8L90 backwards compatibility with Gen IV? - CorvetteForum - Chevrolet Corvette Forum Discussion

Ask Tadge Post your questions here for Corvette's Chief Engineer Tadge Juechter and then discuss the questions and his answers.

8L90 backwards compatibility with Gen IV?

Closed Thread
Thread Tools Search this Thread
Old 02-02-2018, 07:08 PM   #1  
CF Senior Member
Thread Starter
yrkZ06's Avatar
Member Since: Mar 2010
Location: York PA
Posts: 109
Thanks: 0
Thanked 0 Times in 0 Posts
Default 8L90 backwards compatibility with Gen IV?

Hi Tadge and the GM staff,
I would like to know if the 8L90 transmission and more specifically the transmission controller is backwards compatible with the Gen IV PCM's aka powertrain control modules...?

I see that GMPP offers their own specific controller, and specify that it has to use a certain Gen V PCM in order for it to work.

Do both the Gen IV and V use the 29 bit gmlan protocols and are they compatible?

More specifically speaking corvette PCM if it matters.

I know that if you search for 8L90 swap that there are a lot of people that would much rather use the 8L90 in place of the 4LXX and even the 6LXX families for swaps and conversions.

If you do not currently have anything would it be possible to release something? Kind of the reverse of what you did with the Gen V that had the 6L80 until the 8L90 became available?

This would be very popular again with retrofits, and even people that are doing LS swaps.
Some 6 speed people who race tend to lean towards an automatic for consistency especially when they can shift in under 200 milliseconds

Thank you for your time...
yrkZ06 is offline  
Old 02-02-2018, 07:24 PM   #2  
Tech Contributor
Support Corvetteforum!
jvp's Avatar
Member Since: Mar 1999
Location: Oak Hill VA
Posts: 8,292
Thanked 1,115 Times in 325 Posts
"Ask Tadge" Facilitator

I'm sorry, but we're not going to submit this to GM as it's referencing aftermarket swaps/mods/etc. Hopefully you understand that.
jvp is offline  
Go Back   CorvetteForum - Chevrolet Corvette Forum Discussion >
Reload this Page
  • 8L90 backwards compatibility with Gen IV?
    Closed Thread

    Related Topics
    Thread Thread Starter Forum Replies Last Post
    New Fueling Options: LPE Earl H C7 Forced Induction/Nitrous 27 12-12-2017 02:01 PM
    RE: Major Mods 58XX conversion, 6L90 confab C4 Tech/Performance 25 09-07-2017 01:59 AM
    C5 Z06 engine swap to LS3 or LS7 conradb Engine Mods 17 05-16-2017 04:29 PM
    Looking to swap my LS6 for an LS3 or LS7 conradb C5 Tech 5 03-17-2017 11:45 AM
    Twin Turbo V-8 marcouvo C7 General Discussion 6 09-24-2016 03:47 PM

    Thread Tools Search this Thread
    Search this Thread:

    Click for Advanced Search

    Posting Rules
    You may not post new threads
    You may not post replies
    You may not post attachments
    You may not edit your posts

    BB code is On
    Smilies are On
    [IMG] code is On
    HTML code is Off
    Trackbacks are Off
    Pingbacks are Off
    Refbacks are Off

    Forum Jump

    Sponsored Ads
    Vendor Directory

    All times are GMT -4. The time now is 03:55 AM.

    We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.