Hello e53 owners! I am having a problem with my completely stock 4.8is. 139k on the clock.

Issue: when accelerating in automatic mode, the transmission seems to sit at 3k rpms while shifting through the gears, instead of your typical 2000rpm smoothly to 3000rpm, then next gear, and so on, if that makes sense.

Another piece to add, If I am in manual mode let's say 3rd gear, trying to just use the torque of the motor from 1800rpm, it will jump to 3000, and then as the vehicle speed catches the rpm, it will then 'match' and continue in a linear fashion. This ONLY happensin the lower to middle rpms, anything above 3700 seems to not, I guess you could say, slip.

Any ideas on this? Thank you guys in advance. I love this forum.