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Old 10-07-2014, 06:59 AM   #15
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Overdrive. Should I use it?

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awesome!!! Which airstream is that?
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Old 10-07-2014, 07:03 AM   #16
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I've skimmed through the thread and am going to give my answer which may already agree with some of what was posted above:

1. Read your owner's manual and follow any advice it gives. (Often, though, these tell you what the switch does without telling you when or why to use it.)

2. Failing that, the safest thing to do is turn the overdrive off (i.e., hit the button or switch). This locks out the overdrive gear and may also affect how it shifts, when it shifts, etc.

3. If you're on level land, just rolling along, it's probably safe to re-engage overdrive and get slightly better fuel mileage. I never did with my motorhome though.

4. Here's the real key: If the transmission is hunting between gears, turn off overdrive. If it's hunting between 3rd and 2nd, downshift manually to second. For my motorhome, I always towed with overdrive off; and once or twice I found myself downshifting into second.

Just in case it's not clear - "hunting" in this case means it downshifts, then a moment later upshifts again because of the speed, then the engine can't generate enough power, so it downshifts again and the cycle repeats. This is really hard on the transmission. Don't let it do it.
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Old 10-07-2014, 07:19 AM   #17
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awesome!!! Which airstream is that?
Thanks

Abby is a 1972 29' Ambassador.
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Old 10-07-2014, 07:20 AM   #18
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Owner's manual

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Originally Posted by Skater View Post
I've skimmed through the thread and am going to give my answer which may already agree with some of what was posted above:

1. Read your owner's manual and follow any advice it gives. (Often, though, these tell you what the switch does without telling you when or why to use it.)

2. Failing that, the safest thing to do is turn the overdrive off (i.e., hit the button or switch). This locks out the overdrive gear and may also affect how it shifts, when it shifts, etc.

3. If you're on level land, just rolling along, it's probably safe to re-engage overdrive and get slightly better fuel mileage. I never did with my motorhome though.

4. Here's the real key: If the transmission is hunting between gears, turn off overdrive. If it's hunting between 3rd and 2nd, downshift manually to second. For my motorhome, I always towed with overdrive off; and once or twice I found myself downshifting into second.

Just in case it's not clear - "hunting" in this case means it downshifts, then a moment later upshifts again because of the speed, then the engine can't generate enough power, so it downshifts again and the cycle repeats. This is really hard on the transmission. Don't let it do it.
Good advice.

The Sequoia owner's manual specifically states to turn OD OFF while towing.
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Old 10-08-2014, 04:08 PM   #19
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Hey any one knows about a Jeep grand wagoneer? I don't have an owner Mabel?


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Old 10-08-2014, 04:47 PM   #20
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The 84-91's have a three speed automatic with lockup torque converter. Tow in "d".

The 1993 Grand Waggy ZJ has a four-speed transmission. In general, as stated above, defeating od will allow the drivetrain to deliver "direct" drive 1.1 rotation to the axle, thus reducing the tendency to lug the engine or force downshifts. Try to keep the converter locked, thus reducing slippage, thus heat transmitted to the fluid, which has to be mitigated by the cooling package.
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Old 10-08-2014, 04:58 PM   #21
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Sorry Manuel.


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Old 10-08-2014, 04:59 PM   #22
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Thanks! And yes I have that.


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