I shift transmissions

it is pretty hard to compare ishift with fully automatic ,

anyway i look at these videos , and i hate american way of advertising it is really funny instead of showing positive things of your product they are showing how bad is competition and of course they try always to lie to show competition even worse

of couse allison must be better in this starting and it will not roll back and other things but dont believe that ultrashift would have problems in that , if really would than it is crap and not even close comparable to ishift

we are doing excavations of gravel, weight is about double than on truck in video it is steeper i think about 30-35% and you mostly start in 2nd low gear , and ramp is soft truck often sink to axles (front straight axle rear hub reduction so better ground clearance) and there is no problem with clutch so automatic could do that very easy

where you would have problems are inclines of 50%

here many operators who used automatics are going on dry clutch because it is cheaper to replace few sets during lifetime of truck than have disadvantages of automatic

local heavy haulage company switch from torque converter gearbox to ishift and put 750hp engine , they pull 8lines of scheuerle modular behind 8x4 tractor and put 400 000lbs gross

only thing i dont like on ishift is small overall ratio they are simply too fast in bottom gear

 

Well, I am sure that no one transmission is going to fit every situation, every day, all the time. And I have no intentions of taking a truck up a wall of the grand canyon. I made mention I would seriously consider it for what I am doing, which is general freight, mostly highway. I do have to run quite a few two lanes that have some interesting grades and curves at the bottom, that an auto would be a work saver. And since the full auto is more proven and reliable than the auto shifts, I would consider it. The poor mpg associated with full autos was the only hindrance. But with the TC10, Allison has crossed that bridge and now has a real contender to the auto shifts. There is a serious point that can be made that doing full power shifts are more efficient than float style that is associated with standard transmissions, be they manual or auto shift. And a full auto can be easier on the entire drivetrain in the long run. The risks of being down because the unit would not shift is lessened with an Allison full auto compared to a electronically shifted manual transmission.

And why wouldn't one compare to the competition? That is how most things have been done since the dawn of time. Politics takes it to a major level though.

 

i dont know from my point of view using automatic is ridiculous

here AMT transmission market share is above 95% dont remember when i last time saw new truck with manual

and since our roads are not just straight but there are some very challenging roads weight is higher and engines weaker so this require lot more gearchanges and put lot more on gearbox there is no problem with them

i dont know how good or bad are eaton amt, but mercedes or volvo is very good and it is hard to find any bad sides

only onroad situation where modern automatic is not fully able to shift better or same as you is when you climb on some mountain passes taking serpentines , than gearbox incline sensor can make wrong decision on volvo you simply use hold function or set gear manually

 

I would agree automatics ridiculous in my book also, if talking about auto shifts. Full automatics? Another story altogether.

 

Cowpie , the I-Shift is really not unproven.
It it really really good.
Way ahead of the ultra-shift.
Cant even compare it to the old Allison as they are worlds apart.
The new Allison is a bit of an unknown but I am interested to see.

 

Well, I may have gone over the edge on saying unproven. Allison has been at this game a lot longer than the other folks when it comes to automatics. Full autos from Allison have been around a lot longer than autoshifts from anyone. I was playing with Allison automatics in end dumps in Alaska in the 80's. Autoshifts weren't even on someone's mind, let alone on the drawing board at that time.

 

I have driven an Eaton Ultra Shift and disliked it because of the rollback technology. I am a big fan of allision transmissions for the reasons cowpie mentioned and would like to see how an allision compares to a I-Shift.

KH

 

This will be interesting.
Im not sure what the Allison TC-10's target market is.
Sure they will sell to anyone with money , but where is it that they hope/expect their product will be competitive.
We know the new duel clutch I-Shift (I-Drive) is aimed at OTR.
Allison historically has always been strong at stop start and/or very heavy type operations.
It seems they are now looking at getting in to mainstream OTR.

Two very different approaches the I-Drive and TC-10.
One makes use of a wide torque band on the motor and a torque convertor.
The other takes advantage of a very narrow but very frugal torque band using duel clutches to keep power uninterrupted with frequent gear change.
It seems like the simple vs the sophisticated to me.
If the I-Drive is as reliable as the I-Shift and not to expensive then it will be a winner I'm sure.
If the TC-10 has overcome some of the issues (Hunting , overheating etc) the older units had when used on OTR and it also has no mpg penalty then also a winner.

 

would be interesting to see how clutch would handle ishift2 , or however they will call it , ( i see different confusing names)

but if i am right one clutch is always open ,and it use sliding mechanisam to chose between mainshaft and countershafts

so i wonder if one clutch is always open and in 90% of time you drive in last gear ....so it is clear which clutch i think..... how pressure plate cylinder and bearing would handle this

also interesting to see torque to power ratio (2800/460)

 

I tell you I'm not buying the first one.
If I was in the type of business where I changed my trucks every few years with buy back guarantee and replacement trucks were given when trucks were down I would consider it.
As I tend to keep my trucks for many years and maintain them in house I will wait and see how they work out.