Mustang has been running perfect

pulled into garage last friday

shaker 1000 amps in trunk have not worked for years

decided to pull relays related then all fuses one at a time and look at them in under hood fuse block
all good
put them back

started car...runs

but wtf put transmission into reverse or drive or any gear

NOTHING

wont move...well its a 4350lb rolling paperweight....
HELP

its not leaking

fluid was changed recently