Ugh, did I screw up my transmission fixing a pan leak?

[Zeus3k]

All, I have a 2001 Yukon XL with 4I60E transmission. I did a complete transmission flush about 5k miles ago and the truck has been doing great. The only issue was an oil leak from the pan. I finally decided to go at the leak and lowered the pan. I couldn't get the pan completely off, but was able to unbolt shift linkage, and move pan enough to replace the gasket. I reassembled everything, but now the truck won't go in reverse, and when in drive it has a hard time shifting into second. What did I do? It was working well before and immediate after, it's not. I'm wondering if something got damaged when I was moving the pan back and forth trying to get it off. Shift linkage looks good. Anyone have any suggestions on what I should look at? Some online videos suggest checking fuses, but all of the Ignition 10A fuses look good. Also of note, I did replace some of the transmission fluid again.

 

[OR VietVet]

I bet the shift linkage is where the problem is. Other transmission people will chime in. Hopefully @rockola1971 will chime in.

 

[rockola1971]

You moved your shifty cable at its adjustment point. Skip to: 8:48

 

[Zeus3k]

I appreciate all the help all! I verified that both the truck and transmission are in park. I also tried to see if there were any other adjustments, but nothing. Now the transmission won't engage at all. Not even in Drive. The dashboard does indicate me shifting through the positions as I move the shifter. I put a camera under the truck as I shifted and it looked correct. No computer codes. Anything else I can check? I was going to upload video of the shifter linkage going through the various points, but it says file is too large.

 

[Fless]

I appreciate all the help all! I verified that both the truck and transmission are in park. I also tried to see if there were any other adjustments, but nothing. Now the transmission won't engage at all. Not even in Drive. The dashboard does indicate me shifting through the positions as I move the shifter. I put a camera under the truck as I shifted and it looked correct. No computer codes. Anything else I can check? I was going to upload video of the shifter linkage going through the various points, but it says file is too large.

TYF can't host video. You need to put it on YouTube or another host site, and post a link to it in your thread.

 

[Blackcar]

Sliding pan around trying to work gasket in may have pulled a servo wire or broke connector. You didn't have problem until working on transmission.

 

[rockola1971]

Sliding pan around trying to work gasket in may have pulled a servo wire or broke connector. You didn't have problem until working on transmission.

Servos dont have wires. They are 100% hydraulically operated. Shift solenoids do however have wiring but unlikely to have done anything to them by just moving around the pan.

 

[Blackcar]

Servos dont have wires. They are 100% hydraulically operated. Shift solenoids do however have wiring but unlikely to have done anything to them by just moving around the pan.

Yep, didn't type what I was thinking

 

[swathdiver]

Bent or disconnected the shift linkage inside the pan.

 

[mrhp]

I’ll bet disconnected a plug unintentionally under the pan. Had one of my mechanics do that years ago.