The torque converter locks up for cooling. No slip equals less heat. As you apply the throttle, to accelerate, the converter will unlock allowing better torque multiplication to accelerate. Apply more throttle and it downshifts, again for the torque. The stock converter can't handle staying locked up and accelerating. That clutch material would not last long. You would have to change to a lower stall speed converter, to get the motor not to rev to 2,000, when just normal driving and accelerating. This will also affect your accelerating all the time. It would be slower. The 4.7 does not have a ton of torque. The higher stall converter helps with acceleration.

Brian

 

Can anyway reading this do me a favor please:

Put your Jeep 4.7 into gear, hold the brake with your left foot as hard as you can and slowly press the throttle. What revs do you get before the brakes can't hold it any more please?

i.e. where is your torque converter biting?

 

Only way to lower the stall speed is find a aftermarket TQ with a 1500-1800 stall speed or pull yours and have someone tweak the elements inside the TQ.

 

One mod that I have done that I like is my superchips flash pac. Use the tow mode. The tranny hold each gear longer before shifting. My wj moves much better.

 

I have read about a "line pressure mod" with a resistor (or kit) added to the wiring. This is designed to sharpen the shifts, but will it improve the TC bite?


I looked at the Superchips tuners, but wow, they are expensive for the small change I would like to make to my WJ.

 

I have read about a "line pressure mod" with a resistor (or kit) added to the wiring. This is designed to sharpen the shifts, but will it improve the TC bite?

I looked at the Superchips tuners, but wow, they are expensive for the small change I would like to make to my WJ.

For the record, currently running 91 Performance tune on mine and still don't really notice any difference in my shifts in daily driving.

 

Replace your knock sensor before you dig any further. Torque converter has a relatively simple job and it doesn't sound like that's the issue.

Knock sensor fault will result in the pcm pulling timing. There's power loss. Chrysler very well have a modified shift table as well when that sensor goes out. The pcm is trying to protect the engine.