2007 cadillac escalade wont shift out of first gear?

If you tackled a snow bank, crawl under the truck and see if there is snow wedged in and around the shifting mechanism. You sound like you are talking an automatic transmission, but there may still be exposed linkages between the shift lever and the gear box. If you can't see anything, get it towed home and put it in a heated garage for 24 hours. This will melt any snow that may be hiding from you but screwing up the works. After the 24 hours are up, check again and see if there are any wires or other connectors which have come loose. If you can't find anything and it still will not shift, check for recalls to see if there is known transmissiion problems that Cadillac hasn't told you about. The following links are for USA and Canadian recalls. If it is a snow related problem, it may be picked up in Canada sooner than the USA.

http://www.recalls.gov/

http://healthycanadians.gc.ca/recall-alert-rappel-...

If something bypass with the Cadillac, i assume... You do understand that the two a variety of "automobiles" are built off of an identical platform?(chevy silverado, tahoe, suburban, hummer1, hummer2, caddy escalade... you get the image, and use an identical engines and transmissions... so all your procuring is a "different seem" and indoors layout, perhaps another stuff in spite of the undeniable fact that that is all off of an identical platform. superb needs... "/JOe

First im surprised you have problems with an 07 and replaced trany unless you had like 200,000 on it anyway same as above check underneath

I doubt it is the tranny. Like above said, I would look underneath & make sure the snow didnt get into places it shouldnt. Any Check Engine Light on????

Check your motor mounts