8l90 swap, t87 questions.

General Tuning Questions And Discussions
TruckNorris
Posts: 7
Joined: Tue Jan 19, 2021 1:35 pm
cars: Lt4 supercharged 2016 gmc sierra

Re: 8l90 swap, t87 questions.

Post by TruckNorris »

VX L67 Getrag wrote:You can try that, but I don't think it will work as there's normally a security section that needs to be written thats not part of the HPT file(it's in the eeprom) so if you can't get that off your original ECM then it will either need to be re-linked or just disable theft options!
I am so down to get rid of the theft options, lol any input on how I’d go about doing that?
TruckNorris
Posts: 7
Joined: Tue Jan 19, 2021 1:35 pm
cars: Lt4 supercharged 2016 gmc sierra

Re: 8l90 swap, t87 questions.

Post by TruckNorris »

So, I’ve found another option I’m gonna try. I found a 5.3/8l90 flash on the hp tuners repository, I’m gonna segment swap the o/s in my factory ecm to be pretty much a clone of what I need, and then I just need the correctly programmed Tcm and it should work.
mytunes
Posts: 10
Joined: Fri Aug 26, 2022 10:44 am

Re: 8l90 swap, t87 questions.

Post by mytunes »

Bump for an older thread..

So I know that the Allison Diesel T87(a)'s can be overwritten to that of a gasser as i've done it with success with GM SPS.

I'm pretty sure that you can also do a full write with HP Tuners if you have the correct TCM OS you want to flash.

Pretty sure you have this sorted by now, but for anyone else looking...
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