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Marshall,
That's probably because you have the 4L80E trans and a 4.10:1 rear. I've got a '98 K2500 HD w/ a Vortec 350 w/ the 4L80E trans, and IIRC, it says to tow in OD. Prior to that, I had an '89 K1500 TBI 350 w/ a 3.42:1 rear and a 700R4 trans. No way would I try to tow anything but an empty open trailer in OD. The motors made no power (225hp stock) and those trannys sucked!
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This is interesting, the owners manual for my '95 K2500 Suburban, 454/4L80E/4.10 rear says to tow in (3). That being said, I've tried it and for my needs OD works fine. I'm only towing a 2300 lbs car on a 800 lbs dolly, if I had a large trailer I would reevaluate things though.