When I am driving in 4A, it drives a bit rougher. Not as smooth as in 2H. No grinding or odd noises. Just rougher. Haven’t had to use 4A or 4H or 2L in over a year since no need for it with no weather events. The only other odd thing I notice in 4A is when excelerating a little harder than normal, it pulls to the left. Not terrible but noticeable . I attribute that to power distribution not being perfectly equal

anyone else notice this on their

running a 2016 Lariat 3.5 Eco SCREW. No mods. OEM wheels/tires

 

Torque Steer is the pulling.

Rougher, could be 4A constantly engaging / disengaging, or just the power distribution.

 

I have not experienced noticeable torque steer on dry pavement in 4A until recently with a little over 63,000 miles (i.e,. torque steer, noise in the front differential, pulls to the right under acceleration, etc.) It is obvious on snow covered roads when the traction engages, but my truck behaves similarly on dry pavement now. I posted separately that something may be going on in the front (TCCM, TC, etc.).

 

Those symptoms would lead me initially to the clutch packs in the TC.

 

No torque steer noticed here. Yeah a bit rougher while accelerating, which is when front axle is engaged in « normal » driving mode. At cruising speed, powertrain should progressively disengage front axle. You can use « power distribution » cluster view to visualize this happening. It should not be rougher when power distribution is back to 2wd. Power distribution in 4A varies greatly depending on conditions (load, acceleration, traction) and driving mode (almost
always in 4wd in wet/snow mode).

 

I have always experienced a little torque steer while in 4A and driving on slippery road conditions. I have always experienced a jerkiness when starting up from a stop in 4A. I have always considered it was a symptom of the system adjusting the torque to the various wheels as it determines necessary.

 

I can’t say I’ve noticed any roughness. No torque steer either but I don’t go around flooring it so…

 

Yes, you will notice, if you perform the TSB for trucks with 4A, which basically engages the IWE's full time, you will notice in the steering.

 

Just a POI for you and every other person on here with a 4x4 / 4A / Locking Diff / etc.
Going over a year without engaging these systems is... in my view only...a little irresponsible.
You all really need to engage the systems more often than once a year!

Its like never checking the spare tire then getting a flat and realising the spare tire is flat too.

Engage your drive systems monthly and make sure they all work and engage/function properly.
Especially when your vehicle is under warranty.
Thats the best way to discover of theres a problem with any of them.

 

I totally agree. But I have done little driving over the last year or more. Just some in town stuff and a trip pulling a uhaul for son in college out of state. Prior I would switch to it in bad weather, rain or snow. But will start to exercise it more