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Transmission RPO code confusion

6277 Views 4 Replies 3 Participants Last post by  Rivelite
Hello All,

Quick question for clarity. The previous owner of my truck has a documented 50k transmission fluid exchange interval that I would like to keep going. Being right at 150k, I will be scheduling a simple drain and fill transmission service with new filter and I am also considering have the shift solenoids (OEM) changed for preventative maintenance as well. My questions is how can I confirm which transmission I have. The RPO code in my glove box says M32. When I cross reference online, I see both transmissions under the single RPO code:

M32~ 4speed, HMD, heavy duty 4L60-E/4L65-E

Any ideas or direction is appreciated!

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The 6.0L Escalades had the 4L65e. Maybe the 5.3L Escalades had the 4L60e? The difference between the two transmissions is negligible. Both will bolt right up to your Escalade, and shift solenoids would be identical. Fluid capacities are the same as well as transmission pans/gaskets/fluid requirements.
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