As stated--depends on your tow rig.
I towed boats over 40000 miles in a year with my Tahoe, boats from 20 to 27', and always left in overdrive. The computer will tell the tranny what gear it needs to be in.
PS-That is the factory trans in the Tahoe with 188,000 miles, serviced every 30,000 though.
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 88 V-20
200 G2
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