FW Hubs
My experience comes from Landrovers with manual hubs and vaux/opel frontera's with both manual & auto hubs.
on the up side you do save a small amont of fuel..
In my experience fuel economy can be improved by leaving behind all the 5hit landrover owners carry.! - I'm one so i can say it..!
On the downside as only the wheels are turning you lose the splash lubrication effect on the top bushes of the wheel hubs.
With manual hubs once hubs are locked you are good to go however with auto hubs when engaged they take approx 1 revolution of the wheel to engage and lock so if you are stuck and need to rock back and forward to escape with auto hubs they constantly lock and unlock when you change direction.
So when stuck you engage reverse the wheel rotates once then engages with a shock load, then you go forward & the wheel rotates once then the hub engages again with a shock load.
Less components in a drive drain the bettter IMHO.
Regards All
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