TRNW-2: Identifying 8L series units

[Steve Everett]

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 (trnw2).
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>>
>>
>>
>> --
>> Pat Schulte
>> AAMCO Transmissions
>> Temecula, Ca.
>>
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