The 3.9L V6 didn't use a knock sensor. The 3.7L V6, used in 2004 and later, had one though.
SOURCE: engine light came on, doesn't up-shift
The transmission is in limp in mode. The check engine light is on because the transmission controller told the engine controller to turn it on. You will have to get the fault codes checked to diagnose the problem. Expect to find a P0700 code in the engine controller. Thats the code for a transmission fault in the trans controller. It could be as simple as an input speed sensor or as complexed as an internal failure. Either way have the transmission fault codes checked for a proper diagnosis.
SOURCE: the engine knocks at higher rpm, only at high rpms
First no matter what check the oil level and then if it's a high rev tapping you need to allow the oil to flow through the engine block to try to coat and settle your valves.
But if it's really " knocking " sounds like your lifters and rocker arms are allowing your piston rods to clatter and that needs to be looked into fast.
SOURCE: Manual transmission oil change method - Dakota
Disconnect the plug underneath to drain fluid, look in your service manual to find the capacity and viscosity. There is a plug in the side of the transmission as well that is the filler plug, however it is more convenient to pour through the shifter once you remove it. If you use the filler plug method you will have to attach a tube to the oil bottle and squeeze it into the transmission as there may not be ample room to tilt the bottle and use gravity.
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Testimonial: "Thank you for this tip. The manual does not show capacity for the transmission but I found on other forums that the amount seems to be 4.8 liters."
SOURCE: 2001 dodge durango 4 wheel drive not working loud knocking
You need to check the cv joints in the front end or the u joints in the front drive shaft.If none of the above then the problem is internal in the front diff.
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