transmission or tune?

laramieram · Mar 5, 2017

2012 1500 4x4, 180 thermostat, s&b cai, oil catch can, hemifever tune. Recently I have noticed that while having a slight load, normally ascending a grade, a very slight grade will cause it, at the right load the truck surges and the rpms jump and fall about 2 to 300 rpm. This happens at about 1100 rpm when just ever so slightly pressing the accelorator. Almost like it wants to down shift but it doesn't. Hard to describe but almost like a vroom...vroom....vroom type deal. It will happen for several seconds and finally shift or I have to take my foot off of it and then give it some to force it to shift. Not saying this is the cause, but after the last update from Sean this started happening. Are the transmission shift points tuned as well? I have yet to data log it and send it to him. Other than that it is about as smooth as it could be. Feels great otherwise. Ideas?

HammerHead · Mar 5, 2017

I would see if it does it with the stock tune in it. My last updated tune from my tuner I'm having sputtering issues in between shifts. Doesn't do it with the stock tune or a canned tune.

shane1981 · Mar 5, 2017

To directly answer your question - tune

tuned by Jay Greene

nateinva · Mar 5, 2017

I've experienced the exact same symptoms on my 2011 with HF tune. Attempts to resolve it have not worked.

I can guarantee you it's the tune and not the transmission.

The canned Diablo tunes and stock tune don't do it.

I went with another custom tuner and have no issues, truck runs hard and shifts great.

liftedgm1982 · Mar 5, 2017

nateinva said:
I've experienced the exact same symptoms on my 2011 with HF tune. Attempts to resolve it have not worked.

I can guarantee you it's the tune and not the transmission.

The canned Diablo tunes and stock tune don't do it.

I went with another custom tuner and have no issues, truck runs hard and shifts great.

Now we have to know...which other custom tuner??

Sent from my iPhone using Tapatalk Pro

nateinva · Mar 5, 2017

Hopefully the mods don't mind me mentioning. Jay Greene.

Having paid for both and had the opportunity to try both, I like the way my truck runs much better with Jays...from idle to wide open.

Plenty of people happy with HF though, but there have been a lot of similar threads about shifting issues lately.

shane1981 · Mar 5, 2017

^^^^

tuned by Jay Greene

Bobbo · Mar 6, 2017

Had a similar issue when I got my custom tune. The extra power from the tune made the MDS switching on/off feel like a surge. Disabled MDS and problem solved.

powderbrad · Mar 6, 2017

I had issues recently, fairly similar.

Talked to sean at HF and had him adjust the torque converter lockup rpms. (Widen the engagement points)

Seemed to help the driving issues I was having. My affected rpm was 1400-1800 ish.

HammerHead · Mar 6, 2017

My tuner is Jay also but he promised me it wasn't his tune. Long story short I'm running a canned tune and it sucks. My only other option is HF.

chris52010trx4 · Mar 6, 2017

Ive got the same issue and still trying to figure it out... its on any sort of incline on the road... but mine is between 1200-1500 rpm... tuned by jay greene.. and still trying to figure out what the issue is..

shane1981 · Mar 6, 2017

Have y'all talked with him to try to figure out the issue so far y'all are 2 of 2 I've ever seen with an issue on jay's tune.

tuned by Jay Greene

chris52010trx4 · Mar 6, 2017

yes i have... trucks in the shop for body work atm.. so plan on going back to stock when i get it back to see if it does it stock... he had just sent me a revised tune but it still happens

shane1981 · Mar 6, 2017

chris52010trx4 said:
yes i have... trucks in the shop for body work atm.. so plan on going back to stock when i get it back to see if it does it stock... he had just sent me a revised tune but it still happens

If it doesn't happen on stock then obviously its something in the tune if so I would set it to stock then do a new backup of the stock tune and send that to him.

tuned by Jay Greene

shane1981 · Mar 6, 2017

make sure your tuner is updated first before you set it back to stock.

tuned by Jay Greene

Hemi395 · Mar 6, 2017

Think I've had this happen in 4th gear (3rd for 545RFE) a couple times since my truck was tuned. It has to be a very specific set of circumstances for it to do it so I thought it was just a fluke until I read through this. Currently runing a 3rd revision HF 93 tune.

Honestly my truck has been different overall since I did the initial calibration update when I first got my Trinity. Not sure if it's related...

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RLJ10X · Mar 6, 2017

You're going up a hill with a load at 1100 rpm, and you have no clue why your truck isn't happy? Really?

For pity sake, give that poor truck some rpm to work with. Up a hill with a load, and my truck would be turning at least 2200 rpm.

Gas is cheap right now. Burn some!

nateinva · Mar 6, 2017

The problem isn't putting your foot on the skinny pedal...It's how the skinny pedal responds when putting said foot on it.

shane1981 · Mar 7, 2017

I've come to realize there is a little more to the stories here

tuned by Jay Greene

cableguy_hd · Mar 7, 2017

damn, I got 400$ set aside for a tuner and custom tune. this has me concerned.

transmission or tune?

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