2005 Red Brawn Xterra S 4x4
Join Date: Sep 2006
Location: Whittier, CA
There are smarter people than me on here and I'm sure they will comment with more detail (and correct me where I may be wrong)... but here's something I learned recently that surprised me. In our cars, when the front wheels are spinning, the CV axles are spinning, which means the diff gears are spinning, which means the front drive shaft is spinning. This is true whether the car is in 2wd or 4wd. The only difference is when in 4wd, everything is spinning because the transfer case engages the engine power rather than momentum, as is the case in 2wd. I assume the assumption that it was safe to drive in 2wd with mismatched gears was based on the incorrect notion that if you are not in 4wd, then the the front diff is static and not moving.
Last edited by maytawn; 11-02-2018 at 03:16 PM.