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Drivetrain play/wear, differential?

Rhino

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#1
My 2020 Explorer ST has 37,000 miles on it. Some background mods for reference... Ford tune, 50/50 blow-off valve, high-flow air filter, oil catch can/air-oil separator and MBRP axle back exhaust.
So I've noticed under light throttle what feels like final drive wear. There is a slight delay just after an upshift. I can feel it in the seat, meaning I'm unable to determine at this time if it is coming from the front, rear or center. I wonder if this is a precursor to the rear differential issues I'm hearing about? I did do a transmission fluid and filter service and nothing abnormal was found (The issue was happening before this service). Any input is greatly appreciated!!!
 

2020FordRaptor

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#2
Is the vehicle up to operating temperature? What gear is it doing it in and under what throttle conditions? Any Ford 10-speed shifts very funky when cold or under odd throttle inputs.
 

OP
R

Rhino

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Thread Starter #3
Thanks for the response. I do notice it more at operating temperature. Light throttle and upshifts only. I feel like the shift quality was great for about 36,000 miles, now at about 37,000 miles. The Ford tune has been on for about 4,000 miles. I guess I'm looking for someone who has experienced this exact issue or a Ford tech on here. I'm an auto tech myself so I can speculate all day hahaha. I'm under the powertrain warranty until mid-April of this year... Coming up fast! So I'll have to get it on the lift and see if there is anything obvious then take it into Ford.
 

2020FordRaptor

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#4
Could try resetting adaptive transmission learning.
 



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