| [GMCnet] Tid Bit. Getting to the top of the mountain. And not over load the engine or transmission. [message #340407] |
Sun, 27 January 2019 11:26  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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Think of it this way. You have a 10 speed bike. You shift to a lower ratio. So that it takes less effort for you. The bikes engine. To get down the road. Or up that hill. Thus you. The bikes engine will run cooler. And not be so tired at the top of the hill. The 3:70 FD is an outstanding improvement to any GMC. Towing or not. Mileage goes up because your running a higher intake vacuum. Less load on pistons/bearings. And the water pump is getting more water to the radiator. The same situation for the transmission. Runs cooler with less load. More fluid to the trans cooler. If your running a power drive chain in the transmission. The trans will not get the less load/heat reductions that the 3:70 FD offers. And finally as to transmission loading on steep climbs. NEVER use more then half throttle. NEVER. And except the speed you get.
There is a very old thought that running an engine at higher RPM's is hard on your engine. That idea died in the mid 50's. When compression ratio's went up. Piston technology made great strides. Aluminum pistons were replacing the heavy cast iron ones of the day. Engine lubrication system were greatly improved. Pulling a heavy load like are GMC's at low RPM's. Puts more load on the engine pistons, and bearings. Reduce the load/heat on your engine, and trans. Don't be overly concerned about running the RPM's to the 4000, to 4500 point. I've been in the mountains with a GVW of 17,000 lbs. That's the weight on one and a half GMC's. Using a perfectly stock 403. No headers, no 3 inch exhaust, and no extras engine venting. Bob Dunahugh
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