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Can you Flat tow(4 wheels on the ground behind an RV) a Fj without harm? I was hoping to get a mechanic to post on this one. I know the owners manual says you can't but from what I have read it is because Toyota has not wanted to deal with Flat Towing. Many other makes are now stating that auto trans with 4x4 and a transfer case can be flat towed(ford, Dodge, Chevy) by shifting transfer into into nuetral. Is there really any reason that an FJ can not?
 

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The short answer is no.

If you have about $1100.00 the FJ can be modified to be flat towed but the warranty will be effected.

If flat towing is a priority...Jeep would be your brand:)

Doc
 

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Some transfer cases don't have enough lubrication while being towed. That unfortunately includes the FJ.

If it's a auto with the part time case a Remco Drive Shaft Coupling should solve the problem. I think they are around $1K. Manual with a full time case would need the Remco and a tow dolly.

Or if you're cheap, remove the driveshaft(s).
 

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Some transfer cases don't have enough lubrication while being towed. That unfortunately includes the FJ.
So the engine lubricates the transfer case? If so, then what if you just leave the engine running while towing and the transfer case in "N" position...the FJ sips very little fuel while in idle.
I am not saying I would do this, nor do I recommend it, but is it theoretically possible?
 

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what if you just leave the engine running while towing and the transfer case in "N" position
I haven't been inside a FJ case to be sure but it's possible. It's like coasting down a long hill. There are many people doing this with other makes of 2wd leaving the trans in N. The trans would have to be in D on a 4wd for it to spin the input of the transfer case. Not sure how the electronic controls and nanny systems would like it.
 

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So the engine lubricates the transfer case? If so, then what if you just leave the engine running while towing and the transfer case in "N" position...the FJ sips very little fuel while in idle.
I am not saying I would do this, nor do I recommend it, but is it theoretically possible?
???
???
???
The engine lubricates the tranfer case??? I don't think so.:worried:
 

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Some transfer cases don't have enough lubrication while being towed. That unfortunately includes the FJ.
So the engine lubricates the transfer case? If so, then what if you just leave the engine running while towing and the transfer case in "N" position...the FJ sips very little fuel while in idle.
I am not saying I would do this, nor do I recommend it, but is it theoretically possible?
The engine lubricates the tranfer case??? I don't think so.:worried:
Well, then what is the difference between driving the Fj and towing the FJ with transfer case in "N" position.
I don't have money for an RV to tow my FJ, but I'd still like to know why I could not just put my 6MT FJ's transfer case in "N" and tow it?
 

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So the engine lubricates the transfer case? If so, then what if you just leave the engine running while towing and the transfer case in "N" position...the FJ sips very little fuel while in idle.
I am not saying I would do this, nor do I recommend it, but is it theoretically possible?
The engine doesn't lubricate the transfer case. The gears in the transfer case slosh the fluid around, providing lubrication to all components. If you tow in neutral, some components are not spinning and sloshing.

If "slosh" isn't the technical term, someone help me out :)

I find it amusing that someone would ignore the owner's manual and take advice from the internet. You can keep asking, and eventually someone will say "I'm a mechanic and its perfectly fine to flat-tow your FJ".
 

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Well, then what is the difference between driving the Fj and towing the FJ with transfer case in "N" position.
I don't have money for an RV to tow my FJ, but I'd still like to know why I could not just put my 6MT FJ's transfer case in "N" and tow it?
There's no oil pump in the 5AT's Part Time transfer case. It relies on splash lubrication. When you are driving down the road, the gears are partially submerged in the gear lube and they 'splash' lubricant everywhere inside of the case. When the TC is in neutral the gears are not spinning in the lube, therefore no splash lubrication; but, your rear output shaft is spinning at highway speeds. You risk burning up that bearing and having it seize causing all sorts of havoc.

DEWFPO
 

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The engine doesn't lubricate the transfer case. The gears in the transfer case slosh the fluid around, providing lubrication to all components. If you tow in neutral, some components are not spinning and sloshing.

