Mongo, you must be or have been an English grammar teacher. lol.........Why isn't just "Locked" good enough, why do you have say rigidily locked?
......Nowhere in that write up do they say both differentials are locked together.
........Also, nowhere in that write up do they say it "rigidly locks"....
What Transfer Case does you Ford F150 have? Not all transfer cases work the same....
Most Transfer cases that are capable of Full Time 4WD, have a differential, with additional equipment to lock that differential if its capable of Part Time 4WD....
Locked, ridgid, ridgidly locked...whats the big deal.
By the way you didn't pick up on my incorrect spelling of ridgid which should be rigid!
RIDGID is the brand name of a tool line Home Depot sells.
My F150 does not have the Tcase with the 4Hi AUTO feature. Its strictly a part time 4Hi or 4Low only Tcase.
In 4Low a motor engages low ratio gears in the Tcase to increase engine torque and transfer that torque to the front diff.
Ford F150 4x4 trucks also use whats called an IWE (Integrated Wheel End) at each front wheel hub which decouples the wheels from the front axles during 2Hi mode. This is accomplished by the use of a vacuum operated mechanical clutch at each wheel hub similar to the hand operated wheel lockers on old school 4x4's.
My XJ's NP242 Tcase is has 2Hi, 4Hi part time, 4Hi full time and 4Low options.
In 4Hi full time mode, a clutch pack in the Tcase allows front to rear diff slippage when turning.
Not so when in 4Low or 4Hi part time.
Back to GC's eLSD.
My point is when in 4Low and say doing some serious rock crawling wheeling its beneficial to have both rear wheels rigidly locked (haha) instead of an electrically operated clutch which engages/disengages on the fly.
For example, when going up a steep rocky/bolder incline with one rear wheel off the ground, you want that wheel to have full torque applied the moment it finally touches down.
There's a reason hard core rock crawlers install rear diff lockers instead of relying on a LSD diff.
The clutch pack in the eLSD far as i can tell could be firmly engaged 100% of the time only when in 4Low.
It likely wouldn't be as good as a true locker with probably some clutch slippage.
But the GC is not a Wrangler Rubicon and Jim_in_PA is probably right in that the eLSD operates the same whether its in 4Low or 4Hi.
Again from the Owner's Manual:
....When additional traction is required, the 4WD LOW
position can be used to lock the front and rear driveshafts
together and force the front and rear wheels to rotate at the
Note the word 'lock'. Is the Owner's Manual also misleading?
Whether 'lock' should be taken as face value the true meaning of the word or whether they really mean rigidly coupled.
I don't know how my GC's Tcase transfers torque to the front diff in 4Low the reason i'm interested in all this.
Mongo, i'll take your explanation that it uses the clutch in all modes of operation which does make sense.