So I am curious about a few things on the Benz portals. How do they deal with the fluid getting hot in the portal box? Is there a breather? What reduction does the portal box have? No problems at hwy speeds I guess? <--- that kind of relates to the first question. Are they a two or three gear design? I see they are a closed knuckle design, that is cool. But are they using a stock sized CV? One thing some people don't realize about portals is they put a lot of strain on the suspension. In particular the links if the truck is not sitting on leaf springs. The leverage created by the portal is massive and it exerts a lot of forces on the links not normally experienced with a standard axle. So, did Benz do something about this and buff up the suspension at all?
Fluid temp in our Portals is no problem at all, just ran mine for several hours strait on the highway at 80+ mph and they were just warm to the touch, didn't have a way to measure the actual temp so I had to do the touch test.
There are breathers for all the Portals, they tie into the breather lines for the axles so water submersion is no problem.
Honestly don't know what the exact ratio is, but the three gears are the exact ratio to compensate for the 37" tire, all systems work as normal and highway speeds are no problem at all.
Closed knuckle system does use a stock sized CV, no issues with reliability at all.
The leverage you are referring to I assume is the axle "roll out" that is created by the Portals. This is not an issue with the G Wagons because of the standard design of the two bolt mounting of the trailing arms to the axles. It controls the roll out completely.
Thanks mk216v! LeTech roof racks are currently out of stock here in the US and at LeTech, hope to have some ready to ship to me mid October.