jackndabox

Quoting from an article at "http://www.dieselpowermag.com/news/0707dp_1973_maxidyne_300_series_mack_engine/index.html". "The Mack Advantage In 1966, the company was suffering from a lack of capital, but the new Maxidyne ENDT-675 diesel series was introduced with great fanfare. This novel engine produced 237 hp with peak torque at 1,200 rpm and delivered a usable powerband up to 2,100 rpm. This was a huge innovation because Mack offered a mill with a 52 percent torque rise (torque rise is peak torque divided by torque at rated horsepower). No big deal, you say? Consider the competition offerings of a mere 20 percent, and today's versions have an average of 35 percent. Mack engineering provided the low-end grunt by tweaking the mill's internals, modifying the fuel system, and playing with the turbo pressure. Mack capitalized on its engine's brute-force advantage by producing a five-speed triple countershaft Maxitorque transmission. The idea was intended to make the driver's job easier (less shifting), compared with the competition's 10-13-speed transmissions. This meant a Mack truck traveling at 50 mph in Fifth gear with a heavy load could climb a 6 percent grade with the driver downshifting only one gear. In Fourth gear, the Maxidyne (Maxis) engine could maintain 1,700 rpm, and the truck would crest the grade at 20-25 mph. Maxis were highly regarded in over-the-road, dump-truck, and mixer applications, where low speeds were common and constant shifting was a pain. In 1973, an intercooled ENDT 676 Maxidyne-series engine was introduced. This new unit featured 1,080 lb-ft of torque with 285 hp.". Is the 5 speed Maxitorque transmission mentioned in this article different from the main Box associated with the Quadraplex. The reason I am asking, the article seams to lead one to believe just the 5 speed was all that was needed.

Hello All I am looking to buy a R model. Always have liked Macks but never had the money to buy one, but now I do. Can spend about 5k. In regard to the 5+4 transmission. Is it possible to shift the 5+4 as only a 5 speed. Are all the 5+4 made by Mack. I really want a truck that is ALL Mack. Thanks