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RodVT
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Member # 41913
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Reged: 04/14/04
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Loc: Vermont
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2 Wheel drive, LOW range?
#1858004 - 06/19/04 10:53 AM
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Occaisionally I am backing a car on my wrecker up hill and I stall my IDI. Rather than smoke the clutch trying to feather it up the hill, I have been shifting into low range without locking in the front hubs. Someone once suggested to me that this would be a good way to crack my transfer case apart, due to the unbalanced load. I have never torn one apart so I really don't know how different the (for lack of a better word) "torque paths" are (2WD vs. 4WD). Anyone have any thoughts?
Thanks,
Rod
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dieselturtle
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Re: 2 Wheel drive, LOW range?
#1858051 - 06/19/04 11:33 AM
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If you're light on the throttle you'll see no damage to your driveline.
Power goes thru tranny/rangebox of the t-case to rear axle and via chain in the t-case to the front axle. One open hub means no power to the front wheels unless you have a locker. If you backup a straight line you can keep your hubs engaged to get some more traction.
Klaus 
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Lucky_LaRue
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Re: 2 Wheel drive, LOW range?
#1858237 - 06/19/04 03:11 PM
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I do this when I am backing my 30ft 5th wheeler, also you can use low range if you need some real pulling power on a steep hill.
Sent you a E-mail about your flywheel.
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Phil D.
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Re: 2 Wheel drive, LOW range?
#1858240 - 06/19/04 03:13 PM
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If you've got a load, and are on pavement, DON'T use 4wd.
You're going to bind up something.
I've used 2WD periodically to move large, unstable loads (like hay-bales) that I have no reason to jerk around.
I'd be nervous about an automatic tranny, but with a standard, you can feel the driveline and make sure not to dump too much into it at once.
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agnem
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Re: 2 Wheel drive, LOW range?
#1858294 - 06/19/04 04:11 PM
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I think he said he is doing this with the hubs unlocked. This is fine. I've done it many times. Whoever told you about cracking the transfer case or whatever, must have believed you were using 4X4 lo with the hubs locked. 4X4 with the hubs locked is never a good idea on pavement.
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JPR
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Re: 2 Wheel drive, LOW range?
#1858347 - 06/19/04 05:28 PM
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My driveway is steep, I run 4 low when the trailer is loaded to save the transmission. You have double the torque so spinning tires and such is not a good idea, however I would be surprised if the transfer case would be the first item to fail.
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Stringer
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Re: 2 Wheel drive, LOW range?
#1858438 - 06/19/04 07:46 PM
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Ok, lets do some math on this one. Your motor is stock, so let's figure it makes about 375 lb of torque. Now I believe your low range is 2.72:1. With an assumed 5.75:1 reverse ratio, that equates to 5865 lb of torque coming out of your x-case. Alot, but not really. Imagine what is coming out of a modified PSD or Cummins for flywheel torque, and then do some math! A u-joint would explode before the case would let go. I have yet to hear of a case cracking/breaking with this procedure.
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juggernaut300
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Re: 2 Wheel drive, LOW range?
#1858576 - 06/19/04 10:16 PM
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All your are doing when in 2x4 low is engaging the planetaries (which are "inline" with the tranny and drive shaft) to give you the extra gearing. The only thing you should worry about is if the hubs ARE engaged on the pavement. Otherwise you can drive all day long in 2 lo and not hurt a thing as long as you dont go above 15 - 20 mph.
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burlbon
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Re: 2 Wheel drive, LOW range?
#1858983 - 06/20/04 09:29 AM
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I wouldn't worry too much about it. I have been doing that for years with all of my trucks and have never hurt anything. If definately makes backing easier, less strain on the clutch and much easier to back when you slow things down.
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RodVT
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Member # 41913
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Reged: 04/14/04
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Loc: Vermont
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Re: 2 Wheel drive, LOW range?
#1859690 - 06/20/04 08:48 PM
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Thanks everyone. I feel much more comfortable now and will use it whenever I need to go slow.
Jim, thanks, I got the DMF conversion email, it's great. I love the internet!
Rod
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