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When it won't start someone will need to find out if you are dealing with a no-spark or no-fuel problem to proceed. If the check engine light is on you should get the computer scanned for trouble codes.
The starting issue is the same I had on my 2005 Grand Cherokee. The wire coming from the ignition (key area) to the Starter the connection is bad. The shop replaced the lead and it is perfectly fine... it cost $70. I dont know the techincal terms.. but it was easy to fix- the problem is water and junk gets splashed up by the front tire and corroded the wire into the sarter.... that's all it was.
The 46rh is a hydraulic transmission as where the 46re is an electric transmission. With minor wiring you can replace the 46re with the 46rh but not the other way around. Your transmission would stay in limp mode and wouldn't shift out of 2nd gear. So the answer is no.
First place to look is in the wires from the battery to the starter and the battery to the ground... got corrosion? this can really choke off the flow of electricity to the vehicle... check both ends of the starter cable and the ground from battery to frame (or block or trans) any kind of green or white deposits indicate it's time for new ones... this can be tricky because the corrosion can be inside the insulation on the wires... if corrosion is bad enough even a jump won't start the vehicle as not enough voltage will reach the coil... if the wires are good then it's time to check the coil and it's wiring... if you aren't real savvy at testing components with a meter then replace the coil (assuming good wiring) and test for spark by holding coil wire about 1/4inch from the block or any good ground while turning engine... you should see a nice blue spark... hope this helps...;-)
does it turn over? if it clicks and then stops really fast, it's your starter. don't worry, if it's the 4.0L it's an easy fix. 3 bolts and a hundred bucks and you'll be on your way. however, if all the interior electronics work, but when you turn the key nothing happens, you need to go through and clean all the electrical grounds and battery connecters. it happened to me (ironically my starter went out too) but that is the general problem. 1st gen grand cherokees are notorious for bad grounds.