After sixty mph the transmission has a shifting issue

Good morning,

Does it shift through all the gears?

I need more information. what is the exact issue?

https://www.2carpros.com/articles/automatic-transmission-problems

How long since you changed the oil/filter in the transmission?

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Roy

I just put new oil in about two months when I put new torque converter thing that was my problem. Even though that was one issue that did need to be done. It will shift through all gears but it only does when I let off gas and press gas in again. It will stay in gear at high rpm's until I do as I said. But if I ease into the gas pedal it will shift on its own. Just not when you try to get up to speed little quicker.

Okay, is the check engine light on? are there any codes?

There is a transmission shift cable attached to the throttle body linkage. are the brackets tight and the cable connected?

Roy

No, codes. I have not checked all that. I did have someone tell that it could be the shift cable. I reput on the cable after I took transmission out to replace the torque converter in it. Could the cable be a problem?

Yes it could as it controls the throttle valve which controls the shift points.

Roy

Okay. I was thinking it would be the valve body clogged, but I try shift cable and linkages first. Thanks

Okay, you are welcome.

Always glad to help.

Roy

I forgot that when I go up hills my truck would only go 25-35 mph to go up. Would that still be linkage?

no, does it downshift to a lower gear?

is the engine running okay?

https://www.2carpros.com/articles/engine-has-low-power-output

Roy

Engine runs fine. As far as I know it's something with transmission. It does high rpm's at time in a gear until I let off gas and press it again to shift in a gear. I don't think it down shifts like it is suppose to.

The only codes are for o2 sensors an evap large leak. There's no other codes on my truck. It has a timing chain. Could the chain jump a tooth without putting a code?

If I go 65 mph it jerks back and forth.

This is a transmission issue.

Did you try adjusting the shift cable?

Roy

That I have not done. I was looking at getting a new one. I'm going to look at that an the linkage areas. when I get the chance to. Could the valve body cause any of the issue to?

yes it could but need to start somewhere.

start with the cable adjustment.

Roy

Okay. Thanks. I'll also, get new bushing pieces for the linkage.

Sounds like a plan.

Roy

Thanks again.

You are welcome.

Glad to help.

Roy

Could a clog transmission fluid cooler affect the transmission?

No, it would cause the fluid to heat up and you would notice it burned color or varnish.

Roy

Okay. Thanks

You are welcome.

Always glad to help.

Roy

Would a bad shift seal leak fluid an cause transmission problems?

Only if the leak is enough to allow the fluid to be low enough that the transmission will not engage into gear.

Roy

Okay. It's not that then because it doesn't leak. Thanks

Okay, why did you ask that if it is not leaking?

Roy

Because I figured that it could make the shift loose by the seal being bad.

Lets get back to the issue.

What about the cable for shifting? you said you were going to check it and adjust it.

any results?

Roy

Haven't done it get. Don't know which direction to turn what every it is that needs to be turned. I found where to adjust it but have done it yet.

You can move it one way and drive it. You should see a difference in the shift points. if it makes the issue worse, then go back and adjust the cable the opposite direction until the shift points are correct.

Roy

Okay. I'll try it out when I can. Thanks

You are welcome.

Roy