Are jeep wrangler 4.0 Sarah 6 cylinder or 4 cylinder? And does that matter?

The 4.0 is the six cylinder dumbass.

six cylinder, one of the best 6 cylinder engines ever built

Wow some people are just as rude here as in the maintenance section.

Some one called you a troll, another called you stupid? 

People like that must have had harsh up bringings. 

Just because you own something doesn't mean you're obligated to know it inside out.

I dont even know how to take apart my guns, of anything about my TVs, or the type of steel my swords have. 

Anyway, I think you have a V6.

The noise could be the starter.

Autozone uses a computer to make sure you have the right battery.

Your Jeep has an inline 6.

Get a multimeter.  Check battery voltage and charge the battery if voltage is below 12.6V.   Check the battery voltage while cranking,  If the voltage drops below 9.6 volts, the battery is bad or not the correct battery for your vehicle. 

If the battery is fully charged the starter should work.  If it just clicks you have a bad battery connection or a dead spot in your starter.

Chances are that your engine is FLOODED< so put your foot to the FLOOR and try starting AGAIN! SADLY the batteries at AUTO ZONE are PURE JUNK and NOT worth buying! Many cars with computers will simply REJECT THEM! Their top of the line only gives a TWO YEAR warranty! That is a CHEAPLY made POS battery! Get a FACTORY BATTERY or go to a JUNK YARD and get a proper INTERSTATE USED or even a MOTOR CRAFT. The BEST batteries are found in JAPANESE and EUROPEAN cars! PANASONIC is GREAT.   AUTO ZONE used to carry REAL batteries like MOTOR CRAFT and AC DELCO< but NOW they sell PURE JUNK!  MANY JEEP engines ALSO are junk! The 3.7 is in LITIGATION for dumping ROCKER ARMS! It is a VERY VERY POOR design and the ROCKERS have NO RETAINING CLIP! The 3.7 engine lines up in JUNK YARDS daily! The NEW ones are VERY GOOD the MULTI AIR engines from FRANCE! ANYWAYS put your FOOT to the FLOOR to open the throttle body WIDE and it should start>>>ALSO replace the A SPARK PLUGS using DENSO TWIN TIP IRIDIUM LASER PLUGS! They are SUPERIOR and at only $7 each a MIRACLE PLUG that improves POWER, MILEAGE and LOWERS emissions! TRUST ME about PLUGS! For some reason JEEP and CHRYSLER are devoted to LOUSY CHAMPION PLUGS that FAIL in startups and CAUSE issues like this one! EXPECT up to 20% MORE POWER and ECONOMY from them! JEEP also uses the CHEAPEST BOSCH injectors they could FIND< but they are STILL BOSCH< the LEADER in INJECTION technology! OPEN the HOOD and READ THE ENGINE STICKER to find out WHICH engine it is! ANSWERS is DYING! VERY VERY SAD!>>>ALSO POWER WASH teh engien bay with GUNK ORANGE to improve CONNECTION on WIRING HARNESSE and to keep the HARNESS SUPPLE and NO FRY from engien heat! CLEAN the space beaten the RADIATOR and the AC CONDENSER where LEAVES< twig, dread grass, BUG bodies and ANIMAL NESTS have been COLLECTING for YEAR! You CANNOT hurt the engine and the IGNITION is SEALED ! GOOD LUCK! The AUTO ZONE battery uses THIN CASTINGS and IMPURE electrolytes! That is WHY they will NOT warranty them  for long! The AMERICAN WAY! Sell CRAP for HIGH prices!