dunno if you guys have heard this before.. but here is my issue... I have a complete ATS tranny (see sig) and live in a cold winter state... at night the temps are around 10 to 20 F ... here is the thing... if I don't plug my truck in at night and hop in it in the morning start her up and throw her in gear w/o idleing for 5 mins or so the transmission will stall the engine.. this prob is fixed by letting the truck warm up or keeping it plugged in.. what is the issue? no slip from the TC? thick atf? combo of both? what should I do? I called ATS and they said to deal with it, or they could swap out to a looser TC.. also that they only hear of this in much colder climates.

 

Probably a combo of thick fluid plus a low stall, very tight TC.

 

you need to get the cold weather flash

 

Hmm, nice customer service? I didn't realize ATS offered a low stall converter, who did they copy?
I’ve got a low stall converter and experience similar symptoms in cold weather. (My idea of cold weather is sub zero.) I've got a 12 valve so don't have the option to try Bob's recommendation

 

Mine did this in 90* weather. I have the GB tranny and TC. Cummins has since put a new block in my truck (had cracked 53 block) and it dont do it anymore. I thought it was the tight TC but it is fine now.

 

Don't be in such a hurry. Try this: start the engine and immediately, but gently, increase your RPM to 1000. Hold it there for a minimum of 1 minute. Put a stick on the pedal if you have other things to do. Shifter can be either Park or Neutral, both will circulate tranny fluid in an ATS. Drive away. This is my routine both summer and winter because it is prudent to let the oil and fluid circulation stabilize before driving, although I don't experience your problem if I drive off quickly like you want to do.

Use the trans fluid recommended by ATS and check the fluid level. My ATS, installed by ATS, has been trouble-free since installation. Looking at the BOMBs you have, it's possible your transmission is normal and your problem is engine-related with all that stuff working together to create a "weak idle" when cold. One clue is that you say after 5 minutes of engine warmup, or if you keep the engine plugged in, you have no problem.