Need to know the serpintine belt size to fit 2002 dodge ram 1500 4.7L

you don't ...if the belt is loose you need to replace the tensioner

I'am going to give you two pictures of....one 5.7L and one 5.9L don't know witch is yours??

this is farely easy to figure out from looking at your pullies. ribbed pullies normaly take the ribbed side of the belt and smooth pullies take the smooth side of the belt. i would start at the tentioner pully (which is smooth) the put the inside of the belt around the 2 nearest pullies and weave it alternating in and out of the rest of the pullies.

always take the negative battery terminal off to avoid shorting the charge wire. Next, remove the serpentine belt by twisting the tensioner loose. Then you can remove the alternator bolts. Let me know if you have more questions.

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http://www.dieseltruckresource.com/dev/help-installing-serpintine-belt-t183515.html?&highlight=fan+belt+diagram

scroll down to the 6th post

here you go, hope this helps
http://rides.webshots.com/photo/2262237260102867112XzwSRZ

If you buy your belt from Autozone the belt routing is on the package,If you already bought the belt you could always buy one from AutoZone and then return it after you use the routing.

no it needs a 3/8 drive

dodge and ply. all had this problem tensioner will tilt out under load and belt comes off happens more so when raining they make a kit to repair updated tensioner with a lip on pulley and grooves and a belt with ribs on both sides to keep it in line it is expensive i have replaced belt and tensioner but weld a ring around pulley as a guide to keep it from coming off or find a smooth pulley thats the same size with a lip on it