Weird transmission problem…

Sitting at dealer now…

About a week ago when putting it in D, the truck would not move. Revved the motor, nothing. Tried it again, brought the revs to 3.5k and still wouldn’t budge. Turned it off, cycled the parking brake, shift lever and then restarted. Same thing. Finally, I revved it higher and it went BANG! and the truck shook and lurched forward. It drove fine but got mileage in the 10-12 range for a gallon on so. At dealer right now and they found no issues on test drive. But they found codes on the computer that require a Telematics ECU replacement. Not expecting that? I had the TRD lift kit installed a while back and am wondering what in the hell is going to happen to all those calibrations they had to hand enter for the camera and grill sensor. What a bitch!

 

Low on fluid?

 

Apparently everything checked out fine with the driveline…

 

My guess is that it was parked after either driving in heavy rain or washing. The rear shoes rusted to the drums. I try to get in the habit of not setting my parking brake after washing. This has happened to me, but not as severe.

 

It has been really rainy here. Could be the culprit?

 

Given that everything checks out fine with the gearbox, Threebeers might be onto something here.

 

I had mine sitting overnite after a car wash with ebrake set. When I put it in D (or R) the next day, truck wouldn’t budge, but I could tell that something was siezed up (turned out to be ebrake after being engaged, wet). Was your situation similar or was the trans actually slipping?

 

Sounds like a bad/broken torque converter.

 

Or if the parking brake was stuck and they were revving it to 3.5k until something went bang then that definitely didn’t feel good to the TC. lol

 

his parking brake was probably seized and maybe he fucked up his torque converter by clutch dropping it at high RPM

 

Why is it that some folks fail to post the year, model & trim level of their Tacos when chasing solutions to problems?
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It's to every TW member's benefit - including the poster - to share these details. Others may have a similar problem (same year/model/trim) OR, better still, have experienced the same problem AND found a solution.
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My rant is over for today.

 

because it's not relevant

 

I beg to differ.
Many times it is VERY relevant.

 

How do I drop the clutch in AT?

 

sorry. you don't. but it sounds like the transmission didn't engage until about 3500 rpm which would put some serious strain on the torque converter which could amount to the "bang" OP heard

 

So the dealer found that the ECU is trashed?! That doesn't sound like a e-brake related problem.

 

It’s a 2020 OR 4X4 AT, 39k miles…

 

Im not sure what it is… Telematic control module?

 

Same here.

 

Did the truck "squat" or feel like it wanted to move when you gave it gas or did it feel like a neutral drop when it finally went?