Can the Aisin be reprogrammed?

[Cattletrkr]

My truck thinks it has about 800hp and it needs to shift at 2000rpm... even when grossing 37K. It can't handle it. Can that be changed?

If I stick my foot to the floor it'll run it up higher but I don't want to have to floor it to get going all the time. I'd rather be nice to it. Even on what I consider to be a harder than normal acceleration, it wants to shift at 2000rpm.

 

[dquaney]

Cattletrkr



When I talked to the guys at Smarty they were not very optimistic about cracking into the Aisin computer. They did sound like at sometime they may try it but not anytime soon.



How does your pickup handle pulling that 37k and what kind of mileage have you been getting.

 

[Cattletrkr]

Very limited use so far, only two loads. Not as much power as the '04. 5 but the Smarty may have had something to do with that. Decent for a stock truck, but I doubt I'll be able to put up with it for long.

The Aisin... NEVER AGAIN!!!!! Call it buyers remorse or whatever, I hate that POS. Shifts WAYYYY too soon. It shifts early, skips gears and today it damn near killed the engine shifting too soon once. I refuse to drive with my foot on the floor all the time but that's the only time it works right. For now I shift thru each gear and cuss when I forget.

I wonder if more power would fix the problem...

10mpg on the first load, 9. 5 today. That's not too far below what the '04. 5 was getting, maybe 0. 5mpg less. For a truck with only 1200 on the odo, I'm happy.

Thought... . is there supposed to be some sort of "fluid coupling". Except for 2nd gear, mine goes into lockup probably 95% of the time.

 

[dquaney]

Personally I like that lockup because when I pull those hills and it shifts it only goes to 2500 RPMs instead of unlocking and going to 3000. I like to ease into it too mainly because of 4. 25 fuel but mine seems to do fine with shifts.

 

[jelag]

We have a 5500 and the Aisin... . the driver tells me he's very happy with the shift points and performance at 20K GVW...

 

[Cattletrkr]

Maybe there's something wrong with mine. Some of the time when it shifts too soon it won't downshift no matter how hard I try to push thru the floorboard. This thing is constantly shifting when below freeway speeds. Maybe it's still "learning" I dunno.

I like the lockup to stay once it's in gear, but when it shift and drops 5-600 rpm, down to 1300-1500, that's just too much at once. My '04. 5 with the NV5600 and 4. 10's powered by a Smarty on 60hp wouldn't handle this trailer at that rpm too well either.

It will do this empty (no trailer/load) as well as loaded. Obviously when it's empty it's no problem, just annoying.

 

[jelag]

I've only driven ours for maybe 100 miles... the rest has been by one of our drivers... the truck now has close to 15K miles. .

 

[RVTRKN]

I'm not knocking the Aisin trans for Cattletrkr sakes, but his issues are the reason I bought my C&C with the G56. I shift it when I want the gear I want, and is why I don't like any auto behind a Diesel. The programing of an auto will also detune the engine on the fly to protect itself from the massive torque these engines produce. I like shifting on grades myself when I feel the need to down shift or upshift. The negative of the Aisin is you can not shift through gears individually like the allison or the 68rfe and was why I didn't get it in mine. when I test drove it, I thought the overdrive and tow-haul mode was not setup correctly and this was on a test drive with no load and even no bed on it.



Steve...

 

[Cattletrkr]

when I test drove it, I thought the overdrive and tow-haul mode was not setup correctly and this was on a test drive with no load and even no bed on it.

That's what I thought as well when I test drove one. Silly me, I thought with a load behind it would shift differently like every other auto.

The main reasonI bought the Aisin was for the 180K warranty. The G56 doesn't come with any ratio faster than 4. 10 does it? That wouldn't work for me either.

 

[RVTRKN]

I like the 3:73 gear, as it is a good compromise between the 3:55 and the 4:10. I would be looking for 8th gear then, instead of 7th:-laf if I were to go higher than a 4:10. I am very pleased with the way it is.

 

[Cattletrkr]

I like the 3:73 gear, as it is a good compromise between the 3:55 and the 4:10. I would be looking for 8th gear then, instead of 7th:-laf if I were to go higher than a 4:10. I am very pleased with the way it is.

How did I manage to screw that up? I didn't know the 3. 73 was available in the C+C.

