Picked up an '04 Allison/DMax 2500HD back in March - first diesel & first
locking rear differential.

Question - is that differential always locked or can it be manually
engaged/disengaged? Does it lock/unlock when shifting in/out of 2WD/
4WD. It feels locked most of the time on pavement, but I don't know
how much of that is just the feel of the truck.

do a search and you'll find exactly what you are looking for.


The rear locks at slow speeds.

do a search and you'll find exactly what you are looking
for.
The rear locks at slow speeds.

Ah yes. Search. Good. (http://dieselplace.com/forum/forum_posts.asp?TID=5887&KW=lock+rear+differential)Edited by: inte

I hope that my coment wasn't taken as being smart... I did not have the time to do a search for ya. http://www.dieselplace.com/forum/smileys/smiley9.gif


I hope you found everything you were looking for. http://www.dieselplace.com/forum/smileys/smiley4.gif





Burner------------------> http://www.dieselplace.com/forum/smileys/smiley4.gif

The G80 'locking diff' in the GM trucks is the AAM TrakRiteLK (http://www.aam.com/technology/tech_prod_dl_diff.html#TRLK). Somewhere I recall reading quite a bit of detail as to how and when it locks. Basically it's a clutch type limited slip until enough of a wheel/axle speed differential is reached, where it then engages mechanically and locks the axles. Totally automatic. If you want to be able to control when lockup enganges and disengages, they have the TrakRiteGTL (http://www.aam.com/technology/tech_prod_dl_diff.html#TRGTL). There may be more info on the Eaton website (used to be there anyway).


Hope that helps!

Ah! I found it here on the Eaton website (http://automotive.eaton.com/product/traction_stability/lockingdiff.html)!