Since this is a newbie question and I'm a newb I guess I'll answer. Crawl under the rear of the Jeep and there is a tag on the diff cover that will have it on there. If you have a stick and a D35 it will most likely be 3.07, if you have a D44 it will be 3.73. Don't know the auto ratios. This is assuming the gearing is still stock.
I opend a dana 35 with the bild paper and ax tag = 3.75 but the damn thing had 3.55 .... and jp build up on there dana 44 was a open carrier but jeep says they did not put in a open in a 44 so the best way is to open it up and count the R & P... my $0.02 :flipoff2:
If you don't trust the tag you can jack up the rear end . Spin the tire and count how many drive shaft revolutions it takes to turn the tire. If you mark them both you can get a good idea of what ratio it is.
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