear 5th gear support bearings or am I looking at a complete rebuild or new recon box !!

Nigel

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Hi,

it's not too bad, the hardest bit is removing the rear mainshaft collar, then the rear housing can be removed and you can then get to the bearings,

You will find a PDF of the R380 manual online :

Manual here

I would ensure you only use bearings marked 'RHP' or our 'NKE' ones, there are 3 other brands, all of which are rubbish, will fail in 3-4 months

Dave

 

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