DTT transmission issues

[Turbo Terry]

1999 Cummins 160k miles. DTT transmission is acting up. They have been out of business for some time. Does anybody know if someone who can help me? I have some questions etc. is Bill Kondolay still around and if so, can I get contact information for him? Who’s working on them now?

 

[DavidC]

List your issues and where your at for recommendations. There's a guy here in Phoenix that was a DTT installer but depending on where your at would determine how far you want to drive.

 

[SnoKing]

They still have their web site up. Phone number is the same and still rings!
http://www.dttdiesel.com/
1-866-504-4002

 

[Turbo Terry]

I’m in Alaska. Truck runs and shifts great. But in 4 th gear driving along at a steady speed in will stumble maybe 50 rpm or less. You can see it on the tach and feel it seat of pants. Might not be a transmission problem. Could be apps or maybe a fuel issue but I have good pressure and filter is fairly new.

 

[SnoKing]

I’m in Alaska. Truck runs and shifts great. But in 4 th gear driving along at a steady speed in will stumble maybe 50 rpm or less. You can see it on the tach and feel it seat of pants. Might not be a transmission problem. Could be apps or maybe a fuel issue but I have good pressure and filter is fairly new.

Did you have someone check for codes. Most auto parts stores will do that for you. SnoKing

 

[DavidC]

Doesn't sound like a trans problem. Any mods to the truck ?. I had a fueling box do the same thing. Maybe others will chime in so the more info the better.

 

[Turbo Terry]

Lots of mods edge. Rasp I’m thinking I have connector on the hosing loose somewhere and it’s sucking air somewhere. Two blue clues I smell diesel when I walk by in the garage. But floor is clean and it used to fire as soon as you hit the key. Now it’s cranks a bit more to start. A little air getting in the fuel system. Im checking connectors all in them I’m the am

 

[Turbo Terry]

Checking for codes is a good idea as well

 

[Turbo Terry]

Checking for codes is a good idea as well

I get no check engine light

 

[SnoKing]

You can route a clear line for the output of the fuel filter to a container, bump the starter and see if you see air bubbles in the line.

 

[SnoKing]

I get no check engine light

I believe that vintage RAM can have codes without a check engine light. I do not recall my 2001.5 24V turned on the check engine light, I was having a couple cases of dear pedal, and when checked for codes I had the dreaded P0216 VP44 death code. My DTT transmission caused a few other codes, and never a check engine light.

 

[DavidC]

Just a FYI my fueling box was/is also an edge, wound up buying another one and that was the same exact problem I had. Checking all fuel fittings is still a good idea.

 

[Turbo Terry]

I disconnected my edge box. It still does it. But the power loss was amazing and the drive ability sucked also. Just not the same truck

 

[Turbo Terry]

More info to chew on. I think it might not be the transmission at all but? Ok I have unbolted

the apps and checked the voltage on the tag .492. When I check voltage at pcm connector 1-#23 orange wire dark blue tracer key on not running I get .343 so does this mean the apps is bad ?

 

[Turbo Terry]

Is the apps bad. Or just need readjusted and why would it change??

 

[DavidC]

I am by no means an apps expert but I believe it is to be installed and then adjusted if need be.
https://www.bluechipdiesel.com/apps-installation

 

[Turbo Terry]

Bingo. I have 4 th gear hunting. I think. I have a DTT valve body and torque converter. Smart controller and Lock up and a DTT noise filter. To stop this. And BD exhaust brake. Alternator was rebuilt at 140 k. Now to find a fix. I still wonder if those differences in voltage apps is a problem ..

 

[DavidC]

This test
https://mopar1973man.com/topic/13280-ac-ripple-testing/

 

[Turbo Terry]

Ok I wrapped the wire from the alternator to the passenger side battery neutral connection. Did considerable test driving and 4 th gear hunting has stopped. .25 worth of aluminum foil. Just amazing

 

[DavidC]

That's funny I wrapped mine a long time ago and was not having problems. Hope yours is fixed.