D_ALLAN

Truck is 2012 157" WB Eco FX4 4.10 ELD. The truck is completely stock with 5200 miles. Since new it will not shift into sixth until 64-66 MPH. If I shift it to 6th manually it will remain there until the low 40 MPH range dependeing on load. In tow/haul mode sixth gear upshift occurs much sooner. Have any of you experienced this and do you know of a reflash or revised calibration to address this issue? No issues with the truck just trying to improve shift strategy. Thanks,Doug

gsxr1216

mines in 6th by 45mph, sometimes even 40. mine has the 3.55 rear end though.

PRNDL

Weird. Programming issue? Maybe a reflash is in order? Love the 4.10's man

mrpositraction

Mine has the same thing, I am working with the dealer to get this resolved. They say a reflash will fix it.

nullname

You know, I think I noticed this the other day, thought about it briefly and then forgot. I'll try to check it out today, I have a 2013 and 3.73.

maplelakeduckslayer

It should be in 6th at 40 mph. Meaning if you acclerate and set the cruise at 40 mph, it should be in 6th

ajkelly

I had a 2011 eco with 4.10's and presently have a 2013 eco with 4.10's. Both of mine act as you mentioned. If you hit the tow haul button while in the 50-63 range it will go into 6th gear. Then hit it one more time to go out of tow/haul and it will stay in 6th. At first it bothered me, I now have larger tires on and kind of like it waiting for the upshift. Your right it will hold 6th pretty long at slower speed (40-45) if you don't mash the throttle while going up a hill.

nullname

I monitored mine today and at times she didn't pop into 6th when at speeds of 70mph! RPMs were under 3,000.