Hey Guys,


I Have a 03 standard cab duramax and it seems to me that there should be one more gear in the transmission.. I know that it would pull it especially on flat ground and when you come to a hump you could always shift back to sixth.


Or has anyone put a gearvenders unit behind a ZF???


Jim

I've done that more than once. Not as often with 35's on it but now and again I'll try.http://www.dieselplace.com/forum/smileys/Big Smile.gif

My problem is I would need 2 auxilary trannies to get what I want. A higher high gear and a lower reverse. The split between 3rd and 4th could be smaller too!


2:1 underdrive (low range) and 0.5 OD would be perfect I think.


1U = 11.58:1


2U = 6.62:1


1D = 5.79:1


3U = 4.20:1


2D = 3.31:1


1O = 2.90:1


4U = 2.62:1


3D = 2.10:1


5U = 2.00:1


2O = 1.66:1


4D = 1.31:1


3O = 1.05:1


5D = 1.00:1


6D = 0.72:1


4O = 0.66:1


5O = 0.50:1


6O= 0.36:1


(OK, so 6O is too tall for running straight down hill off a cliff, but otherwise a gear for every season.)

Why the hell did they put such a tall reverse gear in these trannies? I end up burning the hell out of the clutch trying to back a big trailer into a tight spot.


Otherwise I'd like a gear in between 3rd and 4th, and between 5th and 6th, and I'd be a happy camper!

Jeez, I give you 18 ratios and you still think it needs another hole plugged. (you'll notice that 5D and 6D are adjacent in my list.) I definately plugged the 3rd to 4th hole though.





Actually since you have a 4x4 you can splice a switch into the wiring to disable the front axle disconnect, to keep it from engaging when you shift to 4 low. (If you have a manual T-case just pull the 4x4 fuse). Viola, you now have 2WD low range for campground manuevers. Almost makes me wish I'd bought a 4x4.Edited by: Colorado Kid

Good idea on the 4x4 fuse! I'll keep that in mind, I've got the manual t-case. Thanks!


The gear spacing isn't that big of a deal, the Juice/Attitude more than makes up for it. I just need to keep reminding myself to rev it out farther in 3rd and 5th before shifting when I've got a heavy load on. It has more than enough power to lug low, I just feel guilty for doing it to the poor thing.

Are you guys using the throttle while backing? I've never had a problem backing IF you keep your foot off the gas. I let the computer give it fuel, you just do'n go very fast.

no I do the same thing as you, but when you're on uneven or uphill ground you have to use the throttle to keep it from stalling as you engage the clutch sometimes. Reverse seems plenty slow when you're out in the open but when things get tight things happen too fast it seems.

Camstyn,


How is the juice/attidute working with the 6 speed? I'm leaning that direction but would like some feedback from someone that has experience with that setup.


Thanks,


MaxRock

Just idling in reverse, but I'd like to be able to back the 5th wheel in without slipping the clutch nearly all the time. Idling is as fast as I'd ever want to back up with the trailer on . . . the spotter has to be able to keep up walking. Even just backing up my driveway and into the garage idle in reverse is pleanty fast.

When Im in reverse and slipping the clutch, it is NOT smooth. The whole truck shakes.

That pry aint right.

MaxRock, it works great with the 6-spd. Excellent low end torque, pulls very hard in every gear. Terrible traction in the rain though! I almost put it in the ditch on Saturday and I was being careful. Turned the power level down after that.


Only drawback is since it advances the timing you lose a bit of engine compression braking. Not much, just enough to notice.

When Im in reverse and slipping the clutch, it is NOT smooth. The whole truck shakes.

That pry aint right.


Mine shakes sometimes . . . more often since the new pressure plate and slave cylinder. The old one was very smooth after I let some of the smoke out of it at TDP Pull-off.http://www.dieselplace.com/forum/smileys/HiHi.gif My wife thinks I should smoke the new one so it's easier to drive smoothly. I haven't decided to do that yet.


My '91 C1500 had a front seal leak on the tranny, which periodically caused clutch chatter. I'd just slip the clutch hard (full throttle) in 5th gear for 3-4 seconds and it would smooth right back out.

Camstyn,


Do you have any trouble with the clutch slipping??? What size trailer do you pull? I have a 33' 5th wheel that weighs in around 10.5k. Stock the truck pulls ok, but you can never have enough power!!!! http://dieselplace.com/forum/smileys/Thumbs%20Up.gif


If memory serves me correctly, you are running the H2's??? No problems with the H2s and da juice???


Thanks,


MaxRock

Biggest trailer I've pulled was a bumper pull 22x8.5' enclosed cargo trailer, the dmax pulls it like it's not even there.


You are correct I'm running the H2's and haven't had any problems at all with them or the juice. They work great together. After installing the H2's it needed something to help out with the power and the juice is overkill but what the heck.http://www.dieselplace.com/forum/smileys/Embarrased.gif