The issue is how the cam sensor was installed. A new sensor will have a thick paper spacer on the end to set the critical air gap. Some aftermarket replacements have a thin plastic rib molded on the end to set that gap. If that type is reinstalled, that rib is supposed to be cut off, then a paper spacer is stuck on to set the gap. That spacer slides off and is done doing its thing the first time the engine is cranked.
When you don't use a new spacer, and the sensor is installed too far, it's the sensor that is damaged, not the tone wheel.
I can't find a drawing of the crank sensor. All I found is it is above the oil pan, on the left side. I never replaced one on this engine, but on many other engines, that sensor is behind the right cylinder head, in the transmission's bell housing. Most of those also use the paper spacer to set the air gap. The concern with those is there is a tone ring added to the flex plate with groups of notches, or cutouts. The Engine Computer reads the resulting signal pulses to know when a piston is coming to top dead center, and in some years, to know WHICH piston is coming to top dead center. It knows that because there are different numbers of notches in each group, and those numbers are different for different years. That means you must use the flex plate that came with the truck for that year, not the flex plate that came with the engine from a different year.
In this case, the tone wheel is cast as part of the crankshaft, and the part numbers for the crankshaft is the same for both years. The only thing you need to look at is if the crankshaft position sensor's mounting bracket is slotted, you need to use a new paper spacer to set the air gap when you install it.
I can't find any reference to the tone wheel for the camshaft, so I don't know if they are the same for both years. The people at the Chrysler dealer's parts department can tell you that. If it is the same for both years, the air gap is the only thing you have to worry about. If they tell you the tone wheel is different, you'll need to switch the camshaft sprocket, which I assume has the tone wheel on it. If you have to go through all that work, it would make more sense to just install a new timing chain and sprocket set for a '99. The old sprocket has worn to match the old chain. Also, I can't say for sure both years use the same number of teeth on the sprockets. Also be aware there will be a key way or a dowel pin to set the orientation of the sprockets on their shafts, and that could be different too, between the two years.
Wednesday, April 5th, 2017 AT 5:30 PM