DRUMMER35501 Posted February 1, 2007 Share Posted February 1, 2007 I just purchased a b61 and was wondering if it would be wise to rebuild the old thermodyne engine or replace it. I understand a 300 will bolt up since we are looking at replacing the old duplex with a eaton 9 or 10 speed. What do you guys think and how much would I be looking at cost wise to rebuild the old thermodyne. How much trouble is it to swap out the engine and tranny? Any sheet medal modifications needed. Thanks guys! Quote Link to comment https://www.bigmacktrucks.com/topic/2090-b61-thermodyne/ Share on other sites More sharing options...
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