i never thought to just 'look' at the tone ring thx! good tip about the fan varying sizes.

the number of plugs on the PCM is a good way to tell without taking anything apart. 4 plugs means 32 teeth, 3 plugs means 16 teeth. I've seen a lot of people end up with the wrong tone wheel when they are replacing an engine. Especially in 1st gen Durango, and 1st gen Jeep Liberty (since the 3.7 is just a 4.7 minus 2 holes.) They did the changeover mid-model year, on Durangos, 2002 is that year. Early ones had 16, late had 32. So getting a replacement engine for a 2002, you can end up with the wrong one. I am trying to develop a solution for Durango/Dakota hemi swaps which would also work on this. My idea is to CNC a tone wheel that mounts on the crank pulley, and relocate the crank sensor to read it, enabling a 32 tooth engine to run in a 16 tooth truck.

Great video pal. Damn sure wish I'd have found it before two days of chasing wires and grounds. Thanks though, huge help

I just changed my first crank position sensor today. I was having an issue when the engine was warm where it would hesitate to start. I put the new crank position sensor in and got a couple of misfires when I try to start. Not sure if my crank position sensor is bad? Maybe it's the wrong part number?. Like to ask a general question as you seem very knowledgeable is when I put the sensor in do I have to rotate the crank so that any part of the reluctor wheel is facing the sensor when I initially put the new one in?

You can also look at the timing mark on the passenger side cam wheel. They are different from 32 to 16.

Great information

Can the reluctor wheel changed in the truck? Its already installed and just cranks no start

Yes yes yes im learning so much that its usually better to eliminate through process my wife 2002 Dodge Durango has a bad idle I'm going to timing chain because I replace a throttle positioning sensor replace the air intake sensor replace all coils replace all spark plugs and it's still rough idles but when you get on it it runs like a hot rod just rough idle to wear it sounds like it's running out of gas and something broke inside the timing haven't took it yet will update as soon as possible Happy Father's Day my 2 month old is still sleeping

If I'm correct. When u said u have to take off the alternator to take off the black thing off that's sits in middle. No u do not have to remove the alternator. My engine is the same on urs. And it's locked I removed the throttle body and the black thing that's sits in middle. Without removing alternator.

I have a 2005 grand cherokee with the 4.7l looking to swap with exact motor and was wondering if anyone knows if the ram dakota durangos are the same. Is the tone ring count different jeep grand cherokee. I know they use two different systems jtec and ngc. Anyone has any info greatly appreciate the knowledge

What would I have to do to take a 4.7 from a 03 Durango to 00 jeep grand Cherokee

If the reluctor wheel has slipped on the Crankshaft why can't you tap it back in place and install a set screw or tack weld 🙂

Can I use a engine from 2002 Jeep Grand Cherokee and put inside 2003 Dodge Ram 1500 both are 4.7

Will it work if I have a 4.7 engine that's 32 teeth and swap out the relector ring that's 16 teeth? That's what I did truck cranks and turns on but has no power at all scanner says random misfire

So I didn't know this and put a 32 teeth Durango in my 16 teeth 02 dodge ram 1500 and it wont start. Pretty sure this is the issue now...how do I go about converting the change over so it'll work in my ram?

If u made the mistake of buying a 16-tooth when your CPU reads a 32-tooth, can't you just swap the reluctor ring on the crank and the sprocket on the cam to have the crank and cam sensors to read it correctly? Or is there something else that will cause this not to work?

Execuse my ignorance of this stuff, but what is a Durango? or whatever I heard when the technician was talking about things around the radiator and its fan.

So I ended up had to take engine out. Due to torque converter when couldn't turn the flywheel at the time. Whole trans and engine would had to come out. Due to more hazard to my self and vehicle. So I used rust rescue that I pour into spark plugs and holes let sit for week. Then I was able get the crank to turn. But only 1 full turn to right or left. Just enough to undo the bolts for the torque converter. When I got my engine out. I took off my valve covers. Finding out I have 9 out of 16 lifters were bad. How I can tell? Shake a bad one. And shake a good one. Bad one will have play sound. Good one won't. Due to I had 9 bad. I'm replacing all 16 hydrolic lifters. Cams rocker arms are good. Cleaned it. Let set in oil until the time to replaced back on. I went ahead replaced timing kit with new gears. When I checked the rods, pistons, and crankshaft. 2 rods were damage. 5 rings were damage, 3 bearings were damage. To be on safe side. I replaced all. Including new crankshaft. New flywheel. I replaced new freeze plugs. New seals, new gaskets. New oil pump, water pump. Tensioner. Almost everything on my engine is new. Accept for alternator Ac compressor. It basically took me 3 weeks to rebuild it. Took my time and done it the right way. But one thing I problem on. Getting the timing right. So I had my best friend mechanic came over to inspect my engine. And to recorrect my timing. He said I was 2 teeth's off. He went ahead resit the timing. Next 2 days. I placed on the timing cover and the others. 3 day friend came back over. Help me placed the engine back into my truck connected to the trans. With new torque converter. Connect everything else back on. Due to my friend came and help me. He took for first test run. He says it droved like a charm.

Dont you have to make sure if it has a egr or not?