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Tractor Talk Discussion Forum

GMC Dump Truck

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Tweeter

03-29-2008 13:42:58




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What brand or make automatic transmissions were used in the late "80"s GMC/Chevy 6000/7000 series dump trucks? I am thinking Allison, maybe?




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Blackhole49

03-30-2008 05:49:12




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 Re: GMC Dump Truck in reply to Tweeter, 03-29-2008 13:42:58  
I work for a municipality. We've been running that size dump for all our work since the late 70's both gas and diesel. They have all had the allison auto. Never had a mechanical problem with the trans. On our 96 ford 8000, we have had to replace the trans computer twice (allison world) but the trans has been bullet proof. As a side note, the late 70's trucks had 427 gas engines. Gobs of power but hard on fuel. The 80's trucks had the 8.something 4 stroke GM diesel. Gutless but good on fuel. The 90's trucks are all 6 cyl. cats. Not as much power as the gas, but close and good on fuel. When were doing snow with the front plow , underbody plow and a load of salt, we work the snot out of the trans. This year we will start replacing the 90's trucks. Other than rust, a ten year old municipal dump (ours are 5-7yd) for a small community sells for $3-4000 and only has about 60,000 miles on it.

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Bob Huntress

03-29-2008 21:09:46




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 Re: GMC Dump Truck in reply to Tweeter, 03-29-2008 13:42:58  
When you purchase a medium duty truck, it's different than buying a car. Except that Mack Engines were only sold on Mack Trucks, you can have any engine and transmission you want come with your truck.



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Walt davies

03-29-2008 15:05:38




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 Re: GMC Dump Truck in reply to Tweeter, 03-29-2008 13:42:58  
Most of the big GMCs that had were Allison a real piece of junk in my opinion after pulling them out or repair till I was sick of seeing them.
Walt



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Tweeter

03-29-2008 15:30:52




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 Re: GMC Dump Truck in reply to Walt davies, 03-29-2008 15:05:38  
Walt, Are you saying the Allison trannys are junk or just the ones in those years trucks?



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phillip d

03-29-2008 16:00:16




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 Re: GMC Dump Truck in reply to Tweeter, 03-29-2008 15:30:52  
There are lots of them up here and most people like the automatics.They are mostly 5 speeds,I have heard that if you shift it from bulldog to second without stopping,while under load,they are at risk of smashing all apart,so if you get one,make sure you stop to shift it out of 1st.pd.



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