4l80e swap help

[05chevy]

i just did i 4l80e swap on my brother 99 1500.
He purchased a conversion harness off of the internet. Came with the adapter and new pig tail and pins to install the second speed sensor. we also installed a 243c transfer case that bolted right up to the 4l80e. almost every sensor on the transfer case is different except for the 6 pin plug on the motor. this transfer case only has 1 speed sensor also.

My main issue is that the truck feels like its in high gear. Hardly moves forward. I copied the transmission files from a 12212156 o.s. Truck still did the same thing. Hardly moves forward. I also recieved a P0740 and P0785. I think I have read that i have to shut those codes off to make this transmission function? Is this true? Here is the stock 4l60E tune from his truck. stock 99 5.3 tune.ctz

Any help with be appricatied. thank you

[05chevy]

Any help?

[joecar]

When it's in gear (Drive) what does the pid GM.GEAR show...?

What DTC's do you get...?

[joecar]

Disable P0785 and P0740 (in the Engine Diagnostics and the Transmission Diagnostics segments) and see what happens.

[05chevy]

D3. And will go from unknown to D3 when changing gears on the column.

I hooked a modis to it and can control all the solenoids. In the trans. It's almost like something is holding the truck back

[joecar]

Set D0961 and D0962 to 100% in all cells.

[joecar]

I don't think this matters, but set the correct ratios in D1201-5.

Also:
- set D0925-7 to be below D0910-2,
- set D0930-2 to be below D0915-7.

[joecar]

D3. And will go from unknown to D3 when changing gears on the column.

I hooked a modis to it and can control all the solenoids. In the trans. It's almost like something is holding the truck back

That's the wrong pid (GM.PRND)...

look at the pid GM.GEAR, it shows the actual gear being commanded by the PCM (i.e. it shows one of: 1st, 2nd, 3rd, 4th).

Also, check the manual gear switch on the side of the case, make sure the switch and/or harness are ok.

[5.7ute]

Was the trans segment you swapped in for a 4l80e?

[05chevy]

I copied and pasted from the 12212156 O.S. I got off of holdencrazy.com. into the stock tune off of the truck