Shifting
Mark
While it does ~definitely~ have appropriate applications - such as using the engine as a braking force to slow the truck - it also has long term effects that you need to be aware of.
#1 - It makes you engine wear faster.
Before you other guys start hollering; think about it. It's
definitely true. And it can be a geniunely significant factor depending on the driver's technique and the terrain.
#2 - Do the math; overhauling the brakes is really really cheaper than overhauling the engine.
~Generally speaking then~ forget downshifting and use the brake peddle. Your wallet will thank you in the long run . . . unless you live on a really big hill or something

P.S. If anyone says anything about 18 wheelers; remind them they can often go 300,000 miles hauling 80,000 pounds between inframe overhauls. It's kind of an ant hill to SKYSCRAPERS thing
Last edited by ctfuzzy; Oct 9, 2003 at 09:22 PM.
-Jim
Hey guys ;
Interesting topic you are all on! Well...When I was taking my lessons to obtain my CDL, I was thought that "You should not down-shift because you want to use your engine for braking; You are to use the brakes, this is their job!" Plus when a person is behind you and you downshift, you may create an accident, fishtail or both! These rules are good to know cause when bad weather is here this intensifies the accident ratio many-fold!Even the Rangers we drive; with there light cargo areas...fishtail galore!
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When I am coming to a....'normal' stop at a light, for instance, I will push in on the clutch, and use the brake to stop. However, if I am starting to slow down a long way back and still need some engine power to move along I will downshift to the appropriate gear based on the speed, so the engine doesn't lug.
However, If I am going down on a steep hill with a heavy load or towing a trailer I would use my engine to help brake. I also use the engine to help brake when slippery (snow or ice).
Does that sound right?
Digger
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I always use my brake to stop, and not downshift. Manual says not to downshift when stopping.
When I am coming to a....'normal' stop at a light, for instance, I will push in on the clutch, and use the brake to stop. However, if I am starting to slow down a long way back and still need some engine power to move along I will downshift to the appropriate gear based on the speed, so the engine doesn't lug.
However, If I am going down on a steep hill with a heavy load or towing a trailer I would use my engine to help brake. I also use the engine to help brake when slippery (snow or ice).
Does that sound right?
Digger
Ford Trucks for Ford Truck Enthusiasts
But seriously, if you do like to downshift be careful in the ice and snow. Downshifting to soon tends to lock up the wheels worse than a gentle foot on the brake and worst can send the rear sideways instead of just locking up.
Besides being a little harder on the engine, downshifting wears on the drivetrain if you aren't geting your engine up to the proper speed before throwing it into gear. That sudden surge(slowdown) when you first let up the clutch can be stressful on the truck.
Downshifting to soon tends to lock up the wheels worse than a gentle foot on the brake and worst can send the rear sideways instead of just locking up.
Another question that I have been wondering about. While stopped at a light are you supposed to put it in neutral and release the clutch, or can you just leave it in first (with clutch in o'course)? Are ya doin any harm to the clutch there?
OH! Another question: when do you guys usually shift? 3000rpms? Upshift that is.
Digger



