stereoguy

I have heard it is bad to flat tow your truck without disconnecting the drive shaft. Why? And what will it do? I have the Marlin dual case setup, couldn't I just put everything in neutral?

waskillywabbit

iTrader: (-1)

Ask ocdropzone about doing such things. He learned the hard way.

:wabbit2:

stereoguy

normally I use a car/truck dolly . So only the rear wheels are on the ground , is that Ok? My truck has a spool in the rear too ,should I be disconnecting the rear driveshaft?

waskillywabbit

iTrader: (-1)

Cliff notes: Do not flat tow without removing the rear drive shaft or you'll be sorry.

:wabbit2:

xxxtreme22r

nope that would be the same thing towing the truck flat with the hubs unlocked.

IIRC it has something to do with the way the transfercase bearings are lubricated and the engine has to be turning the front transfercase bearings in order to lubricate the rear transfercase bearings. Since the engine is not running the rear bearings of the transfer case would not be getting lubed but would still be turning even with the transfer case in N.

If I am wrong please someone correct me.

I think for this same reason is why it's not good to drive downhill with the clutch in or the transmission in neutral.

E-ROC

always pull the driveshaft. without the vehicle running in gear the gears cant fling the oil to all parts of the t-case or tranny. this is twice as good to do if you use a dolly for that tiny chance that your t-case jumps to 4 wheel drive. that would be a disaster to see!

waskillywabbit

iTrader: (-1)

Yep. Still turning even in neutral but without lubrication tcase bearings go boom, wallet goes pow, unhappy camper

Remove rear dshaft or full floater rear with manual hubs

:wabbit2:

xxxtreme22r

on a side note, with your rear case in N your front case will be safe, but not the rear one.

xxxtreme22r

what I am curious about if I am thinking correctly, is if the rig has ADD and the xfercase is in 4wd when flat towing, since the one front cv shaft spins all the time if it's safe to tow, at least on the transfercase. Or does the transmission has the same type of issue without the engine turning.

Or am I completely wrong thinking the one ADD shaft spins full time to begin with.


EDIT: would this be the same case if the trans is in N and the front hubs are locked and the x-fer was in 4wd? Although I know it's not a good thing to be in 4wd on a high traction surface either.

MudHippy

Well, I've gone over my notes carefully and have come to a conclusion. This only applies to the transfer cases that I have a full working knowledge of, having disassembled and rebuilt mine on a couple of occasions. That would be the VF1A or VF2A, mine's a VF1A but the VF2A is nearly identical. I have almost no knowledge of the inner workings of gear drive transfer cases, so this may or may not apply to those.

Both the VF1A and VF2A are chain drive, and both have an oil pump that's driven by a sprocket on the transfer case input shaft. The only way to prevent the input shaft from turning in relation to the output shaft, and thus preventing the oil pump from being driven, is to put the transfer case in neutral. So if you were to leave the transfer case in gear(ie 2H, or 4H/4L with the hubs unlocked) while being flat towed(or towed on a front wheels only dolly), and put the transmission in neutral instead, the oil pump will still pump oil to all the bearings and other parts that need lubricated while the transfer case is in operation.

I had no time to think this through when I towed my rig on a dolly some time ago, so I went ahead and removed the rear driveshaft as a precaution.

little_93_pickup

i work for a towing company and i've never heard of this.

xxxtreme22r

I have worked for a transmission shop and can see what happens to a transmission when an SUV is flat towed behind a camper for 1500 miles. Granted I think is was a nissan but.....

I don't see a 20 minute tow across town is gonna hurt anything though as you never see a tow truck driver disconnect a driveshaft to repo a vehicle etc.

4Crawler

iTrader: (3)

See 2nd Q&A below:
- http://www.4crawler.com/4x4/TLCA_Tru...ech.05.03.html

I got it straight from Marlin that the input shaft spinning is what moves oil around, so the case should at least be in 2H, trans in N. But best/safest is rear drive shaft removed and/or rear F/F w/ hubs unlocked. And have heard of folks flat towing with shaft in and having no issues but have also heard of things going bang like that.

I know on my FWD VW, that they have a similar situation with the transaxle. If flat towing and trans. in N, you are not circulating oil and they recommend no more than about 50 miles towing like that (front/drive wheels on ground).

stereoguy

I don't tow a lot but Ive only towed it to silver lake last year and its about 120 miles each way the rest of the time I use a trailer. So far so good I hope I didn't mess anything up . THANKS a lot for the info I plan to tow this a lot this year and would have screwed my transfer case up!! I cant believe I have never heard of this before .

diablo

yOU CAN BUY A DRIVESHAFT DICONNECT, SO AS TO MAKE LESS OF A PAIN IN THE YOU KNOW WHAT

MudHippy

^^ Dude...what's with the yelling? Caps lock off please. Thanks!

xxxtreme22r

for $750 I will buy a 10mm socket, a snapon ratchet and a 10mm box end wrench and take off 8 bolts myself. Might be 12mm I forget, but everyone gets the point lol.

http://www.remcotowing.com/remco_drive_shaft_coupling

MudHippy

Point taken. But for the record it's a 14mm.

And the one you want is this one for $429. http://frontrangeoffroadfab.com/nfos...87f97c6a1ab4c0 and http://www.lowrangeoffroad.com/rear-..._store=default

xxxtreme22r

haha I knew I was gonna get for the correct bolt size. I like that FROR disconnect better than the one I goggled up. With that one I wouldn't have to even get my lazy butt under the truck. LMAO.

Plus that one gives you the option on doing front digs on the fly.

EDIT: I must have given wabbit an idea. lol

https://www.yotatech.com/forums/f109...omatic-227639/

waskillywabbit

iTrader: (-1)

I actually have one of these for a 96-02 4WD 4Runner Automatic

Acutally driveshaft bolt heads can be 12mm or 14mm depending on year, but sometimes they are mixed and matched.

:wabbit2: