The governor of a TH400 I believe is what causes the 1st to 2nd up shift
when held in low range. I don't think the TH350 does. I know the 4T60E does
in my 1994 Z34, at about 6,500 rpm (it has the 3.4 DOHC) it up shifts out of
1st even when held in low range. But I imagine this one is due to computer
programming as it's electronic shift.
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