Welcome on board

 

2014 Silverado with 5.3 and 125000 miles

just had a tune up done, new plugs (iridium), new wires, new coils, new pcv valve, cleaned throttle body and cleaned mass air flow sensor, along with a few other items, but nothing related to the engine or transmission.

Since the tune up, the transmission has been shifting VERY hard, but only when hot.

I just took the truck on a road trip, roughly 3 hour drive all highway, and when I exited the highway the downshifting thru all gears feels like it’s slamming thru the gears. Same when accelerating.

No check engine lights are showing on dash.

is this normal? Will this go away? Did the time up mess something up?

Welcome in. I responded to the issue you were having with your 2014 in the other thread you made.

 

ive made 1 thread
i have no issues
not sure what youre referencing

 

Hey all,
friend mentioned this forum, and i didnt know i signed up while i was in iraq..

forgot all about it

Here i am again.

My 2014...

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like the new avatar . Maybe post those pic's ??