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Thread: 8l45 interchangeability - 8L45 experts come on in!

  1. #1
    Advanced Tuner
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    8l45 interchangeability - 8L45 experts come on in!

    Hey guys, I have a really quick question.

    My daughter's 2019 GMC Canyon with the 8L45 transmission recently had trans failure. I found an 8L45 out of a 2021 GMC Canyon I can get. My question to you folks is, is the transmission interchangeable since the TCM is external?

    Please excuse my inexperience with the 8l45 as I am mostly familiar with the V8 GM transmission interchangeability.

    Thank you in advance!
    2009.5 PBM G8 GXP M6 W/Roof-Self tune, OBX LTs, Kooks axleback, LSA blower, cam,
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    2007 TBSS-Self tune, bolt ons [email protected], 1,900 D.A
    1991 GMC Syclone- Self tune/catback 12.8@104, 4,200ft D.A

  2. #2
    Tuning Addict blindsquirrel's Avatar
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    https://www.car-part.com

    screenshot.16-12-2023 14.35.52.png

    Too many options, not enough info. That site is where I would start though by looking at which other years were listed in the results.
    GM Gen4 Injectors v2.1.xls
    ChatGPT is the end result of someone assuming that if they gather up a large enough pile of sh*t it will spontaneously generate a pony.

  3. #3
    Tuner in Training
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    If the truck is 2WD, it has the M5N variant .. which is used in 2WD trucks and many cars and SUVs. If it's a 4WD truck, it uses the M5T variant.