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Unread 12-17-2011, 04:15 PM   #1
Jet 4.7
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Wj 545RFE - Anyone know how to shut 5th gear for towing??

Hi Guys, I've got a bit of long distance towing to do in my 2001 4.7 w/ 545RFE gearbox, has anyone out there been able to lock out 5th and keep 4th. I'm towing 3500 - 4000lb camper and hauling in OD on and OD off modes is painful on a long trip at 55-60 mph!

Any ideas appreciated!

Jet

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Unread 12-17-2011, 04:19 PM   #2
Rocklobster
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I believe od off is what you need to be using, I think that is does not only shut off od but changes the shift points to give you a little more power.

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Unread 12-17-2011, 04:35 PM   #3
Jet 4.7
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Hey RL, thanks for the reply, agreed - but towing with OD off (3rd gear) has the rpm at about 2600 and is heavy on fuel, where as with OD on (5th gear) fuel econ is ok but no torque because of the 1600 rpm or so. 4th gear would be ideal if i could just select it!!!
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Unread 12-17-2011, 04:52 PM   #4
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Well once you get going on the highway put od back on for the long runs hills might suck tho

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Unread 12-17-2011, 04:54 PM   #5
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Your 4th gear is like a passing gear I dont think unless you reflash the tranny computer you can use it the way you think.

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Unread 12-17-2011, 04:56 PM   #6
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Unread 12-17-2011, 05:37 PM   #7
ZAM
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Are you supossed to use OD while towing? I tow my boat on average 3 times a week (2500lbs) and I don't do anything differently, just put it in drive. I've been doing it for years with no problem. it may be the wrong way though, Im not sure
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Unread 12-17-2011, 09:23 PM   #8
chrisstromberg
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I turn off OD for towing when I'm climbing hills, but if I'm cruising on a flat highway (Kansas), I drive like normal.
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Unread 12-17-2011, 10:04 PM   #9
mycreativename
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Quote:
Originally Posted by ZAM
Are you supossed to use OD while towing? I tow my boat on average 3 times a week (2500lbs) and I don't do anything differently, just put it in drive. I've been doing it for years with no problem. it may be the wrong way though, Im not sure
You're not supposed to use OD when towing, as the constant shifting that the auto tranny will want to do between OD and actual gears will heat the transmission right up, and as we know, heat is the enemy when it comes to transmissions.

However, many just turn their OD off when in hilly terrain/city/areas where the strain on the engine will change, and leave OD on when towing across a flat surface at a constant speed.

Long story short, you'll be fine with OD on as long as your transmission isn't hunting for gears, if you notice it shifting up, down, down, up, etc take it out of OD.
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Unread 12-17-2011, 10:45 PM   #10
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i think hes asking how to turn the od off. not whether he should drive with it on. is there a button somewhete?

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Unread 12-17-2011, 11:04 PM   #11
mycreativename
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Quote:
Originally Posted by gphunkplp
i think hes asking how to turn the od off. not whether he should drive with it on. is there a button somewhete?
I wasn't responding to the OP, I was responding to ZAM.

Yes there is a button right on your shifter to turn OD on or off.
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Unread 12-20-2011, 01:06 AM   #12
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As far as I've ever seen, there is no choice to be able to select 4th gear with the 545. If it is possible to flash to 45RFE software, you'll lose the 5th gear, but Im not sure if its even possible to downgrade.
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Unread 12-20-2011, 01:49 AM   #13
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get a manual tranny.
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Unread 12-20-2011, 03:08 AM   #14
ratmonkey
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od off, except when on long stretches of flat highway at constant speed.

od off also allows the torque converter to lock in 3rd gear, keeping the heat soak in the trans down even more.
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Unread 12-20-2011, 07:24 AM   #15
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Did you really not know where the button is?
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