The original jack was a crappy scissor jack like the one that's on my honda accord. There's a mount on the inner passenger fenderwell where they mounted them. Don't get one! I had a blowout one day and couldn't get the factory jack to even start going up. You have to take the thing off, hose it with penetrating oil, and put it in a vise to get it to go up (and I did this about 2 months before the flat) It also has to go waaaay up before your tires come of the ground. That inner fenderwell just has too much mud/ water go in there and it gums a scissor jack all up. My suggetion is to get a high lift with either a bumper or spare tire rack mount. If you are on the street most of the time, get an old screw jack from an early 80's GMC or chevy pickup, or a hydralic cylinder shaped jack. Thats' what I have in my jeep now (the GM jack) and i just pop it under the spring perch and go. If you have a high lift (to be added to my tire rack soon), be careful with it. I'm gonna get the little hooks that hang off the high lift and hook them on my frame mounted D rings I have on all 4 corners (if I get a flat off pavement and can't get the screw jack under the jeep).
85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT
85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO