These transmissions are know to have issues at large throttle openings. They either don't shift, or you get the flare between gears. Pretty much what happened to you, apparently. I am thinkin' doing the electronics, and a band adjustment, and you should be OK.

 

Stomping on the throttle at a relatively low speed while in over drive and lock up will send the rpms way up. Before stomping the throttle hit the over drive button(off) and it will kick it back down in to third. Sometimes the pcm will keep the od on below where you need more power to accelerate.

 

Mine seems to be a bit psychotic about that... sometimes it will kick down just fine, then shift back into O/D, when the time comes. Others, I almost have to put the pedal to the floor to get it to downshift......

 

Interesting...thanks! I will keep this in mind next time.

 

That seems to be how mine is...sometimes fine, other times (like the episode I experienced the other night), it doesn't want to downshift at all.

 

I've had the truck parked all week since last Saturday's scare. Last night, I had to run a quick errand, so I decided I'd take the truck out for a cautious test drive. I immediately had another bit of an issue, this time before I could even get moving. When I started the truck up and shifted into reverse to back out of my driveway, nothing happened. Normally as soon as I put it in reverse, the truck will start to roll backward, particularly since the truck gets parked on a slight incline. When the vehicle did not move, I pushed in ever so slightly on the accelerator pedal, and still nothing happened - the RPMs hardly even moved. It was like the truck was parked up against an immovable object. Then, after a second or two, I heard a fairly loud clunk, and suddenly the truck started moving backwards. I was afraid something in the driveline or differential had just sheared/broken, but actually all seemed to be well. I backed out of the driveway and drove carefully to the store and back, and everything seemed to operate smoothly and normally.

So, what was that clunk I heard, and what might cause the truck to essentially stay stuck in park when shifted to reverse? As I'm typing this, I just remembered that this happened to me once before, maybe 6-8 months ago. I had been driving the truck, and it had been bogging down quite a bit that day, and I parked to run inside an office building quickly to drop off something. When I came back out and started the truck, it initially would not move. And it was the same type of thing where the engine wouldn't really rev either, again like I was parked up against a wall or something. That time I believe the shifter was in drive instead of reverse. I ended up turning off the truck for a few seconds and trying again, and then everything worked normally. That had not happened again until last night, and I had actually forgotten about it until just now.

Has anyone else ever experienced something like that? Perhaps I'm developing some slop in the shift mechanism and it's not properly "landing" on the gear selection? Despite wanting to remove the check valve in the transmission cooler line, I have not yet done so, so I can't imagine it's an issue with the torque converter not being filled, particularly since the engine RPMs do not increase with the gas pedal being pushed.

 

How cold out was it when you tried to leave? My truck sits parked in the driveway for days at a time, and if we get a thaw, and then a freeze...... I have to push the go-pedal pretty hard to get it to break loose. And yes, it does make a rather rude noise when it does so.

 

It has actually been much warmer here this week. In fact, it hasn't been below freezing at all since I had the weird transmission behavior last week. And the only other time this had happened before, it occurred in the middle of summer. Do you think this is caused by the rear drums freezing/locking up?

Haha, that is a great way to put it! I think I uttered a few "rude" words when I heard it happen, too.

 

That sounds like something's sticking in the valve body or you've got an internal leak.

 

Probably wouldn't hurt to inspect the rear brakes.....