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The original engine was governed to 3000 RPM under load. You need an engine that will run at least 2500 to 2600 to keep a usefull range of ground speeds. Some Cummins dealers retrofitted "C" series engines in to the 145's, and the "B" series (same family as the "GOAT" truck engines) should do a respectable job, too. Also, eliminating the top transmission shaft and it's associated reduction, and turning the second tranny shaft end-for-end, and flipping both the front and the rear differentials will allow the use of a large diesel, such as the Cummins 14 litre to be intalled, and run at about 1800 RPM's. I've done that. Using that big, long diesel will require a plate with a seal installed to be added to the front of the transmission, and a section of frame rail from a "donor" tractor to be added to make room for the longer engine, but the results are SPECTACULAR, in power and fuel economy, not to mention engine life.. Another alternative, if you're using a slower speed, 6-cylinder diesel, is to obtain and install a transmission from a "800" or larger tractor that will be geared to accomodate the slower-turning engine.
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