Transmission downshift problems/fix?

[SF Jakey]

I've got a 02 2500 4x4 ccsb D/A w/285's and tow a boat that is about 10,500 on the trailer. When in tow haul mode, the tranny likes to stay out of OD, so I'm turning hi rpms to go 65. Is there any modification to make it stay in OD and use the existing torque in the motor to travel at 65. I'm stuck going 50-55 to keep the rpm's low enough, and with the high rpms, the fuel consumption really sucks, like 7-8 mpg. I've thought about the juice box, but I don't know if it helps with the shifting. Are there any tranny upgrades to keep it locked up in 5th? On long flat stretches, I take it out of tow/haul because I seem to be able to control the shifting better, am I frying the tranny doing this? I also watch the trans temp, and it never goes over 200. Any suggestions?

[More Power]

I'd bet another 40-60 hp would solve your problem of not being able to run in OD more of the time. Have a look at the various product reviews (link in my signature) to get an overview of what is available.

My own towing experience indicates a little more power allows the trans to stay in OD almost all the time while towing on the highway. Boost/EGT gauges will help keep you out of trouble. smile.gif

MP

[bluenote]

When you get up to the speed you want, take it out of tow/haul for a few seconds and it will most likely drop into OD. Then you can re-engage tow/haul and it will stay in OD as long as you don't put more of a demand on it. Mine generally won't shift into OD with tow/haul on until about 63 mph, so I use the above method almost every time I tow. I like to tow at about 62-63 mph and it will maintain OD quite well at that speed with tow/haul engaged.