Because you HAVE to double clutch a heavy truck transmission? That's the most hilarious load of BS I've heard in a while. Just because your boss prefers you to double clutch doesn't mean it's the only way to shift. I pulled unbaffled hydrochloric acid Super-B tankers (140,000 lbs gross) for a while, and gently floating the gears was the best way I found of controlling the slosh. When I sold my Western Star at 800,000 kilometers, the 18 speed transmission was still in mint condition, and the clutch was just starting to give out. Which didn't surprise me, after spending all its life lifting 140,000 lbs loads in often times soft ground, and absorbing the driveline surge of unbaffled liquid tankers.
The only truck I ever double clutched was an old Ford tandem with a 429 gas and 10 speed. That transmission just didn't like to shift any other way.
I personally don't care for autoshifts in heavy trucks. The Volvo I-Shift/Mack M-Drive is bearable, but the Eaton 18 Speed autoshift I ran was way too slow to shift and took forever to get up to speed. In soft conditions with a large load, the computer just can't keep up to what's happening and can't shift accordingly.
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Today's Featured Article - Restoration Story: 1929 McCormick-Deering 10-20 - by Randal Simmon. On July 4th 1998 my dad and I was sitting on the front porch when he said that he was going to sell his two 10-20's to a junk man. He said that the junk man was going to give him $500 for both of them but he hadn't received the money for them yet. So I went into the house and wrote him a check for $500 and bought them myself and said now they are mine. He had bought them about five years before thinking that he was going to restore them himself. After five years sitting in the barn, he changed h
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