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2 stick 6 speed and stupid randyp


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I'm old enough to know more, but I have forgetful mind in my old age. I bought a real clean 80 r-model dump truck couple years ago, 2 stick 6 speed. A Mack mechanic at dealership told me to never ever do any thing other than when leaving pit, use first gear, low range, shift to high range on highway and just drive it like 5 speed. Well, bout the last month I been shifting 1,2,3 low, then go to high side after winding 3 low out, gear ratios are spaced closer like that, faster recovery time, less jet black smoke, and nary a scratch of any kind at all. I even downshift high to low sometimes on certain road conditions, no scratches at all. My question my friends, am I messing up? Doesn't seem to bother trans at all, and truck stays in a cleaner powerband. I think that dealership mechanic was full of doodoo,,what y'all think? randyp

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You're doin' fine Randy!!

REAL men don't follow directions anyway

Til we break it.

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 “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’


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i ran a 79 DM800 with 237 and a mud stick for 15 years and close to 750,000 miles shifting 123 in low, then 2345 in high when loaded. never broke anything, and still had the original clutch in it when the new truck came in in 95.

the dm also had the dynatard engine brake hooked up to a 2 speed rear switch on the main stick so i could pop it on/off between shifts to keep the rpms up.

Edited by tjc transport

when you are up to your armpits in alligators,

it is hard to remember you only came in to drain the swamp..

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Hi Randy, we worked a 6 speed for 18 years on heavy local work. We did over 600,000 miles (but huge hours) and in that time wore out 2 Maxidyne Motors and is now on its third Motor. We always did the123 then into high, as it was easier to get a smooth change at low speed that way. The truck is still going and still has all its original bearings except the rear output one. It is hard to make the first change from Low to High smoothly without grating, at very low speeds unless you are going down hill on a hard road, so I think that the smoother change far outweighs any other possibilities.-Just my thoughts - Kav.

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