If "slosh" isn't the technical term, someone help me out :)

I find it amusing that someone would ignore the owner's manual and take advice from the internet. You can keep asking, and eventually someone will say "I'm a mechanic and its perfectly fine to flat-tow your FJ".
Again..to iterate from above...I only understood what I read and asked what the difference is....I never said I intended to flat tow my FJ ( the OP did ), I only wanted to know why it can't be done.
I know what the manual says, and I am probably one of the few people on this forum that actually read it and didn't have to ask here how to open the rear window :lol: But as I asked before, I just wanted to know why.

So you say some gears will rotate, while others of coarse won't (logical since in "N"). But, why does it matter if some of the gears are moving while others aren't, so long as the gears in movement have lubrication. I just want to understand why this is not possible, since I have seen so many people tow jeeps w/o modification.

I remember my dad used to tow our 4x4 with our RV when I was little and it wasn't modified. So what has changed over 25 years in a Manual Transmission vehicle that it no longer allows you to tow it w/o modifications.

Please explain this for those of use that might not understand the mechanicals of the FJ as others do. Thanks.
 

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There's no oil pump in the 5AT's Part Time transfer case. It relies on splash lubrication. When you are driving down the road, the gears are partially submerged in the gear lube and they 'splash' lubricant everywhere inside of the case. When the TC is in neutral the gears are not spinning in the lube, therefore no splash lubrication; but, your rear output shaft is spinning at highway speeds. You risk burning up that bearing and having it seize causing all sorts of havoc.

DEWFPO
Finally an answer that makes some sense to me...so what if a 6MT's transmission is left in "N", but the transfer case left in gear...this way the transfer case is still rotating and splashing gears. What is the risk then?
 

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Finally an answer that makes some sense to me...so what if a 6MT's transmission is left in "N", but the transfer case left in gear...this way the transfer case is still rotating and splashing gears. What is the risk then?
That's a very interesting proposition. Theoretically the transfer case gears will be spinning and hence getting lubricated, and the rear output shaft of the 6MT will be spinning possibly causing some lubrication. I don't know enough about 6MT in the FJ and the Full-Time 4WD transfer case and how the Gleason-Torsen differential gets lubricated. Someone more knowledgeable than I will have to answer this one.

DEWFPO
 

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DEWFPO is correct the FJ is not towable 4 down unless you use Remco's solution and buy there drive shaft coupler which you have to shorten the drive shaft and install there coupler to tow the AT 4 down, Remco does not have a solution for the 6MT FJ at this time. I bought a trailer to haul my AT FJ behind my Motor Home.
 

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Finally found a very logical answer to my 6MT question...this makes sense to me...
Read it as you wish.

From ih8mud.com posted back in '07
77FJ40-07FJC said:
Here are the results of my test run towing my FJ Cruiser.
This is my opinion of what I did, and it is NOT A RECOMMENDATION.

After extensive studies I confer with Toyota that I too would most definitively publish the FJ Cruiser as not designed to be towed. It is true, it was NOT designed to be towed, but I found that I can tow my manual 6 speed version safely. ..I need to explain that, don’t I?

The problem is, from a manufacturer’s perspective the chances of an owner towing the Cruiser incorrectly is far too likely. They would suffer numerous cases of drive train damage with the owners claiming they towed correctly and would suffer a lightning fast reputation of having a crappy transmission, … (hey, you guys said it could be towed). The answer is to simply state that FJ Cruisers are not designed to be towed. Now, when someone tows one incorrectly they are on their own. This is very wise of Toyota.

Why is it so likely that an owner would tow one incorrectly? Well, in the past we have become accustomed to towing manual transmission 4x4’s with both the diff and the tranny in neutral. This would be disastrous to the drive train of the FJ Crusier… (thus Toyota’s response). Most idiots would read the part that says it can be towed and go do just that… am I right??? .. never bothering to read how because it is a 4x4 that can be towed….. WRONG!!!!

