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03-Gwagen
Elite Veteran
Date registered: Apr 2006
Location: Western Pennsylvania
Vehicle(s): CLK63 Black Series, 2018 G63, 2016 GLE300d
Posts: 888
| RE: Transfer Case Oil Seepage Ceased
I changed the transfer case fluid last night.
Easy job. The drain plug magnet had a ball of black sludge sticking to it. It was about 3/8 round. It looked like a black rubber ball on the drain plug not sludge.
It does seem a little quieter with the red line in the diff and transfer case.
Dumb question...what does a transfer case do when in high range? |
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DUTCH
Administrator Doppelgänger
Date registered: Apr 2006
Location: US, GA, Atlanta
Vehicle(s): 2015 Audi Q7 3.0 TDI,2018 Sprinter
Posts: 9963
| RE: Transfer Case Oil Seepage Ceased
03-Gwagen - 5/19/2007 10:12 AM
I changed the transfer case fluid last night.
Easy job. The drain plug magnet had a ball of black sludge sticking to it. It was about 3/8 round. It looked like a black rubber ball on the drain plug not sludge.
It does seem a little quieter with the red line in the diff and transfer case.
That sludge ball is entirely normal.
I hope you did not use MT-90 in the diffs. 85W-90 Gear Oil is the choice for the diffs.
And I noticed quieter operation (and slight fuel economy boost) with the Redline, too. |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: Transfer Case Oil Seepage Ceased
originally the only need for a transfer case was to transfer rpm and torque to the front axle.
In high range it just passes on the rpm and torque created by engine and transmission.
Since there is a need for higher torque and slower speeds in off-road settings an additional gear is
needed in off-road vehicles. Could be achieved with an extra (crawler) gear in the transmission.
But that would mean you have to build a specific transmission for off-road only and it would only give
you one extra gear - and reverse would still not be low enough.
So rather than stuffing one more gear into the transmission, the engineers decided to add a lower gear
into the transfer case.
Advantage is that low range has an effect on all of the transmission gears - very importantly, also on reverse. |
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