Mine does the same thing. 3.54 gears with 35" tires and an automatic just doesn't cut it in 4hi anymore. Now, drop her in 4 low and that's a different story.

 

First a limited slip can only do so much. With all the power the cummins puts out, its only gonna do so much. Otherwise a full blown locker will be needed. The driveway situation has equal traction; the snow situation one is getting more than the other. once the the tire gets spinning even less traction is to be had.

blk dually, did you try shifting down a couple of gears? maybe that could make the converter lock up... I dunno about these autos though cause i have the 6 spd. you have enough fluid in the tranny? otherwise the others are probab;y right and the converter is just sucking the power. i bet if you had a tranny temp guage and did it again you could watch the needle rise after a little bit.

 

thanks guys, but none of the tires would spin when I put it in the deep snow I tried 1st gear, 2nd & reverse without moving the truck.when put 4 low the truck spun the tires and it was out. i ve talk to a few other guys who say that in 2 wheel 1st gear & a little brake pressure they can light the back tires up,not mine even with the bullydog in any of the settings the truck loads up RPMs go up about 2200 2500 without even a slip off a tire. I guess I 'll be looking for a torque converter

 

Is your truck still under warranty? I read you had it flashed. Maybe a different dealership might step up and look into the converter. The stock converter just doesn’t cut it for the diesel. As said above an aftermarket converter is what is needed. Even if the dealership put a new one in I believe you would still have issues. If I put my auto (with OEM) converter in manual 1st gear it pulls allot better. I don’t know if you tried this or not.

 

2200 rpm is the rpm at which the stock converter lets the motor rev to, at least with a 48 re and the 600 motor. If I floor mine and hold it with the brake until it's done building boost, it's at 2200 rpm. Snapping my foot off the brake results in immediate brisk acceleration. This is with my dually. When I had a 2500, the same rpm was reached, but letting off the brake resulted in instant tire smoke from both rear wheels. The difference is the increased traction of the dually. I can't imagine you're reaching full throttle and 2200 rpm w/o wheelspin unless something is very wrong, or your foot is still on the brake. Even with 3.73's and a SO, if you floor it and stall it all the way up against the converter, something ought to be happening.

 

In late 03 my best friend and I bought 2 new trucks, both were HO with the 48 trans. I moved back to San Diego and first noticed that when I was trying to back over a curb in either high or low range the tires would come up against the curb and the motor would go to full stall and the truck would just sit there and not spin the tires. I have a 05 now and bought a 6 speed since I have seen enough from the slushbox Chry is using. My friend stayed in Elizabeth Colorado and the problem he was having was identical but it was caused by snow building up in front of the tires and he could not get the truck to move either, you can imagine how embarassed he was when he had to get his girlfriend old stock Ford gas motor to move his truck for his to break the snow down so he could drive to work. We both spoke to many people and it seems like the consensus was the way they had the low boost fueling set up on some of the 03 trucks--I would try a box that lets you turn on more low boost fueling before I tore the trans out for converter replacement