The transfer case differential in the FJ Cruiser is not like those we have used in the past. The transfer differential is locked in HL (high locked), N (neutral), and LL (low locked). This differential is only unlocked (active) when the transfer case’s shift lever is in the H (highway) position. While in the N position the transfer case does not transfer power from the transmission to the drive shafts, BUT the transfer case’s differential is locked, I can not stress this point enough. This means on pavement the gears will bind up if you do not have the transfer case shift lever in the H position… the exact same thing is true while you drive the FJ Cruiser.

I have now towed my manual 6 speed FJ Cruiser for hundreds of miles with zero damage. I am now convinced that the drive train spins and oils just as it would if it were being powered by the engine. While being towed the primary input shaft of the transmission is not spinning but I believe it is being splashed by sling oil from the secondary (output) shaft. Besides, a non spinning shaft does not need to be lubricated my flowing gear grease….. it isn’t doing any work.

I confirmed this oiled theory by stopping and feeling the transfer case, transmission, and rear members often for many miles to see how the heat was handled and spread. During this control group test, they all warmed just the same to the sense of touch as when being powered by the engine. (The pain threshold of touch with the hand is 130°f.) The members never reached a point in which I could not keep my hands on them for several seconds, (the powered and towed results had no recognizable differences). Plus, the transmission warmed from one end to the other and from top to bottom evenly, this can only be done if the oil is being slung by the spinning secondary (output) shaft in gear grease, bathing the entire inside of the transmission.

Clearly, I will flat tow my FJ Cruiser many times in the future and will expect to get slightly less wear (less work load, they are only spinning their own mass) while in tow than while driving the same miles under power.

I do not recommend that anyone tow their FJ Cruiser for the same reasons I believe that Toyota states they are not designed to be towed. You must make your own decision. If you do tow yours you must understand the severe consequences of placing the transfer case in any other than the H position. You get ZERO CHANCES to make a mistake here … not a task to perform with a beer in the other hand.

To my knowledge the only way to tow ANY automatic transmission powered FJ Cruiser is to have “quick disconnects” installed on the drive shafts, or to remove the drive shafts.

Also, realize, in nearly all states you will be required to have a brake away system to lock the brakes if the tow bar separates. …and …in nearly all states you must have a method that will apply the brakes of the FJ Cruiser if your towing vehicle makes a hard stop.

Now, do you blame Toyota for stating that the FJ Cruiser is not designed to be towed???
I most certainly would have done the same!!!!! AND.. it was NOT designed to be towed, or the transfer case would unlock the differential while the shift lever is in the neutral position.


..added in... when being towed with the key in the acc position to unlock steering, the Odometer did not registor milage.
and

77FJ40-07FJC said:
Returned from another extensive trip towing my manual trans FJ Cruiser with no problems. Total towed miles to date... geeeze ... 7-8K
So in other words a 6MT must be in "H" on the transfer case, but "N" on the transmission...But as this posted stated, Toyota doesn't recommend it, because it would be very easy to screw up and put the TC in "N" and thus they would be liable...Toyota doesn't want to be liable, so they say no.
 

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So let me get this straight, I can indeed flat tow my 2007 ('08 or '09) 4WD Automatic Transmission FJ if I use the Remco Drive shaft Coupling unit (Part #:Measure SKU-3, Price: $1,150.00)?

Has anyone done this?

Thanks...

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So let me get this straight, I can indeed flat tow my 2007 ('08 or '09) 4WD Automatic Transmission FJ if I use the Remco Drive shaft Coupling unit (Part #:Measure SKU-3, Price: $1,150.00)?

Has anyone done this?

Thanks...

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It is true, My dad flat towed his Land cruisers and "lexus" Cruisers behind his motor coach utilizing remco drive shaft disconnects. He never had an issue.

IMO: This solution is too expensive by the time that you add in a hitch and labor to install.

Doc
 

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Great, thanks for the info Doc.

:bigthumb:

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