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I am looking at some M936 wreckers. Is it worth it to spend a few thousand more to get a M936A2 with a Cummins 6CTA8.3 504 cubic inches (8.3 L) turbocharged inline 6 cylinder diesel engine? Would I notice a big difference on the highway? Any reason(s) to avoid the NHC 250 in comparison...

I am considering switching over to a 12V system in my 1980 M920 since I do not have any 24v trailers and may need a new starter and alternator. Will this starter work: Delco Remy 8200287 39MT 12V ? I saw some older posts where people have converted to 12V in the M920. I have asked about...

...long post...lots of details...50 yr old rookie here... As I was connecting the batteries on my M920 today, it sounded like the starter began spinning even though the ignition was off and the key was not even in the truck. It was only spinning and not engaging. It was a constant humming...

Is there a manual tachometer that operates based on the spinning of the internal portion of its cable and requires NO 12v or 24v power source? 1980 M920 Cummins NTC400 - speedo/tacho not working; truck starts and runs for 20 seconds then quits. Would be interested to the know the RPMs at all...