Well, I suppose Chrysler is correct. I always thought tow/haul mode retained 5th gear but took a long time to shift into it. Apparently it was 3rd/4th it was holding out on. 5th gear must be so close to 4th because my truck only noticed a 300rpm difference between the two at 70mph. It also took my truck 2 full miles to shift from 4th into 5th at 70mph on flat level ground even with the cruise control on. I think that's ridiculous! 2 miles. I always thought i still had 5th gear because apparently my truck rarely ever makes it to 5th gear. How pointless is that?

Anyways, my apologies for bickering about it and i felt like ranting as well....lol

 

Wow, you’re truck rarely gets into 5th? They must have changed the transmission programming between 06 and 08. If I’m not in tow/haul or o/d off mode, once I get to a constant speed, my truck shifts from 3rd to 4th to 5th in around 5 seconds.

 

The owners manual is your friend

 

Mine hits 5th pretty quick, well less than 2 miles for sure. It adapts to driving habits, do you not get out on the open road much?

Until my test, Dog, I didn't realize the small drop between 4th and 5th either. I guess every little bit helps @ 70mph which is the speed limit part of the way to work. Today, it was 75 degrees and I got 20.2mph on the highway coming home driving 70, then 65 then 55. Filled up when leaving and again when I got off the interstate. Truck runs better too, I had to kick it from about a 20mph roll to hit an entrance ramp later in the day and it kicked back into 1st and pulled harder than it ever has!! I was impressed!!!!! Oh, and with the 93 tune from my Predator, the tranny still hasn't blown up

 

is it me.. or when running tow haul on the highway my truck will run like 2900rpms at like 65 and then when i completely get off the gas the truck likes boggs down and sounds like it is about to die and drops to 1900rpms and runs perfectly fine after that??

 

It will delay 4th for awhile in tow/haul mode for a while until your speed levels out and the throttle is at a low level for a bit, sounds normal.

 

Fifth gear is pretty much useless. With lower gears in the axles it would probably be better but with 3.55 gears any slight incline and the truck is back in 4th gear. Here in Colorado where you can't go anywhere without going up and down hills my truck hardly ever sees fifth gear.

Fourth gear is .73:1 ratio while fifth is .67:1 (if I remember correctly). Unless you're driving about 100mph, rpms in fifth gear are too low that the truck isn't in its power band.

 

it automatically starts downshifting to assist with slowing down/braking in case you are towing. maybe thats what you are feeling.

 

yea it feels like im running in like 2 or 1 setting.. I thought there was something wrong with my trans because it doesnt do that ever unless on the highway

 

it only downshifts automatically when in tow/haul i believe, otherwise it wont do it. i like it, i drive around all the time in tow/haul. back off the throttle for a red light and she starts downshifting and slowing down.