i had same problem on my 98.5 tried a few of the things listed and they all worked or at least for a little while now the new thing i have tried is while driving if its starts doing it i pull over and wiggle the battery cables not the terminals but where the cable goes in to the terminal check your cables look for corosion around the terminals your cables may need to be replaced did mine and its been fine since

 

Its the Happi box. www.happibox.com I dont know about the ats filter, but I can tell you that the Happi box fixed mine and I would have paid any price for it. The dealership told me that of all the trucks that they service (with this problem) there were 2 that they couldnt fix. One was mine. I bought the Happi box and have not had another problem for 2 years (knock on wood).
I think the Happi box does a little more than just filter the signal.

 

My truck had a simular problem. It would shift back and forth between 40-50mph. I took it to a dealer and they tried to get me to buy a new apps sensor but i said no way with a $500 price tag. It still did it for another 3 months after this and one day it just all of a sudden started working like it should. So i never did find out what was causing it. Good luck.

 

the ats fix i posted is not a filter but a way of rewiring some things to get a better ground without rf noise from the alternater.

 

No it's not "good" for your torque converter to be going "lock/unlock" in that manner. That's my story and I'm sticking to it....


....and an interesting story. I once installed a lift pump on a truck and the customer left and came back within 15 minutes stating something wasn't right. Went for a ride with him and the torque converter was locking/unlocking. He swore it never did anything like that. I installed another pump and no problem. Scary huh!?!

 

I just fixed mine this weekend, I what i did was very simple, I used the bolt on top on the APPS housing and wired it to the negative terminal on the driver side. I will have a pic soon in my gallery.

 

the dealer just installed an intank transfer pump and then a week later a vp44 this is when i noticed the tc locking/unlocking

 

im missing the bolt on top of my apps housing could this be the problem? what kind of bolt is it could i by at a hard ware store or is it some kind of special bolt that i have to buy from the dealer for 3 or 4 hundread dollars?

 

I think that works for most with the problem, but some it doesnt help. Like me.

 

What part did you use from this site?

 

This seems to be a common problem as my truck was also doing pretty much the same thing and a freind ran some flash programs on it which didnt work then he ran another flash program on it and cleaned some connections or something on the apps and it was fixed..........never new which one fixed it... I wouldnt think it would damage your tranny but it cant be good for it either...

 

I don't know if this is the same as above (couldn't get the link to work) but this PDF file instructions fixes the problem 90% of the time.

 

I have a 1997 dodge cummins. the problem you have sounds the same as mine after i had my trans. rebuilt. my problem was the throttle position sensor. $250 at the dealer. i kept calling the place that did my trans telling him the problem and that is what he what he said it was, i switched the sensor and the problem was fixed.

1997 dodge cummins 2500 Gear Vendors 8 speed overdrive, stage 5 TST fuel plate, 4" exhaust, 370 injectors, .019 delivery valves, DTT trans, turbo silencer MIA, X monitor, 4:10 gears w/ limited slip

 

here's the pic,


all I did was connect a wire from the top of the APPS housing to the neg on the drivers side battery, I just added split loom to dress it up