Can't help with the trans, but the temp sensor goes to the left or right of the tstat. It's burried done in there. And what is an air/fuel rad sensor?

Also I just noticed yours is a 96, 98 only uses one temp sensor and it's under the alternator. The other one on a 96 is under or nearby the AC unit.

 

And look at this thread, your tranny issue may be listed. https://dodgeforum.com/forum/2nd-gen...diagnosis.html

 

Okay on my motor kinda under but behind the alternator is a senor witch im think its a air charge temp senor? But Thats the only senor i can find now on my old 318 that came outta my truck and that same senor but it also had a senor to the right of the Thermostat housing witch they are both on the i wanna say intake? But on my new motor they is no please to put a senor to the right of my thermostat housing. The only place i can find a spot to put the senor is the spot behind my alternator witch already has a senor in there but is not the temp senor.. Hope im not confuseing you.. Thanks For the help and im going to check out that link you sent me

 

Like I said, the one under the alternator is the ECT= Engine Coolant Temp sensor which doubles as the sensor for the gauge on a 98. The air charge sensor is on the passenger side of the intake towards the front and on the side of it. Unless the 98 intake has a plug in the hole to the right of the tstat where you can install the temp gauge sensor, then your best and probably the smartest thing to do, along with replacing the lower intake plate with one from Hughes Engines, would be to swap the intakes. Take some pics and post them if you can.

 

Dude, learn how to spell and construct a sentence or you'll have a hard time getting answers or understanding the technical nature of much of what's in here.

 

Ram1500,

Did your truck shift properly before the engine swap? If so, I would start by checking

a) mechanical linkage of the shifter and tranny
b) electrical connectors for the tranny (did you leave any unhooked)

 

Okay. Now on the 96 where the motor has the 2 senors one by the alternator and the other by the a/c. but since the 98 motor only has the spot for a senor by the alternato, The senor that is there now im not to sure what it is for. If I unplug it the truck will not run at all. But it does not run the gauge in the truck for my temp. I will try and get pictures put up tomorrow of it Thank you for all the help..

And The trans did have a problem before i did the motor swap i cant go from 2nd to 3nd but before the swap it would go but no all the time like it should it would be once in a blue moon.. But now it does not wanna go outta 2nd at any time..

Thank You for the help

 

OK, last time I'm saying it! LOL The 98 only has the ONE sensor ECT, Engine Coolant Sensor under the back of the alternator. It tells the PCM the temp of the motor and ALSO is for the temp gauge. The 96 has two, the one under the alternator is for PCM and the one by the AC unit is for the gauge. And unless there is a brass or steel plug you can remove to install the sensor under the AC unit from the 96, you need to swap intakes.

And then we have the IAT also known as air charge sensor, it should be located right in front of the end of the passenger side fuel rail, on the side of the intake.

 

Well I'm gonna say the tranny issue is the most common two things to fail and cause these symptoms. I had the same issue too.....transducer (or also called the govenor pressure sensor) and the govenor pressure solenoid...both easy to get to when you drop the tranny pan......could also be the speed sensor (might just be covered with shavings) or the throttle position sensor...
There a couple other recent threads about this you could search for also for more info.