Whining from drivetrain - front diff ?

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pete100

Joined
Jan 6, 2010
Threads
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Location
Norway
Something in my (1999 LC100 VX 4.2TDI IFS manual transmission) is whining on upon acceleration and over run (quiter under no load). I last changed the diff oil F&R ~3000km ago, and all look perfect. However on a hunch I drained the front diff, and the magnetic drain plug now resembles a christmas tree :-/ See attached image. I guess this is the cause of the whining, and the front diff is dead. Only 300,000 km on the clock, so I'm a bit surprised. Haven't done any off-roading in since last oil change, just snow/icy roads.


/Pete

diff-shaving-tree.webp
 
It doesn't take much to grenade the two pinion diff. In snow, a spinning front wheel that all of a sudden gets traction will do it.
 
I removed the front prop shaft, locked the centre diff, refilled the front diff oil, and went for a short test run. No whining :-)

So now I need to rebuild the front diff. But I looked through the procedure (link below) to isolate the diff from the road wheels too, until I get time. However what I don't understand here is that in the normal mode, the flange, snap ring and drive shaft all rotate together. So surely if the flange is removed then the drive shaft & snap ring will no long be held centred, and thus rub on the hub/housing (wearing very very quickly) ? And the same if I machine the spines out of a spare set of flanges and use them ?

http://tlcfaq.com/main/2012/06/front-drive-shaft-flange-removal-on-the-trail/

Sure I'm being stupid here, or ?

/Pete
 
If the front Drive shaft is removed as well as the flanges, then nothing is going to rotate except your wheel...
 
machined flanges...

See attached image from FSM. I guess this is from a rigid front axle, but it's the Toyota 100 series front hub locks. Instead of carrying around machined flanges, and the hassle of swapping them in situ upon a front drivetrain failure. Maybe it's possible to just grab a set of these parts, and mount them pre-emptively ? Then it's just a 2second job to jump out and (de)activate them. Might be a bit overkill in addition to a stronger ARB diff, but still. Anyone got prices for these parts, or know if they actually fit an IFS 100 ?

/Pete

dalh.webp
 
pete100 said:
See attached image from FSM. I guess this is from a rigid front axle, but it's the Toyota 100 series front hub locks. Instead of carrying around machined flanges, and the hassle of swapping them in situ upon a front drivetrain failure. Maybe it's possible to just grab a set of these parts, and mount them pre-emptively ? Then it's just a 2second job to jump out and (de)activate them. Might be a bit overkill in addition to a stronger ARB diff, but still. Anyone got prices for these parts, or know if they actually fit an IFS 100 ? /Pete
Click to expand...

AVM Hubs Slee Offroad sells them $860
 
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