AT in engine number

[JFP in PA]

Originally Posted by piper6909

Sorry, I don't mean to split hairs with you but an engine with "updated parts" is not "an engine that matches what the car originally came with." I would imagine that the engine block's casting or milling has to be different in order for the oversized bearing to fit. So, no, it doesn't match what the car came with.

I only mentioned it so if the OP someday decides to service the IMSB they will know NOT to rely on what the car originally came with, as I did.

The OEM's are required by law to include ALL updates in reman engines, particularly if the replacement is a waranty issue, and/or if there is a liability issue involving the update components; so with the exception of the updates, it otherwise replicates the original engine. The object is to keep the warranty recepient "whole", and prevent any known possible failure issues.

As for which AT engines carry the oversized IMS bearing, the AT serial number can be decoded to determine its date of remanufacture; so AT's prior to PCNA switching to the oversized bearings would contain exactly what bearing the original engine carried; those producted after the change over date would carry the larger bearing. And just to address your point of contention, the engine cases carrying carrying the oversized bearing are EXACTLY the same as the original, only the IMS shaft was changed to allow the use of the large IMS bearing.