mowerman Posted November 26, 2023 Share Posted November 26, 2023 Yes, pulling hills. You cannot shift it up or down. Next truck I got was a 350 Thermadyne nine speed. It was a lot easier to deal with.bob Quote Link to comment Share on other sites More sharing options...
Popular Post tjc transport Posted November 26, 2023 Popular Post Share Posted November 26, 2023 back when i ran the "mud stick" if i had a heavy load on an uphill start, i would do 1-2-3 low then 2-3-4-5 high the split from 3 low to 2 high would give me a little more than a half gear to get some speed going. i did this mostly with the low boy which had a 237 and mud stick in that 79 DM-800. truck has a top speed of 52 MPH it also had 14-24 tires on it. tandem tractor and three axle trailer. but anything over around 40 MPH was scary being 10.5 foot wide with a 25 foot long deck i was legal for around 215,000 lbs. truck empty weighed 78,000 lbs. with a machine on i would very rarely go over 25 mph. mostly hauled a 135 cat excavator and D8H or D8-K with that rig. 2 2 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
Joey Mack Posted November 26, 2023 Share Posted November 26, 2023 I wish I could drive that rig.. Sounds like a bunch of skill... I guess today, the driver just pushes his right foot closer to the floor... 1 Quote Link to comment Share on other sites More sharing options...
B MACK Posted November 27, 2023 Share Posted November 27, 2023 I will give my 2 pennies worth also. I had/ still have a 1982 ( bought new in 84) Superliner with a Spicer direct 5 speed main box and a 1241 four speed behid it. So Mack did put Spicer boxes in. It might have been a special order, that's why it sat on the lot for 2 years. With two transmissions and originally 511 rear ends, and the rear ends were Rockwells. Mack has or has had some different transmissions. I ran a dump truck with a mack 12 speed. I liked that trany . Two whole gears in each slot you put the stick in. Really deep lo . And 5 or was there 6 reverse ? Quote Link to comment Share on other sites More sharing options...
terry Posted November 27, 2023 Share Posted November 27, 2023 Counting the lolo in reverse, should be six. Terry Quote Link to comment Share on other sites More sharing options...
Popular Post tjc transport Posted November 27, 2023 Popular Post Share Posted November 27, 2023 Yup, 6 reverse. Really freaks dump spotters out to see a dump truck coming at them 45 mph in reverse. 1 2 Quote when you are up to your armpits in alligators, it is hard to remember you only came in to drain the swamp.. Link to comment Share on other sites More sharing options...
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