my speedometer is going backwards i replaced the sensors but it still gose the wrong way?

really? holly crap, do you back up every where you go?
lol, are we talking odometer and speedometer? does the mile meter on the overhead do the same?

WTF? Have never heard of that. Hell, if your odometer is going backwards as well, worry about fixing it in a year..lol. In the meantime, just keep with the flow of traffic!

no the milage dose the right thing and the overhead gose the right way. some time the speedometer gose the right way but, 90% of the time its the wrong way. so when it gose backwards to 80 im really doing 60 so i go bye the tack all the time

humm, try cleaning the connector to the instument panel, its most likely that or a bad instrument pnl.

how many miles should i expect to get out of my jeep its a 93 jgc limmited with the 5.2. it has 180000

Depends on how well you've taken care of it. I know that notoriously, the I6 goes a bit longer mileage wise. I had the same engine in my 98 and I sold it at 114,000 miles and had never had a single problem with the truck.