Hello,
I have a 2003 avalanche 2500 8.1
I'm interested in getting this ecu. I have some exhaust and things done. what I wanted to know is I'm adding factory electric fans from like an 2006 and the harness/module that's pinned in to the ecu can you turn the fan control on in the ecu if I purchase?
The next is I have 35s (35x12.50r16) can you change that from the ordinal 265/70r16
Thank you. ( Brian, 12/11/2024 )

Yes, we can accommodate both requests. Just include this information when making your purchase.

Is it 50-60 hp with no other mods but the ecm ( Jeff, 05/23/2024 )

That is correct!

We already have a Banks exhaust system instaled on our 2004 W22 based RV. Will this work with the Banks system? ( Ashley, 11/02/2023 )

Yes, this is compatible with the Banks system.

Will this work for a 2002 Chevy C3500HD 8.1l with 5-sp manual NV4500? ( Matthew, 10/20/2023 )

Yes, it will!

If I get the tuned ecm for my 2006 chevy c5500 rv, do you have to get the TCM as well? If not, is it recommended?
Thanks ( Nick P, 09/09/2023 )

We do not tune the 2006+ Allison TCM so you would only be doing the ECM.