4L60e 12585950

[Mikereal12]

Hello All,
I got a 2004 Silverado 1500 with a 4.8 and a 4l60e. The computer calibration is 12585950. The attached tune is what I pulled out of my truck and Im worried it isnt quite right... It says its for a 4l80e. I just put a rebuilt transmission in the truck and it doesnt feel quite right (500hp monster performance transmission with 2200rpm torque converter). Any advice on what changes I should make to get it right?

It should be noted idk what previous work was done on the truck but I got it from a shady dealership.

Many Thanks,
Michael Scott

[dave w]

Possibly the link below to the gearhead-EFI library of 2004 files will be helpful:
http://www.gearhead-efi.com/Fuel-Inj...rPro-Bin-Files

[Mikereal12]

Ive already gone through all those and couldnt find a 12585950 calibration with the 4l60e option on there... Is it bad to run my truck with it set to 4l80e or do I need to change it (setting says never change it)

[dave w]

Ive already gone through all those and couldnt find a 12585950 calibration with the 4l60e option on there... Is it bad to run my truck with it set to 4l80e or do I need to change it (setting says never change it)

The attached is a 2004 _ 4.8 / 4L60E OS 12585950

VIN 2GCEK19V441108877

[dave w]

The attached is a 2004 _ 4.8 / 4L60E OS 12585950

VIN 2GCEK19V441108877

Added to library - Post #81
http://www.gearhead-efi.com/Fuel-Inj...043#post102043

[Mikereal12]

The attached is a 2004 _ 4.8 / 4L60E OS 12585950

VIN 2GCEK19V441108877

Thnk you sir! It does look like alot of the transmission setting are different in yours. Hopefully making them match helps!