#$^@#&$&#$^#$&%^#$$:-laf

 

[RVTRKN]

You must have bought what was in stock, or did you order it that way? The fleet manager asked me if I wanted the 4:10 because the C&C comes standard with the 3:73 and G56, If you wanted the 4:10 you have to order it as an option.



Steve...

 

[Cattletrkr]

Yes I took one from stock, but I've been researching these things since they came out. Maybe they changed it for '08 or something.

Oh well. What's done is done.

EDIT: Nevermind. I see you have an '07 too.

 

[Cattletrkr]

I just went to Dodge's build page. Looks like the 3. 73 isn't available with the Aisin. That's probably where I got confused.

 

[HBarlow]

My Aisin works great at a combined weight of about 24,500# pulling my own 5er. I use the tow/haul mode all the time when loaded unless I want to run over 60 mph on fairly level ground using 6thOD.



Shift point rpms depend upon load and throttle setting. It will hold gears longer to higher rpms if I call for it with throttle foot.



I can control the gear selected by using the shift lever to select 1, 2, 3, or 4. OD lockout selects 4th, tow/haul allows 5th, and regular drive will upshift to 6th.



It is true that the driver never has total control like with a manual clutch and transmission but I am well satisfied with the Aisin.

 

[Cattletrkr]

I don't really have much middle ground. It's either 2K or 3K... more or less. I have the problem with my empty trailer, about 6500lbs, as well as loaded. I don't think it's because I'm too heavy.

I know I can go thru the gears one at a time, and I do, but that's not really the point of having an auto.

 

[HBarlow]

I don't really have much middle ground. It's either 2K or 3K... more or less. I have the problem with my empty trailer, about 6500lbs, as well as loaded. I don't think it's because I'm too heavy.



I know I can go thru the gears one at a time, and I do, but that's not really the point of having an auto.

Cattletrkr,



I don't understand why your's would behave so differently than mine. Have you driven any other Aisin-equipped Rams? Maybe there is something not quite right with your truck causing it to shift strange. You might try disconnecting the battery ground leads and leave them off for 15 minutes or so to allow the ECM and Aisin computers to reset then reconnect and try again.



Mine works great shifting itself normally in Drive or Tow/Haul loaded or unloaded.

 

[EB]

I can't complain about the Aisin transmission, it does everything I've expected it to do plus making driving in heavy traffic almost a pleasure. I normally have a trailer behind me that weighs 9700 lbs empty, loads will go up to 15,000 lbs on the trailer, sometimes more. I will agree with RVTRKN that the overdrive and tow-haul mode could have been set up differently and it would have been better. The way I usually do it when I'm loaded is to start out in tow-haul, as soon as the transmission shifts into third or sometimes forth, I'll hit the button to put the transmission into overdrive off. From there you can run the rpm up to what ever you want to and then push the button again and it will shift through the last two gears and it seems to pull really well up to highway speed. Doing it that way is just a habit with me now, I don't even think about it, I just do it that way. If I'm not loaded or don't have the trailer behind me I just let the transmission do its thing. Works good for me.

 

[Cattletrkr]

Tow/Haul does nothing for the shift points. Shifts identical to not having the button pushed... except 6th is locked out.

If it would shift at 2500 or so loaded that'd be good enough for most instances. There's been a couple times when it shifts at 1900 or so going uphill loaded. That's when it shakes and almost dies cause it can't pull the load. I'm going to the dealer tomorrow for my fuel tank (finally) so I plan on hitting them up about it.

 

[HBarlow]

Tow/Haul does nothing for the shift points. Shifts identical to not having the button pushed... except 6th is locked out.



If it would shift at 2500 or so loaded that'd be good enough for most instances. There's been a couple times when it shifts at 1900 or so going uphill loaded. That's when it shakes and almost dies cause it can't pull the load. I'm going to the dealer tomorrow for my fuel tank (finally) so I plan on hitting them up about it.

Something is not right with yours. The Tow/Haul mode completely modifies operating characteristics of my truck. If I select Tow/Haul mode shift points are extended to higher rpms in each gear and shifts are much firmer. Similarly, when decelerating in Tow/Haul it downshifts earlier at higher rpms and holds the exhaust brake engaged down to 20 mph in, I think, 3rd gear.



Afterthought on edit: Are you sure your exhaust brake is activated? If I turn off the exhaust brake Tow/Haul mode is effected also.