x40oz

Recently, as I'm driving (usually speed is 45-50) the truck will shift into 4th and the motor will bog down almost like it dosent have the Hp to push the truck that speed at that RPM. Is this common? Is this a motor issue or a trans issue?

2006 FX4 SCrew 5.4L 180K new motor within the last 20k.

Dirttracker18

Sounds like the torque convertor is locking up early.

Do you have a programmer that you have altered settings for?

x40oz

No, I am stock. And from what I understand the transmission has never been into.

Especial86

iTrader: (1)

Might be the TPS sensor causing you the trouble. Can you gas the truck hard when this happens and get it to downshift?

CarlC

Does it feel like a rumble strip for a second or two? If so, I would throw a bottle of friction modifier additive in the rear differential.

primalurges

my thoughts as well. Check the TPS

x40oz

Yes, when I hit the gas it will downshift

x40oz

Will a TPS reset work or should I look at replacing?

MD4x4

I was going through the exact same problem. Today I came across how to reset the tps and I just drove my truck around for around 5-10 minutes and I think it may of solved it! When i get the chance to drive it around more tomorrow well see. Give it a try its free can't hurt.

sturtzie

So how do u reset it?? I'll search it but that woulda been a nice addition to ur post.