48RE auto transmission issues

[jrgough]

while in tow/haul when i brake to turn or slow down (coasting) to turn i feel a significant bump i think this is the t/c unlocking. I took it to the dealer and the said that was the t/c and thats normal. Has anyone encountered this same senario? Any help or comments are greatly appreciated. the truck is a 2006 slt quadcab with 5500 miles everything stock

 

[Triton]

I'd say that's normal. The tow/haul mode in meant to lock the TC in each gear. When you slow down which would be typical in a turn it gonna down shift. Because it was locked you'll feel it a bit more than a normal shift.

Not a expert with trannies but, it's what I've experienced in tow/haul

 

[AMassaro]

It is the converter unlocking. Not a problem.

 

[BBoling]

Sure it's not the transmission downshifting? This is a normal, and in my opinion, really cool feature of the Tow/haul mode. When I brake in t/h mode with fairly steady and moderate pressure, the trans will down shift, just at the right time. Really cool how it makes braking a breeze.....



BB

 

[jrgough]

i'm pretty sure its the converter unlocking because the truck will go in a idle mode, (the sound of the engine). It does it when slowing down for the turn not in the turn also. thanks guys

 

[JBee]

I've noticed something to this effect around 30-40mph when I have my trailer on and I am deaccelerating. Like previously said, TC unlocking which feels like a firm downshift.