Just a flash/ reprogram. What year is your vehicle? I think I read somewhere that the upgrade was only available for vehicles manufactured mid-2016 and later.
@NickTransmissions
Took it back to the transmission shop and we determined it was not a mechanical issue or related to the rebuild. They took it to the local GMC dealer for diagnosis.
Problem solved... here's from Dealer:
SCAN ALL MODULES AND CHECK FLUIDS. FOUND TRANSMISSION UP AND DOWN...
2016 Yukon XL SLT with 6L80 transmission and 97k miles.
Recently had transmission rebuilt by local shop (probably overpaid, but that's a different topic) about 1.5 months/2k miles ago.
Last night on the highway (flat Florida) at 70mph the transmission suddenly started jumping between gears...
It would appear that it's "lifetime" at this shop and on parts only as long as I own the vehicle and continue the annual service every May (30 days grace period each year)... attaching a snippet of the warranty.
I need to verify that... I have a 15-day follow up service appointment with the shop and I'll check. Question - if they didn't, is it too late at this point now that everything is reinstalled? Or can the thermostat be swapped separately?
Follow Up:
So, in the end I let the shop do the repair their way.
I would encourage anyone in my situation to discuss all the concerns @NickTransmissions brought up before letting the shop take your transmission apart. I did feel a bit held hostage at that point and continued with letting...
Well, to say I got a little pushback from the mechanic (not owner) questioning his plan would be putting it mildly. I understand he probably gets tired of internet mechanics/ experts questioning him the same way my wife hates "Dr. Google" in her medical field.
That said, he did go through...
Yes... had it all apart this morning (pics attached).
I believe FTC is their supplier. That website matches what they sent me as the specs of the new TC.
2016 Yukon XL SLT - 95k miles. 6l80 transmission - 2 nights ago felt like it was starting in 4th gear, kept changing gears on highway, clunky shifting. Took it to a local shop and was told the following:
We have thoroughly inspected your transmission. The valve body assembly (hydraulic cross...
Update: Took it to another shop that specializes in electrical systems... they load tested the battery and determined there was a bad cell. Replaced battery and all is good now!
I drove my 16 Yukon XL 5.3 two nights ago and noticed it starting sluggishly. I had a number of errands to run and it seemed to get worse every time. I left the vehicle running as I went in the store on my last errand in fear the vehicle wouldn't start again. In the way home I stopped at the...
Growing family meant selling my lifted Silverado and searching the country for the best deal on a Yukon XL. Purchased this 2016 sight unseen in Oklahoma and had it shipped. So far loving the truck. I debated on a Denali, but I'm happy with the well optioned SLT and a little extra $ in my pocket.
I installed these in the 2016 Yukon... I've been very pleased, until my wife and I swapped vehicles and I was driving in front of her. There are dark spots in the beam that appear to be from the shape of the bulb. I was able to catch a picture at a stop light:
... anyone else notice this...
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