Question about 4WD when in 2WD
- Thread starter Emoto
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rockymountain
Full Access Member
What actually happens in the transfer case is the question. Everything keeps turning from the transfer case on.
ptsb5a
Full Access Member
Everything under the front still spins. All you've done by sticking the t-case in 2wd is removed the application of torque to the front drivetrain.
Atrus
Full Access Member
EVERYTHING still spins.
The only difference is that the front drivetrain spinning from the road isn't connected to the rear drivetrain spinning from the engine/trans.
This is an oversimplification, but think of it as the drive chain in the transfer case is removed. Everything is still spinning, the front and rear gears just aren't connected anymore.
The only difference is that the front drivetrain spinning from the road isn't connected to the rear drivetrain spinning from the engine/trans.
This is an oversimplification, but think of it as the drive chain in the transfer case is removed. Everything is still spinning, the front and rear gears just aren't connected anymore.
thank you!! now then.....the rear axle is doing all the work while in 2wd....correct???cryinghard.gifcryinghard.gif
Robsama
Full Access Member
I have a question similar so I'm just gonna go ahead and hijack this thread. When driving in slippery conditions, it is bad to shift in and out of 4WD? When I drive home from work some roads are really bad but some are pretty well plowed and fairly flat and straight. I like to shift into 2WD as often as possible to save gas and for less wear and tear overall. Is that bad?
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No. Not bad.
Atrus
Full Access Member
Not bad, and with a command trac transfer case, I'd consider it necessary.
Unless you have Selec-Trac, you don't want to be in 4WD in any conditions that don't permit wheel slippage, otherwise you'll get driveline binding.
Unless you have Selec-Trac, you don't want to be in 4WD in any conditions that don't permit wheel slippage, otherwise you'll get driveline binding.
rockymountain
Full Access Member
the exact opposite is bad.
Robsama, do you have an auto ******? Don't you have 4full time then?
And shifting in and out of 4part time doesn't hurt any, it was designed to be able to do that..'shift on the fly'..
Some Auto's are Command Trac....most are I think...
Marlon_JB2
Kombat Edition Jeep
Robsama, do you have an auto ******? Don't you have 4full time then?
And shifting in and out of 4part time doesn't hurt any, it was designed to be able to do that..'shift on the fly'..
That only applies for export models.
But anywho, that's why Jeep made it "Shift On The Fly". You should have no issues shifting in and out constantly.
And yeah most automatics are Command-Trac. Take any year KJ Sport for example, you're more likely to find a CRD (which includes Selec-Trac over here) than a 3.7L Auto with Selec-Trac. Limiteds are an entirely different story and most of those are Command-Trac too!
Robsama
Full Access Member
Robsama, do you have an auto ******? Don't you have 4full time then?
And shifting in and out of 4part time doesn't hurt any, it was designed to be able to do that..'shift on the fly'..
'05 Renny with auto trans. Nope, no full time. Just 2HI, 4PART and 4LOW. And N obviously.
kj924
Administrator
'04 Limited with Selec-Trac here.
Atrus
Full Access Member
'07 Sport with Selec-Trac. Not extremely common, but it does happen.
I've seen non CRD Sports with Selec Trac...
05 Limited with Selec Trac here.
05 Limited with Selec Trac here.
tjkj2002
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The select trac was a option on all KJ's besides the ones with manual transmissions,does not matter if it is a Sport,Limited,or Renny,standard in all the US CRDs(all auto trans).
Midgear
New Member
02' sport automatic command trac
LibertyFever
Full Access Member
I always get confused when you call it by the tradename. I like to think of them by their purpose.
Part-time = NV-231 = the Command Trac
Full-time = NV-242 = Selec-Trac
Wikipedia Jeep four wheel drive systems page
It still surprises me that the transfercase used in the majority of Jeeps is the NV-231/NP-231. The design hasn't changed much over the years but there are variations.
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