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Originally Posted by maxwedge
I don't think so, 3800 series only.
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Shep, the 4T65E will definitely bolt up to the 3100 Vin "J" engine which was introduced with the 2000 Lumina. Not 100% sure about the 3100 Vin "M". However, the bolt patterns between the 4T60E and 4T65E appear to be the same. Major difference on the 4T60E is the vacuum modulator, PCM control/programming and wiring to the PCM module (20 way connector versus 7 way).
The GM RPO code for 4T60E is M13. For 4T65E either M15 or MN3 depending on which GM "W" body car it is. '97 and up L67 W bodies have the MN7, 4T65E-HD.
IMO the 4T65E is more problematic than a 4T60E.