I drive a Freightliner Cascadia. When my trainer trained me on a Freightliner Cascadia four years ago, my trainer told me that to downshift, I must clutch the transmission out of gear, and then rev the engine up 400 more RPM's than the RPM level was when I clutched the transmission out of gear. Then I must clutch the transmission back into gear to complete the downshift. When I do all downshifts except for 6th gear to 5th gear, I am able to almost always successfully downshift using the method that my trainer taught me. However, when I am attempting to downshift from 6th gear to 5th gear and I rev up the RPM's 400 more RPM's than the level of RPM's when I clutched the transmission out of 6th gear, the transmission grinds when I attempt to clutch the transmission into 5th gear, and the transmission won't go into 5th gear.
However, when I clutch the transmission out of 6th gear and I rev the RPM's up 500 more RPM's than the level of RPM's when I clutched the transmission out of 6th gear, I almost always successfully downshift from 6th gear to 5th gear.
Why do I have to rev the RPM's up 500 more than the RPMs when I clutched it out of gear to successfully downshift from 6th to 5th when I only have to rev the RPMs up 400 on any other downshifts?
Downshifting from sixth gear to fifth gear
Discussion in 'Experienced Truckers' Advice' started by expedite_it, Jan 6, 2017.
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Whoa!!!! Mind blown! Is shifting really that hard? I'm not trying to be a smart arse, I just never realized it was that complicated. I just do it and it happens. I couldn't imagine thinking about it that much. I'd literally melt
RollingRecaps, Macneil, Dominick253 and 10 others Thank this. -
You are moving the hi range button down to low range before moving gear shifter out of gear, if so the trans has a larger step down to 5th gear you must remember to rev. it up a little extra to make it shift like a pro?
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Easy answer is: No 2 trucks are the same. Just because both truck are the same model, doesn't mean they're both spec'd identical. I wouldn't read too much into it.
RollingRecaps, Bean Jr., Crusader66 and 3 others Thank this. -
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What all these guys said. And you have a little further distance to travel making that shift, so you need the extra revs so its in the correct range when you get there.
Crusader66 and Lepton1 Thank this. -
I can't imagine trying to watch the tach to get just the right rpm. I guess maybe I forgot what it was like to be new. Just pull the stick out and give the fuel a little light tap maybe two and it'll slide right in. If you tach a little high you'll catch it on the way back down. As peasy as it is easy.
Grubby, Keithdabarber, MayhemTrucking and 6 others Thank this. -
RollingRecaps, Crusader66, Dumdriver and 1 other person Thank this.
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Dumdriver, i dont find my question to be that complicated. But i will simplify it for you: for all downshifts other than 6th to 5th, i only have to rev the engine up 400 rpm's. Why do i have to rev the engine up 500 rpm's to downshift from 6th to 5th?
JReding Thanks this. -
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