Folks,

I have a 4l85E tranny on my 06 GMC Savanna Cargo Van. It also has a detuned 250 HP LLY engine.

The dealer says that my tranny can take 440 ft-lbs torque max.

Does anyone know where I can bring my tranny to be modified so that it can handle more HP and Torque. I would like to tune my 06 LLY to bring it at least one level up.

I have an trailer that is close to 12000 lbs, so I want to bring my LLY power up and make sure my tranny survives the upgrade.

I live in Atlanta and Knoxville, so if anyone knows of a good tranny shop that can modify my 4L85E, I'd appreciate it. If there are no good tranny shops around here, I would even be willing to travel a few hundred miles for this.


Jojo

Folks,

I have a 4l85E tranny on my 06 GMC Savanna Cargo Van. It also has a detuned 250 HP LLY engine.

The dealer says that my tranny can take 440 ft-lbs torque max.

Does anyone know where I can bring my tranny to be modified so that it can handle more HP and Torque. I would like to tune my 06 LLY to bring it at least one level up.

I have an trailer that is close to 12000 lbs, so I want to bring my LLY power up and make sure my tranny survives the upgrade.

I live in Atlanta and Knoxville, so if anyone knows of a good tranny shop that can modify my 4L85E, I'd appreciate it. If there are no good tranny shops around here, I would even be willing to travel a few hundred miles for this.


Jojo

http://www.transmissioncenter.net/4L80E.htm

They only give Hp ratings but give a call for more info

Thanks for the info.

Might be a little overkill for me. (and too expensive)

I just want my 4L85E beefed up a little just to handle a 12000 lbs trailer instead of the rated 10000 lbs towing capacity. Since I only tow occasionally, I'll be happy with something that can handle 350 hp and around 600 ft-lbs torque.

Thanks for the info.

Might be a little overkill for me. (and too expensive)

I just want my 4L85E beefed up a little just to handle a 12000 lbs trailer instead of the rated 10000 lbs towing capacity. Since I only tow occasionally, I'll be happy with something that can handle 350 hp and around 600 ft-lbs torque.

Transgo shift kit, good converter and some Allison rated atf.:cool:

Thanks Mike,

Do you know if these modifications would affect the computer programming? Will it still shift at the same points? Do I need to program the ECM for these modifications? How will the "Tow/Haul" mode interact with these modifications? I've heard that the Allisons have programming to match the engine outputs and I was wondering if the 4L85E also have similar programming.

Do you know anybody in Atlanta that can do this? I want somebody who has a good reputation and history of doing this, so I just don't want to pick somebody off the yellow pages.

Thanks
Jojo

Thanks Mike,

Do you know if these modifications would affect the computer programming? Will it still shift at the same points? Do I need to program the ECM for these modifications? How will the "Tow/Haul" mode interact with these modifications? I've heard that the Allisons have programming to match the engine outputs and I was wondering if the 4L85E also have similar programming.

Do you know anybody in Atlanta that can do this? I want somebody who has a good reputation and history of doing this, so I just don't want to pick somebody off the yellow pages.

Thanks
Jojo

None of the mods I mentioned will change how the trans operates. The shifts will be more firm and converter will lock better and have proper stall and quicker coupling. I would make a phone call to Suncoast converter in Ft. Walton Beach FL. Talk to Joe.