Interesting, I noticed this on our last trip as well.... When accelerating hard while coasting, it feels like something in the driveline has to catch up, then it grabs and goes... Not at all like a slipping transmission... If I'm cruising along in say 3rd, and manually holding that gear, and abruptly take my foot off the gas it feels like something in the driveline has some slop to it, takes just a bit for the driveline to go against where engine rpms slow it down... Then some play again when I accelerate till it catches up the slack in the opposite direction... Gonna start with the guibos, since I've never replaced them. Work my way towards the TC chain... There are 2 guibos, correct?

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Current-

--2003 X5 4.6
Estoril Blue
Black Nappa leather
rear air bags
OEM nav
OEM hitch
OEM cargo liner
Black housing SPYDER headlights - Evo-XR projectors

2017 GMC Sierra, 7K miles...
2017 GMC Sierra, 60K miles...
2015 GMC Sierra 280K miles...
2011 GMC Sierra, 500K miles...

Previous wheels:

--First love~
1969 Chevy C10, 396BB bored, 3 on the tree, Black ~SOLD~

--2011 Chevy Silverado LT 2500HD CCSB, Black, 250K miles ~SOLD~