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I have a question that possibly someone could help me with. I'm new to the forum so bear with me. I am towing a small 3900 pound travel trailer with my new 2011 Titan Pro 4x. (The truck is equipped with tow package, tow mode, etc.) The truck performs fine until I hit 4th gear, then it bogs down and loses RPMs immediately and I end up back in 3rd gear. The truck flies in gears one through three, but it really hits a wall in 4th. When it shifts to 4th it drops about 1500 RPMs. I have two questions. 1) Is anyone having this no power in 4th gear problem with a light load like this? And (2) Will it hurt the engine to run at 60+ miles an hour in 3rd gear at 3500 rpms for a long period of time? Any help would be appreciated.
 

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Have your fuel pump pressure checked. It should be near 51 PSI. There have been problems with the pumps, especially if you often let fuel levels get very low.
 

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reply from scr38

SCR38,

Thanks for the idea. I'm going to have that checked asap.
 

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The only time my truck has ever done anything like that is when i accidentally ran it in OD. Once I put it back into 4th I have no problems with it. I have noticed it seems to shift too soon, in my opinion, into 4th at lower speeds which can make it seem like it is bogging down a little. I know it shifts through the gears a lot quicker than my 04 did.
 

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Ok...The 2010+ Titans got new torque converter mapping and it is extremely intrusive. Especially when towing or accelerating onto the interstate. I have a center shifter so what I do is hold it in 4th (torque converter still locks) until I hit 60mph were I shift into D under normal driving conditions. I towed 4500lbs in 4th, in a non BT and she did fine.

What happens when it bogs down is...at approx 40-45mph under "normal" acceleration, the trans shifts into 4th, then locks the torque converter, almost immediately unlocks and shifts to 5th, then locks out in OD again. Idk why nissan designed it like this but they are the engineers so I dont question. I do know the purpose is to increase gas mileage, reduce transmission temps, and increase energy usage (i.e. reduce slippage). Just for the record, your truck is operating as designed I promise. Dont leave it in 3rd at 60mph...eventually the trans will overheat. Hold your trans in 4th once you get to cruising speed or you see the trans getting hot. Allow the torque converter to lock in 4th...and at 60 mph it will hold you rpms at around 1800-1900rpms (2.94), and 2000-2100rpm, i think, (3.36) which is a perfect rpm for cruising with a load. Keeps it in the power band better. To accelerate, slowly depress the pedal and it will gain speed...just be patient. If you want to unlock, double pump the gas or increase pedal input % to at least 50%. I know the truck tends to shimmy a little when trying to accelerate but thats just do to engine speed. Its a good towing truck you just have to learn how she likes it.
 

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That's a pretty weird explanation. I'm not saying you're wrong, I just think it's weird.
 

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That's a pretty weird explanation. I'm not saying you're wrong, I just think it's weird.
If you have not drove, particularly towed with a 2010+...then it would be weird. Ive owned an '08 and '10 and there is a HUGE difference in the transmission/TC mapping. First 6 months I fought the dealer cause I thought there was something wrong. There has been a couple threads on here or/and TT having to do with this subject. If you watch listen and feel, you can feel and see (tach) what I was saying.
 

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I am going with the transmission is locking the torque converter in 4th like it's supposed to do. I bet when you ease into the throttle while in 4th the rpms don't go up do they?this means the torque converter is locked in. If you ease into the throttle in 3rd gear I bet the rpms jump up immediately the drop back down as you release some pressure off of the throttle. This means the torque converter is not locked. Its kind of like having a stall converter in the tranny instead of the standard oem TQ.
 

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If you have not drove, particularly towed with a 2010+...then it would be weird. Ive owned an '08 and '10 and there is a HUGE difference in the transmission/TC mapping. First 6 months I fought the dealer cause I thought there was something wrong. There has been a couple threads on here or/and TT having to do with this subject. If you watch listen and feel, you can feel and see (tach) what I was saying.
I completely agree with you on that. When i went from my 04 to my 2010 I thought there was something wrong with it. Not just towing but everyday driving. It took awhile to get used to it and I still sometimes wonder if something is wrong.
 

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I'm not making fun of you guys but it sounds like Nissan needs to send 2010+ Titan owners to a class before they drive off the lot.
 

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I'm not making fun of you guys but it sounds like Nissan needs to send 2010+ Titan owners to a class before they drive off the lot.
Or just put it back to the way it was before. If they wanna save gas, they need to add more higher end gears and add more function to the "Tow Mode" button, not go jacking with the TC. There's a reason Mercedes, Audi, & BMW are using 7-sp transmissions and getting superior MPG, someone should get the hint (Nissan).
 

