I've never heard of adjusting that before either, but, none-the-less, it is in the manual.
The following is copy-n-paste from a '01 Dakota manual, but, is word-for-word the same as found in my '96 Dakota's manual. It fits both the 42RE and 46RE.
As far as special tool C-3763, couldn't help ya there. (Special tools are [:'(])

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yeah, thats the same exact page i have from ALLDATA....i guess i'll have to get under there and try it out....thank you