Jerks at 45-50 mph, transmission suspected

My 2018 never really had it. Sometimes at 48 to 50 mph. you could feel it ever so slightly at 1100 to 1200 rpms. I determined it was because of it going from 6th to 5th or on the verge of it, shifted to 5th and went away. I have been on every tune from KDMAX and the issue is gone. I did a big extensive service at 30k miles and if it had fluid, filter it was changed, with plugs, belt, pcv valve. I know I over did it but 6 years old I thought it was time. Now the tranny fluid and filter change was done and I swear now it drives better than ever and I never had any issues ever since I was tuned. Yep fluid has a lot to do with it.

 

No one is lying. Some trucks do it some trucks don’t. Within the adaptive learning system the transmission has this creates the differences.

Some people drive 55-60 some people. Drive 80. those are usually drive 75 or 80 or many of the ones that have the problem at 55 to 60 later on

 

mine never did it either. However, very early on I checked the transmission fluid and found it to be a little over a half quart low from the factory.

I live in rural Indiana, most of my driving is 55-60. The truck learned and doesn’t seem to have any issues. I have since got the OTT tune. And when driving a 55-60 range a lot of times I am in S5

 

This thread is still going? 1000 miles in on my 23' it still drives great. I figure if it's learning how I want it to drive, I'm going to teach it. I never let it sit low rpm in 6th as I'm going up a grade, or need to speed up. I always force it to quickly downshift. Could just be me, but it seems to be helping, even though it drive really well off the lot. I find that it's holding 4th or 5th much longer without trying to go into 6th, even as i'm letting off, and downshifting when I would expect it to.

The transmission learns a 'force value' based on your driving, so if you're driving like an old geezer trying to get good MPGs all the time, it's probably going shudder a lot more. My 17' did this. My wife was the primary driver for a while, and I had to damn near floor it to get it to come out of 6th. It was always bogging. That's probably why some people notice this and others don't.

 

Seems like it has taught you how it's to be driven. Get a tune and school that Tacoma!