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if A/T is this the 42RE box>? are you in DRIVE? or 1 or 2 gear.
does rpm rise above 3000 rpm > at your attempt? if not ,its a bad engine (weak)
is the shift linkage even shifting correctly (movement top and bottom)
check levels yet. (and for pink ./red AFT not black-metal flake
change the filter yet? or skip service. at 50k miles. ?????
check all fuses yet>?
using a basic OBD2 scan tool are there any tranny DTC errors?>
does the FSM stall test pass? in 1st.? and reverse?
if stall fails, slips , then tranny bad. if not its really stuck in 1st gear.
The TCM commads the gear change, there is no valve body brain.
the TCM shifts to second with good inputs to the TCM
if the TCM sees bad inputs it will tell you, SCAN IT.
as a quick remedy 1st check your fluid make sure is clean and leveled/adjust your kick down cable for early shifting by loosening the cable till you establish the right shifting
Check the Trans fluid level with it running and at operating temperature. Jeep NAG1 transmissions are known to have the input electric seal leak trans fluid. Not an exspensive fix add Mopar ATF4 and then relace the guild seal.
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