TRNW-2: Identifying 8L series units

Wed Jul 9 12:32:56 PDT 2025

   Thanks !   I'm going to save that site for future part # lookups

    Steve

On Wed, Jul 9, 2025 at 3:12 PM art landeck via trnw2 <trnw2 at trnw.net> wrote:

> here is the link that shows what it fits and part number changed to
> m19434555
>
>
> https://www.moranchevrolet.com/CustomPage.aspx?path=%2Foem-parts%2Fgm-f-remanufactured-transmission-19434555&vanity_path=order-parts.html
>
> Steve Everett via trnw2 wrote on 7/9/2025 3:06 PM:
>
>   Thanks Jim!
>
>         Art looked up the part number I had and said it was for a truck
> with a 5.3 ,  so its a 90, definitely not what the manager told me it came
> out of, lol
>
>    Steve
>
> On Wed, Jul 9, 2025 at 11:16 AM Jim Mobley <hhcamobley at gmail.com> wrote:
>
>> Steve,
>> The ATRA 2021 Expo book has a lot of this information in form Steve
>> Garrett.
>> Also here is an article from Gears Magazine.
>>
>>
>> https://gearsmagazine.com/magazine/8l90-changes-and-updates-they-are-not-created-equal/
>>
>> On Wed, Jul 9, 2025 at 7:53 AM Steve Everett via trnw2 <trnw2 at trnw.net>
>> wrote:
>>
>>> Thanks Art ,
>>>            this unit has a 24285391 part number on the tag, and has 15
>>> pan bolts,  they ordered an 8L45 paper and rubber for it,  but the
>>> tailhousing gasket is much larger on this unit than what came in the kit ?
>>> according to that info it isn't a 90? maybe its a 50?  I may see if Reese
>>> down at Aamco U can dig up anything on identifying these ?
>>>
>>>     I pulled the top plate on the valvebody and all the dampeners are
>>> there and not a scratch on them anywhere, I'm pretty sure this valvebody
>>> was never run in anything,  not sure why or how it ended up on what was
>>> supposed to be a stock unit ?
>>>
>>>    Steve
>>>
>>> On Wed, Jul 9, 2025 at 10:40 AM Art Landeck <artrans at optimum.net> wrote:
>>>
>>>> Here is the answer AI gives
>>>> [image: bGVnYWN5_bd236d88-3f19-458b-a86a-3ccb9883f862.png]
>>>>
>>>> Identifying GM 8L Transmissions | Shared Grok Conversation
>>>> <https://grok.com/share/bGVnYWN5_bd236d88-3f19-458b-a86a-3ccb9883f862>
>>>> grok.com
>>>> <https://grok.com/share/bGVnYWN5_bd236d88-3f19-458b-a86a-3ccb9883f862>
>>>> <https://grok.com/share/bGVnYWN5_bd236d88-3f19-458b-a86a-3ccb9883f862>
>>>>
>>>>
>>>>
>>>> Sent from my iPhone
>>>>
>>>> On Jul 9, 2025, at 10:35 AM, Steve Everett via trnw2 <trnw2 at trnw.net>
>>>> wrote:
>>>>
>>>> 
>>>>    I can find nothing in any of the tech I have that helps to identify
>>>> a unit,  the tI'ag on the trans has 0XNL in big letters ,  assuming it
>>>> works like most GM units it is apparently a 2020 unit?  which would be
>>>> correct in a 2021 vehicle,  I'm sure the XNL would tell me something? I
>>>> just can't find anything that tells me what ?
>>>>
>>>>    I've agreed to work part time , 3 days a week at an Aamco here in
>>>> the Metro area,  and this is a stock unit they somehow ended up with,
>>>> another builder built it and had left two thrust bearings out of it, and
>>>> had at least one of the snap rings indexed incorrectly, but when it get it
>>>> all back together I need to make note of what vehicles it will fit in ?
>>>>  it has a brand new GM valvebody on it that they don't remember buying ?
>>>>
>>>>    Steve
>>>>
>>>> On Wed, Jul 9, 2025 at 9:56 AM pat schulte <zzyzxpat at gmail.com> wrote:
>>>>
>>>>> I know that the 8L45/50s I have seen do not use a dipstick and the
>>>>> fluid check is in the pan, but I think the very late 90s have gone that way
>>>>> as well. Not a stupid question, I have wondered this myself.
>>>>>
>>>>> On Wed, Jul 9, 2025 at 6:32 AM Steve Everett via trnw2 <trnw2 at trnw.net>
>>>>> wrote:
>>>>>
>>>>>> This is probably a stupid question,  does anyone know a way to tell
>>>>>> if an 8L is a 45,50 , or 90 by looking at the outside tag ?   similar to
>>>>>> how we identify the 6L's ?  I'm going through a unit someone built to make
>>>>>> sure its correct, and was told it came from a 2021 V6 camaro, which
>>>>>> according to what I looked up should be a 8L45,  but its not
>>>>>>
>>>>>>    I've built 6 or 7 of these, but haven't figured out how to tell
>>>>>> them apart yet
>>>>>>
>>>>>>    Steve
>>>>>> This message was sent from the TRNW Technical Discussion Forum
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>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Pat Schulte
>>>>> AAMCO Transmissions
>>>>> Temecula, Ca.
>>>>>
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>>>>
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>>
>>
>
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> TRNW Inc., 2825 Walnut Terrace, Modesto, CA 95355
>
>
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