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your best bet for tranny control is...........YOU
When I'm towing, I"m constantly watching gauges & listening to what the system is doing and actively doing my best to anticipate what's needed for that......"hill ahead".
Heck, even in town on flat ground running empty I sometimes take it out of overdrive as I don't want it hitting overdrive just 100ft before I need to slow down again for next light.
However, if you're the type that doesn't want to be that involved with the rig over a trip, and would prefer to blast the tunes, roll down the window and not concentrate that hard except enough to steer the vehicle, then OD off is the ticket for you.
So.....................again, your best bet is,...use your judgment. Become one with your rig and you'll be fine. I tow 12klbs through the mountains and am confident with it. I think I would even tackle 15klbs although I think that would be getting near past what I could ask from my truck even as confident/good as driver as I am.
best of luck
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 y2k F250 7.3 psd Calif emissions, ext cab long bed 265/75/R16 E rated tires, 190k miles 4x4 (nv271 manual t-case) 7.3 #1247981 1/18/00 (forged rods), 3.73LSD, non-diode 4R100, Dp tuner stock, 60t 60e 80t 80e, high idle. DIY 6637 air filter, wicked wheel, turbo master WG controller, turbo lifesaver, bellowed uppies, 4" downpipe & exhaust, 203t-stat, triple pod glowshift gauges (egt, tranny, boost), Ride-rite 2330 air bags, BTS VB, Sports a Western plow when the white stuff flies.
Trailers:
I'm usually towing 1 of several trailers I've built.
15ft car hauler (1000lbs empty; 5500lbs loaded)
26ft deck over car hauler (2000lbs empty; 7k loaded)
36ft car hauler (Was tongue pull; have since converted into 5er'. 4500lbs empty; 14k loaded)
https://lh5.googleusercontent.com/-g...0/IMG_4130.JPG
Last edited by knoweigh; 11-20-2008 at 08:38 PM.
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