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C3 Transmission

MHLY01

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MHLY01 Enthusiast

MHLY01

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Does anyone know what tranny is in a C3 pickup? I have heard 4L65EHD and 4L80E> Want to make sure before I get a converter to get the right size. Thanks

Shaners Senior Enthusiast

Shaners

Posted
Posted

I would think it is the 4L80E, but what you should do is look in the glove box at the list of RPO codes, and then compare them to the codes for the corresponding year from the list of RPO codes that you see in the left hand column on this page under the "Features" section.  For example if your truck is a 2001 and the code MT1 is in the glovebox, then you have the 4L80E tranny.

 

Hope this helps...

RyanbabZ71 Senior Enthusiast

RyanbabZ71

Posted
Posted

I thought (i could be wrong) that the C3 had that new 4L85E tranny?

Shaners Senior Enthusiast

Shaners

Posted
Posted
I thought (i could be wrong) that the C3 had that new 4L85E tranny?

Then you should have a RPO code of MN8.  Here we go again with the great mystery question...  What actually is the difference between the RPO's MN8 and MT1.  Both are shown as a 4L80E...

C3Sierra Enthusiast

C3Sierra

Posted
Posted

Our trucks have the 4L60 E-HD transmission in them. I think the 2002 Sierra Denalil has the 4L80 due to the lower rear end ratio 4.10 and the increased trailering capacity - 10000lbs. Hope this helps.

MHLY01 Enthusiast

MHLY01

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Posted

I looked it up today, it had M32 which list as a 4L60E with Tow Haul. thanks for the help everyone. Now I wonder which converter I should get......    :D

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