eaton 10 speed and synchros

I would imagine that it would be very expensive to make a Sync for a transmission so large that would be under a huge load. Wouldn't it take up space and add weight, too?

 

There is a reason truck transmissions don't have syncros in them, The stress would tear them apart. That is also the reason learning to shift a truck takes time.

 

Not at all, the strongest gearboxes are synchro , eaton transmissions arent even an option on European high hp trucks anymore cos they aren't strong enough, Scania offers their regular synchro box on a 730hp @3500 nm torque tractor rated at 180 tonnes (about 400,000 lbs) and have a 4 year warranty,

Synhcros have a bad name here in NA. Largely cos of early models back in the 60's and 70's, in fact I had my driving instructor here in Canada tell me synchros "only last 300,000 kms", nothing could be further from the truth. They are stronger and do last longer however like already stated they are a bit heavier but more compact than you'd think

I don't understand why they don't sell here, Volvo tried to sell them here but sold hardly any, they are so easy use and are a big help in offroad operations- gearchanges are faster, more precise and you can select any gear you want and they eliminate problems especially for newbies on hills, other things I like is the faster progression through the gears from take off, normally a fully freighted truck will go from standing to 60 mph in 4-5 shifts and yes- you can float them

 

Here we go again I guess the reason we don't have synchronizers over here in our class 8 trucks is because we are smart enough to shift gears without synchros. Where you get that you can float a synchro trans is more than I can figure out. If you don't hit the gear perfectly you're damaging the synchro's now it may be different on that crap ya'll have across the pond but over here it'll tear the synchros up not good. I wouldn't trust a synchronized transmission in a class 8. The one on my dodge has 215k on it and it's shot...unless it's the clutch but that's got 215k on it so of course the clutch is wore out. Besides that how many truck drivers on the road leave their hand on the shifter when they drive? Quite a few of you know that puts pressure on your synchronizers (so I've been told have yet to see proof) and causes more rapid wear. Now if that is true think about how fast you could wear out a set of synchronizers if a drivers hand sat on that shifter 11 hours a day for 600 miles every day and think of the cost. unsynchronized transmissions aren't broke so don't fix them:smt115. I would suspect that that is why we don't have synchronized transmissions over here.:smt115

 

really I sugest it is possible to fit synchro from European Fuller tranny, but you have to install clutch servo becouse it is hard to do clutching every time you shift.

 

Nah , if the truck is in gear you can't damage the synchros by resting your hand on the shifter - it's in gear! yes you can float no problem just keep the revs up just like an eaton which by the way I can manage just fine. The idea of the synchro's is you don't have to hit the gear perfectly that's why it's called 'synchromesh' often floated gears and I usually sold my trucks with everything from 200,000 - 2,500,000 on the clock and I've never had a failure and never had work done on a gearbox except ZF boxes which are just crap anyway, amazing the amount of misinformation out there ! I'm not saying eaton is a bad box by any means, I know they are good, I use them every day, I even like it but synchro technology has moved on, they guy asked about them I'm simply answering as I have years of experience with them and I can compare them, comparing a class 8 box to that in a pickup is really silly, and this 'if it ain't broken' thing - America has a serious problem with this, America has resisted change so long and fallen so far behind, take the emissions crap, I know euro trucks had problems at first too but not on the same scale as here and all these problems are mostly dealt with cos this stuff was developed over time, also take mechanics here in NA, back in Europe they grew up and trained with modern engines and electronics and what are considered small problems at home means multiple and long expensive trips to the shop here sometimes without being fixed, I've seen this happen myself with the company I'm working for here, Legislation is now making trucks move on, so for manufacturers here with no money spent on development what now? It spelt the end for CAT and these modern engines are not reliable- not like cat and cummins from ooh lets say 10 years ago, those were proper engines!

So once again I never said eaton were bad, they are great boxes just synchros are easier to use and nowadays alot stronger

 

If you can change gears quicker in a synchro box than a roadranger there is
something wrong with the way you shift the eaton. Every synchro box I have driven in a truck I have had to wait years between changes to get the gear.

I thought you could only get opticruise with the 730hp Scania. Well over you can't get the full manual.

 

Over here they'll put autos in the trucks before they put syncros in the trans. I've driven autos, I don't like em. Less than 2 weeks on my own I hardly never use the clutch except to get moving. I'm still grinding a little on my down shifting but I'll get it. My understanding is syncros in the big trucks wont last. And with all the new guys coming to this industry, It makes cense to keep it simple. However more and more trucks are being built with autos because anyone can drive them. Autos are also becoming more reliable and efficient.

 

Yeah that's true but opticruise is a synchro box just has electric change

I can shift the eaton fine still find a synchro faster and better in deep mud or in very tricky conditions, it's far more forgiving