Tri Axle loads and gear ratio

No that ring is just as off set. Transmission has nothing to do with it as far as positioning or how much off set the carrier has.


I get what evidence saying about a deeper low gear to get start ability up. But where that tire meets the grotto get the initial turn is hard on it. Think of it as 4:1 or 10:1 the high ratio takes more “twist” why do you think they made the driveshafts so much bigger? Now once rolling even slow your fine

 

I was replying to the post above mine saying the high ratios just don’t work and referencing a 110mph truck across the desert but I forgot to quote him.

 

The only jumping and hopping trucks I’ve ever seen are pieces of garbage with trashed clutches and worn out engine and trans mounts. I’ve been in automatic Volvos and PACCARs, the last 7yrs, and never experienced jumping and hopping. Likewise, I’ve never seen/heard of a rearend failure in a fleet as big as 2000 trucks. All this talk about stress on the driveline is hypothetical, just like the new <1000rpm engines will destroy their rotating assemblies. It just doesn’t happen.

The biggest differences in making these tall rearends work is the right spec and right brand. Volvo’s “crawler” 13sp I-Shift simply can’t be beat. They have absolutely nailed the engine-to-transmission interface. This system operates like butter. And, the spec offers the absolute best fuel economy of anything on the road.

 

Off road I will agree but anything else with a 2.64 in a I shift will be fine. That is why you have 1-3 gears. They have great start ability until you get to the 2.43 and higher. That is when you need to add the crawler gears for 13-14 speed. The problems you will have is in the parameters being correct so you do not kill the clutch and trans.

 

You are right on the older trucks. But in a newer auto like IShift you would be wrong. With the correct spec you can use 3 gears UD, DD, and OD and all will be within a few percent difference depending on weight of load and terrain. The transmission is not the only thing causing the parasitic drag as the engine plays a role in this as well.

 

Take the 2.64 if I shift. That 3.08 will have emission issues.

 

Getting yourself rolling is what is hard with the 2.74 gearing in my truck it took me awhile to get used to the "grabbiness" of the gears when you are heavy and just trying to start her moving add a little hill and soft ground and one little slip with the clutch pedal and your liable to start breaking crap. Once rolling even just a little tiny bit it acts like any other truck I have driven

 

I'am throw'n down the BS card on about 90% of what you posted you mean to tell us 100% of the fleets with 2000 truck not a single 1 has had a rear end failure or a driveline failure ? Nor 1 single drive shaft or U joint .. ?? ? .. you know this for a fact ?????? can you offer proof ???.. and you mean to tell me the only time a truck jumps or hops is when the motor mounts are worn out ? ..and you seem to think that a auto trans is the only way to go ?
I have my doubts you actual know the difference between a drive shaft and a axle .. or pinion shaft

 

You’re quite full of yourself, eh? You might be surprised at what I DO know and have worked on and rebuilt. Being pro-automatic doesn’t make all of us “just” steering wheel holders.

I spent a lot of time hanging around the HQ shop, when I was in that DC. In general conversations with the techs and tractor fleet manager, no mention of stuff simply breaking, as you have implied. Yes. There was replacement of wear items, but, not outright carnage, as you seem to think. The vast majority of issues were emissions-related and wear item replacement and the most common large job was X15 top ends. When a fleet hires decent, experienced drivers, abuse of equipment generally isn’t a problem.

You ask for proof. Yet, you know I don’t have access to a fleet’s records. If the fleet manager tells me “We have had zero breakage” of a certain component, that’ll never be hard proof to you and you’d still use that against me. Even it was wear items, like pinion bearings and seal, you’d attribute that to being a tall rearend with an automatic in front of it. You just gotta’ win the argument against something you despise. Next, you’re going to tell me I’m not a real trucker.

 

Doug Andrus specs 12 speeds with 3.08’s on their 4 axle trucks that gross 105k running the mountains and I would think if the trucks were getting destroyed they would stop doing it. But they still are.