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Old 12-10-2012, 01:26 PM   #15
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Location: Arizona West RV Park, Yuma, Az
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To the OP. If your F53 chassis (Ford) is a '98 thru '03, you have a 4R100 transmission. It is a 4 speed, automatic, of course. Since it is an automatic, it does everything it needs to do without any help from you. OD is nothing but 4th gear (why mfgs call it that is beyond me and just causes confusion).

Anyway, just forget about it. Now, if you are an old manual trans guy, then you know when you go down steep grades, dropping the trans from 4th to 3rd will slow you down and help from burning up your brakes. It's no different with an automatic, except an automatic will not downshift on down grades, only up grades. So that is the reason it is there if you want it. Same reason most auto shifters have 1,2,3, so you can downshift manually.

If you have a '04 thru '10, then you have a 5R110, which is a 5 speed automatic. Begining in 2011 all trans are 6R140. These are 6 speed automatics. Both of these trans' do not have a so called OD. They have Tow/Haul modes.

Tow haul mode, changes the shift strategy, and raises the line pressure, to reduce the chance of slippage, causing heat build up. It is recomended always when towing or hauling.

Unlike the older 4R100, when the trans had OD, the old version simply turned off the OD (or just dropped to 3rd). The new design, doesnt have the OD but more gear(s), and the tow haul mode switch. This just changes the perameters of the shift requirements (doesn't simply drop a gear). It holds gears longer, downshifting earlier, not unlocking the converter, on decents, down long hills reducing brake fade. It's just a smarter more automatic transmission designed for heavy duty trucks.

John & Clare Lyon
2007 43.5' Monaco Dynasty Palace III (All Electric)
Towd: 2011 Chevy Equinox
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Old 12-10-2012, 01:43 PM   #16
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Workhorse Chassis Owner
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Location: Michigan
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Originally Posted by wa8yxm View Post
The rule for overdrive is fairly simple.. Turn it on.

When you start out from a dead stop overdrive is disabled anyway so there is no need to turn it off.. As the transmission runs through the gears OD is disabled so there is no need to turn it off.

Once the transmission hits top gear OD is activated, IF it is turned on.

IF, you are crusing down the freeway and the tranny is staying in the same gear, the tac needle looks like it is stuck in position .. Leave it on

If, on the other hand the tranny is shifting up/down/up/down, the tac is jumping up (As the tranny shifts down) down/up down (not a wiggle but a serious jump) TURN IT OFF.

In short, anytime the transmission holds top gears without "Hunting".. You leave it on.. If the tranny starts "Hunting" for the proper gear, turn it off.

Steve & Sally / Hudson Our Little Pom / Heidi, Houston & HiTee Forever in our Hearts
04 NEWMAR MACA 3778 W22 / 05 PT Vert
Michigan (Summer) Michigan (Winter For Now)
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Old 12-11-2012, 07:58 PM   #17
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I had an 02 37' M.H. w/v10 Ford. It had an O.D. button. I would shift out of O.D. in the hilly area and or mountains. I would get between 7-7.5 m.p.g. doing this. I now have an 08, 37' M.H. w/v10 and the tranny has a tow/haul mode. I started out doing the same as before but noticed it ran well staying in tow/haul all the time. It smooths out the shifting and also downshifts automatically in tow/haul. I now get 8-9 m.p.g. I tow an HHR about 3200#. It saves allot of effort to just leave it in tow/haul

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