What does everyone think will happen when they change over to the vocational series transmissions in Jan '05? Will full power be available in all gears? Will the TC lock up in all five gears? Will there be a sixth gear?

Thanks.

Hey Big Blue, Welcome to the site! http://www.dieselplace.com/forum/smileys/Clap.gif


That's a great first post! Sounds like ya got sum edjermecation at that there schuol. http://www.dieselplace.com/forum/smileys/Big Smile.gif


Maybe one of the few that know will chime in or send word. I would like to know myself.





Burner------------> http://www.dieselplace.com/forum/smileys/Big Smile.gif

I'd imagine a sixth gear ,wish I had a sixth gear right now!


Welcome to the Place.


Mac Edited by: Mackin

its the same trans, just renamed. As for 6th gear.... I have heard its coming soonhttp://www.dieselplace.com/forum/smileys/Clap.gif

6th gear is there in our trannies, it just needs programming to make it work. One of my books for school shows what clutches are applied and hydraulic shcematics and such of what would be going on.

Seems to me like the web site listed some greatly improved HP and torque holding numbers for the Vocational Series?


Gona have to see if I can find that URL again...http://www.dieselplace.com/forum/smileys/Ermm.gif

Hi White Duramax,


I'm going to pull the stupid card, But did I understand you correctly in that 6th gear is already in our trans? Seems like somebody that could reprogram the computer and make up a switch to activate it could make some $$$ from that. Get rid of the speed limiter while there at it.

I believe it is a little more complicated than that. I will post more info soon.

its the same trans, just renamed. As for 6th gear.... I have heard its coming soonhttp://www.dieselplace.com/forum/smileys/Clap.gif


Can you give us a hint.. will it happen in the 05s??http://www.dieselplace.com/forum/smileys/Big Smile.gif

6th gear, clutches applied c2, c4, lockup; solenoids energized A,D,F;


C1 latch position- up; c2 latch position- down; converter flow valve position- up


Here is what it says:


Clutches C1 and C4 are applied. The application of C2 clutch locks the turbine shaft and the P2 pinion carrier., causing them to rotate as a unit. The P2 Planetary gearset provides the first range gearing in sixth range. The C4 clutch holds the P2 ring gear. With the P2 ring gear held and torque input to the P2 carrier, torque is transmitted to the P2 sun gear, which is splined to the mainshaft.


Second stage gearing in sixth range takes place in the P3 planetary gearset. Torque is input to the P3 planetary gearset by the P3 sun gear(splined to mainshaft) and the P3 ring gear that is splined to the P2 pinion carrier. The P3 ring gear rotates around the P3 pinion carrier at a slower rate than the rotational speed of the P3 sun gear, so its action resembles that of a held member. THe result is that the sun gear becomes the main path for delivering torque to the P3 pinion carrier. The P3 pinion carrier transmits torque to the transmission output shaft.


Sixth range is also an overdrive range. The input shaft rotational speed is exceeded by the output shaft to a greater extent than when in the fifth range.


Torque route: converter turbine shaft, P2 pinion carrier, P2 sun gear, mainshaft, C3 ring gear/mainshaft, C3 sun gear, C3 pinion carrier, output shaft.


Power Flow: The C2 and C4 clutches are applied and the P2 and P3 planetary sets work together to produce the appropriate output.THe C2 cluth locks the P2 carrier to the turbine shaft: The C4 clutch holds the P2 ring gear, The P2 carrier is the input and the P2 ring gear is held so the P2 sun gear becomes the ouput: The P2 sun gear rotates the mainshaft and the P3 sun gear. The P3 sun gear is input and the P3 ring gear acts like a held member. This makes the P3 carrier the output, and it is splined to the output shaft. This produces overdrive.





This is what my book says, I dont understand all of it and Im sure most of you wont but. It also shows the hydraulic schematic of what is going on but I dont have a scanner.

I'm considering trading up again...http://www.dieselplace.com/forum/smileys/Approve.gif


Anybody know for sure if the Vocational Series is coming to Dmaxville in Jan '05?

White Duramax,

Any idea what the sixth gear ratio would be in the example you provide? I believe the current fifth is 0.71.

I think 6th would be 0.61

I didn't think it would be that high? What would your speed be @ 2,100 RPM stock, 0.71 and then @ 0.61?

.71od= 73mph


.61od= 85mph


Look out vettes, now we'll have the top end 130 mph @ 3200rpm w/ 245 tires.


4000rpm and 285 tires w/ .61od = 172.5mph http://www.dieselplace.com/forum/smileys/Cool.gif

More versions for specific applications/higher input horsepower ratings on all.

Keepin' it, Howdy! Great to see your first post! http://www.dieselplace.com/forum/smileys/Clap.gif


Please explain.


Thanks, Burner-------------> http://www.dieselplace.com/forum/smileys/Big Smile.gif

I cant find anyplace it says the ratio. It does say however that all WT transmissions are configured the same for a capacity of 6 forward gears, however can be programmed for 4 or 5 speed ratios for specific applications. So they are saying only programming changes whether it has 4, 5, or 6 gears.

Hi Ray,


I know I don't have the expertise but I find this interesting. If you don't mind a few more questions. 1st, What's WT stand for and is this the trans in our trucks or ? 2nd, it sounds like the more you read on this the more it sounds like it might actually be feasible to do with the proper reprogramming. 3rd, mind sharing the name of the book your reading?


Thanks,


Chuck

.................................................. ...Edited by: Burner

http://www.dieselplace.com/forum/smileys/Confused.gif

WT stands for World Transmission. I'll have to get back tonight on the book as its at home right now.

The book is titled "Heavy Duty Truck Systems" 3rd edition


Electrical, electronics, power train, steering, suspension, brake & accessories systems.


www.delmar.com (http://www.delmar.com)

Well here's the link for the Allison web page with the Vocational Series info, including HP and torque numbers which are up quite a bit from the 1000's. Doesn't have any technical data, nor anything about a sixth gear, but it's a start...http://www.dieselplace.com/forum/smileys/Approve.gif


Says all vehicles produced for North America must specify which model by Jan. 3, 2005. I've been looking at selling mine and getting a new one, but it's starting to look like a slight wait may be in order...http://www.dieselplace.com/forum/smileys/Ermm.gif


http://www.allisontransmission.com/upandcoming/index.jsp

Thanks for the welcome Burner.


I was over at my local Alli dealer buying the current, updated, supposedly waterproof NSBU switch for my tranny and all the information for the whole line was in a brochure right on the counter. I also found same on the Alli website. There is an offroad version, tow truck version, bus version etc. I'm guessing the Alli folks aren't happy about all the aftermarket improvements to their product and want to be in the game...