1st post to the forum (wish it wasn't under these circumstances) hoping to use the forum to get some advise/input on current situation. Appreciate any and all feedback.
2020 Chevy TrailBoss LT 5.3L V8

Details: I bought my TrailBoss in December 2019 - today, it only has 3,335 miles and around 21hrs or so on the engine.
There have been 3 or 4 recalls & dealership service visits (annoying but ok). Now - a real issue!- on tuesday (28 July) I dropped off to dealer with these symptoms:

- (July 25th) Started up truck and backed down my sloped driveway to my cul de sac (auto) - engine revved to aprox 4200 rpm after shifting into drive & did not go forward (no gas pedal applied) - after 15 seconds or so I pressed the gas pedal and truck barely moved forward (like it was pulling a trailer but it was not under load).

- Service Engine light on

- Disabled the auto start/stop function, no real results. (still sluggish/high rpm) Hwy speed 70mph at 4200 rpms! (Called dealer from the road - setup appointment to drop it off) jerky shifting while parking up my sloped driveway.

- (July 26th) engine light on - shifted into drive (truck did not move forward) - high rpms - engine light turns off - pulled back up driveway and truck rpms revved and jerked forward.

- (July 28th) 8:30am drove the 8.2 miles to dealer (no engine light) rpms at a comfortable 1200 @ 70 mph on the freeway | check fuel light comes on with estimated 31 mile range. Did NOT stop for gas and left it with the dealer.

- (July 28th) 4:30pm service rep calls to state that my truck is the next one in line to see their transmission tech (Garrett) but it might not get seen today. [OK]

- (July 29th) no update from the dealer

-(July 30th) 8:00am I call dealer (my svc rep not there) they state that truck was out of gas and they needed to put in some fuel for a test drive and then they would get it over to their transmission guy? He says those notes were from 7:15 that morning. 3:00pm I decide to pay them a visit, service rep calls Garrett [transmission guy] directly and he states the transmission is out of the truck and he found metal shavings in the "pan" - he is ordering parts for a throttle body (for replacement)

- (July 31st) 8:30am my svc rep calls (was out last two days) and was surprised no one had called me to update - we confirmed about the throttle body and parts were going to take 4 days to arrive.



SO - any advice on this - I have read so many 8 speed transmission issues that I am concerned about what to look for/test etc once I get the truck back from the dealer. [especially metal shavings after looking at transmission]



Thanks!

 

Its been a while, but I always dumped all the fluids at 5000 miles including the axles, to get all the particles out due to break-in.

 

do you mean valve body? Thats in the transmission. Throttle body is on the engine.