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Have you ever seen a 1/2 ton pickup truck with more than 5 gears in an automatic? There is a reason for not having more and more gears. The biggest one I can come up with now is the tranny would run hot as hell while pulling any trailer or any heavy load with it. It would be shifting gears constantly thus building up more heat. The way to get better mileage is drive as close to the speed limit as possible especially when on the highway. Build a a stronger more durable tranny and rear axle and pull more hp and tq from the engine. All of these together will make abjure fuel economy difference.
Before I got my Titan early in 06 I had a 2000 model f-150 svt lightening. I did a hand full of power upgrades including a cai, full 3" exhaust and I got a slightly smaller pulley for the eaton fuller bottleneck supercharger. The last time I had it on a dynojet I was making rite around 480hp to the tires. That number may be a little off but it is close and it's been several years and I just don't remember the numbers very well. I know the 480 is rite actually because I was pissed I didn't hit the 500 mark. That was my goal.
The point of all that useless info I just typed out is I could get over 22mpg on the highway with that truck running 80-90 mph and closer to 24-25 mpg if I went the speed limit. Even when o would pull my jet ski to the lake and back I would still get over 20 mpg at the 70-80mph range. All of the extra hp will help if you can keep your foot out of it. Honestly, I shouldn't be the one to talk about driving the speed limit as I have the tickets to prove it.
If you ever want to have some real fun you need to get a 98-2001 ford lightening and race mustang cobras and z-28s while pulling a jet ski. They just don't know what to do when I would kill them while pulling around a thousand pounds of jet ski and trailer.
 

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Or just put it back to the way it was before. If they wanna save gas, they need to add more higher end gears and add more function to the "Tow Mode" button, not go jacking with the TC. There's a reason Mercedes, Audi, & BMW are using 7-sp transmissions and getting superior MPG, someone should get the hint (Nissan).
I agree...I loved the way my 08 shifted. Its harder to explain then the actual doing of btw. What I said is def not required...you can just drive it in D but I actually see a steady increase of 2mpg over leaving it in D that way. My statement was simply just my 2 cents...take the advice or leave it, up to you. I have a feeling many ppl dont pay attention, or just dont care enough to notice.

Cayers1122, there are trucks with six speed trannys...Tundra I know for sure.
 

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Discussion Starter #15
I am going with the transmission is locking the torque converter in 4th like it's supposed to do. I bet when you ease into the throttle while in 4th the rpms don't go up do they?this means the torque converter is locked in. If you ease into the throttle in 3rd gear I bet the rpms jump up immediately the drop back down as you release some pressure off of the throttle. This means the torque converter is not locked. Its kind of like having a stall converter in the tranny instead of the standard oem TQ.
I guess I'm not completely getting the "locked" thing. But, when the truck is shifting through the gears going from first through third, it runs like it's barely towing anything. And I noticed as it goes through those gears, when it up shifts it seems to drop about 500 rpms when it goes into the higher gear. But, when it shifts into 4th, it drops about 1,500 rpms and its like hitting a wall. It loses speed, and the only way to get back up to speed is by hitting the throttle and downshifting into third. On flat ground it will barely maintain 60 to 65 mph in 4th, but if I hit anything that's slightly up hill, forget it.
 

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Have you ever seen a 1/2 ton pickup truck with more than 5 gears in an automatic? There is a reason for not having more and more gears. The biggest one I can come up with now is the tranny would run hot as hell while pulling any trailer or any heavy load with it. It would be shifting gears constantly thus building up more heat. The way to get better mileage is drive as close to the speed limit as possible especially when on the highway. Build a a stronger more durable tranny and rear axle and pull more hp and tq from the engine. All of these together will make abjure fuel economy difference. trailer.
I doubt there's a valid reason. I drove some Freightliner and International Autoshift Semi-Trucks that got about the same MPG hauling a fully loaded trailer as a Titan on 35's gets. I think that if a Semi Truck hauling a 18-30 ton load can handle an Automatic transmission, a little ol' 1/2 ton shouldn't have any problems with it.
 

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well brother i think something is wrong with your titan then. i have a 2011 non bog tow titan and i tow a 25' travel trailer that weighs i belive 4800lbs. i have traveled all across the south with it and i leave mine in over drive just about all the time. it tows just fine staying at 65-67 mph all the time. sounds like its time to hit up a dealership if i was you
 

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Had an '05 I bought brand new in Anchorage AK. It was non big tow, but it was a 4x4 off road, so it had the same gears. I towed a 6500lb trailer when I moved back to TX. I had ZERO issues towing and accelerating up the steepest of the Canadian Rockies. I now have an 07 with the big tow, but have yet to tow anything (Bought used in Feb.). I have not seen any acceleration issues there either. I would believe the people posting about the 2010's and up.
 

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I guess I'm not completely getting the "locked" thing. But, when the truck is shifting through the gears going from first through third, it runs like it's barely towing anything. And I noticed as it goes through those gears, when it up shifts it seems to drop about 500 rpms when it goes into the higher gear. But, when it shifts into 4th, it drops about 1,500 rpms and its like hitting a wall. It loses speed, and the only way to get back up to speed is by hitting the throttle and downshifting into third.
Is that in tow mode? As I recall tow mode only affects the first three gears. So maybe it makes sense that fourth acts differently?
 
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