idk what the overdrive in supras do
but i had driven two cars with overdrive
one being mine
i can drive a constant 60 mph at 4000 rpms
if i put the overdirve mine
is like a mini nos boost
cuz it jumps onto 6000 rpms
without the overdrive
my car shifts at a constant 3500 rpms
with overdrive it shifts at 6000 +
thats jus my opinion tho, maybe sumbody that knows more about this
can clarify this
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