Post by: Craig on July 28, 2010, 03:45:43 PM
OD off
OD on
Tow/ Haul
When pulling a trailer what is the best choice to use?
When on flat roads I have been in OD on. when going up bigger hills i switched to Tow/haul for a little extra power. Is that ok or is it up to your driving style on whet to use?
I just want to make sure I don't screw up my truck.
Post by: rasbo on July 28, 2010, 03:49:28 PM
Post by: cld40 on July 28, 2010, 04:00:38 PM
Post by: GoldTip on July 28, 2010, 04:24:16 PM
:yeah:
X2
Post by: markts on July 28, 2010, 04:33:41 PM
Post by: Bofire on July 28, 2010, 05:10:55 PM
Carl
Post by: jayrod9528 on July 28, 2010, 05:11:36 PM
x3x4
Post by: FC on July 28, 2010, 05:26:07 PM
Post by: Sorefeet on July 28, 2010, 07:09:48 PM
Owners manual or call the dealer in your area
Post by: FC on July 28, 2010, 07:24:02 PM
Post by: MIKEXRAY on July 28, 2010, 07:32:39 PM
Post by: bobcat on July 28, 2010, 07:34:59 PM
Post by: JackOfAllTrades on July 28, 2010, 07:46:35 PM
Does the Dodge automatic transmission Tow/Haul feature do the same three things that happen when engaging the same feature on the Ford transmission? Where as- In Tow/Haul mode, the transmission locks the torque converter and takes the gear out of over-drive and engages 'transmission' braking. Most owners manuals I've read say that you should not tow, (over x amount of weight), in over-drive, as that is the weakest gear set in the transmission and the big V10's or Diesels have enough torque available that a person could damage the transmission.
I suggest that you read the owners manual.
I don't have any of this as I have a manual ZF 6spd behind my diesel. I tow in over-drive all the time until an incline makes the engine labor, then I down shift when I should. Same with decelorating down a grade, I select a gear that allows the truck/load to cruise at or very near the speed limit with just a little bit of breaking if need be.
-Steve
Post by: Special T on July 28, 2010, 07:49:56 PM
Post by: jackelope on July 28, 2010, 08:11:19 PM
Tow/Haul boosts line pressure in the trans, makes it shift later and harder, thus keeping the RPM's up so you don't lose momentum when the trans shifts and the R's drop. It's nice when you're hauling big stuff. If I remember correctly you've got a Hemi mega-cab...lots of power there...unless you're pulling a huge new boat, you can go with or without tow/haul. I towed a 21.5 Bluewater cuddy cabin boat with my 1/2 ton chev truck and 290hp and did fine without hardly ever using tow/haul.
Post by: JackOfAllTrades on July 28, 2010, 11:20:47 PM
Quote
Trade that POS doge auto in and get a 6 speed stick!
damn man.. Don't hold back a bit! That's not nice. Automatics do have their place.. (not in my truck) Although, my half brother has put two auto transmissions behind his Cummins now. All of the big three have issues with the auto transmissions behind diesels. Jackalope said something about this being a gas engine/auto transn though.. So be it.
We can't convince everyone to drive a stick! :rolleyes:
-Steve
Post by: jackelope on July 29, 2010, 07:29:54 AM
I didn't recall the boosted pressures that Jackalope referenced, but no body answered my question about the Dodge transmission in tow/haul mode.
[-Steve
No overdrive and no TCC lockup plus the boosted line pressure/late shift.
Post by: Woodchuck on July 29, 2010, 07:43:18 AM
Post by: JackOfAllTrades on July 29, 2010, 08:36:38 AM
Quote
Allison's have issues?Yup, just as many issues as the Ford TorqeShift. As I said, 'All of the big three' have automatic transmission issues. Especially when behind the high torque engines.
http://www.dieselplace.com/forum/forumdisplay.php?f=41 (http://www.dieselplace.com/forum/forumdisplay.php?f=41)
Heard some horror stories about the Allisons in military Hummers too.
-Steve
Post by: jackelope on July 29, 2010, 09:05:58 AM
Not wanting to jack this thread....QuoteAllison's have issues?Yup, just as many issues as the Ford TorqeShift. As I said, 'All of the big three' have automatic transmission issues. Especially when behind the high torque engines.
http://www.dieselplace.com/forum/forumdisplay.php?f=41 (http://www.dieselplace.com/forum/forumdisplay.php?f=41)
Heard some horror stories about the Allisons in military Hummers too.
-Steve
Military H1's I didn't think had the Allison transmissions in them. The only H1 to have an Allison that I'm aware of is the Alpha 1 H1 which also has the Duramax engine. I could be totally wrong there as it's been +/- 6 years since I worked at the Chev/Hummer dealer. The Alpha 1 was selling for $130k new back then :o
We truly see very few transmission issues in the Dodge truck transmissions. The problems that we do see are mostly electronics and not hard parts. The hard part issues we see are usually fixed by replacing the governor pressure sensor and the transducer. We do a lot of these after Aamco has rebuilt the transmission and not fixed the problem.
Same problem is pretty common in the WJ Grand Cherokees.
Post by: JackOfAllTrades on July 29, 2010, 09:22:13 AM
-Steve
Post by: jackelope on July 29, 2010, 09:59:28 AM
1 had a casting plug left in it from the factory...blocked fluid flow and burned the trans up 1k miles.
The other was a mis-diagnosis and according to Allison should not have been replaced.
The policy to date is to not "repair" Allison transmissions...The dealers have always had to replace them without taking them apart. In the 3 years I worked for Chev where we had the HD trucks with the Allison transmissions, I only handled 1 replacement personally.
:twocents:
Post by: Woodchuck on July 29, 2010, 10:18:26 AM
Post by: jackelope on July 29, 2010, 10:19:21 AM
With all due respect to the other manufacturers, and each one of them has their own high and low points. as some of you may know, i have spent a day or three in the auto service biz, i base my decisions on what vehicle i would buy on how much money i make off each type of rig and in the world of hd trucks, i dont make much money on the duramac/allison combination, so...i have one and it does everything i need it to do without question. :twocents:
Thats about all I can base my opinions on too.
Post by: Special T on July 30, 2010, 07:02:58 AM