Several issues to consider, however, with the mileage it sounds like your 2-4 band is starting to fail. Transmission rebuilder here for 30 years in nebraska have built hundreds of hurdreds 4l60e around here, over and over and over...
They are junk! I’m sure the 10 speeds will be worse. Can’t stand the constant shifting and converter clutch cycling. 4l60e’s are most reliable and maybe 6l80s with updates.
then there is the infamous transfer case oil pump housing beating its way though the rear casing slowly as the fluid all leaks out till its empty:whymewhyme:
its odd your having a no 2nd and 4th condition AND a park issue, usually those are 2 separate issues. Generally broken ring gear and planets in the trans will cause no Park with a grinding or ratching type sound when its rolling away in Park. A broken sun shell may make a grind in reverse but...
Yes, anything in the drivetrain behind the rear ring gear in the transmission (which is where the parking pawl locks)that is broke can cause no Park condition i.e. t case diff etc or a broken trans ring gear
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