Back in the day,late '67/'68 when Mack changed body styles from the "B" models to the R,U and DMs we bought a couple of new DM800s with 12cy Jeager mixers on them and I got one new.We could not get the Maxidyne yet so they had the 250/Quadruplexes in them.Those were a sweet transmission to shift and they had 4 grease fittings on the shift rails on top of the transmission case that helped keep everything smooth.
Now,sound........In the spring we got two or three more DM800s with the new Maxidyne,talk about a hot rod,just the sound with that straight pipe,the blower had a tag on it that proclaimed "silencing device".I finally got one myself,a handmedown but the bark of that engine was pure joy.When you dumped the throttle during a hard pull the blower would unload back through the air cleaner,what a sound.
There was a learning curve that went with it too,those high torque rise engines lugging down and just kept on pulling.The low limit was now 1200 rpm and we had been taught over all these years that 1500 was time to shift but that 237 just kept on pulling.And barking,who could run with the right window closed?
They came through with three different transmission configurations,the 5 speed with deep under in the auxillary,then the next one had the overdrive in the auxilliary an finally the one I liked the best with reverse,under and over in the auxilliary.I found that the Maxidyne liked the low rpms the best,that was when it was getting the most fuel and was running the hottest........and sounding the best...lol.On a dead pull,and I have tried this more than once,the 250 would outpull the 237 by just a scoche,I mean you could see what 13 horsepower was doing but ,man,what a lot of work to get there and that Gold Bulldog just had 5 speeds to row.Ron G