Judder between 20-40 MPH and 1000-1500 RPMs

[BWesley]

2019 Tahoe LT - 89k miles…all of a sudden last week there has been a judder between 20-40 mph and 1000-1500 rpms. There have been no warning lights, no change in acceleration or shifting in transmission…had it in the shop the last 3 days and they were able to duplicate the problem when driving it, but couldn’t duplicate it in the bay while it was hooked up to the computer to diagnose the problem. They think it might be the vacuum pump but aren’t 100% sure. Anyone else here had this issue? I couldn’t upload the video so the link below is the reel I shared on a FB post

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[petethepug]

@Fless req xfer to gen 4 forum … damn that was fast

 

[NickTransmissions]

2019 Tahoe LT - 89k miles…all of a sudden last week there has been a judder

Judder?

Do you mean to say "shudder" as in torque converter shudder?

 

[tom3]

I'd suggest getting the pan off the transmission quick. See what's in the bottom and how the fluid looks. You might be able to save the transmission at this point - if that's the problem.