Katahdin
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I found some relevant information in the attached lubricant fleet study, there's nothing I think this thread has missed, but it does document the differences in a nice little summary. There might be other details of interest in the study of wear on the various engine components in the report.
"5-Ton M54A2 Trucks - The LDS-465-1A engines are the turbocharged version of the 478-cu in. displacement, multifuel engine used in the 2-1/2-ton M35A2, and those involved in this program were built prior to the introduction of the derating modifications. In addition to the turbocharger, major items included in the LDS version are different pistons with an oil cooling annulus, changes in the delivery rate of the injector pump, different injectors, flywheel and flywheel housing, clutch, and inclusion of a power steering pump on the front timing gear cover."
"5-Ton M54A2 Trucks - The LDS-465-1A engines are the turbocharged version of the 478-cu in. displacement, multifuel engine used in the 2-1/2-ton M35A2, and those involved in this program were built prior to the introduction of the derating modifications. In addition to the turbocharger, major items included in the LDS version are different pistons with an oil cooling annulus, changes in the delivery rate of the injector pump, different injectors, flywheel and flywheel housing, clutch, and inclusion of a power steering pump on the front timing gear cover."
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