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Unread 02-26-2010, 12:32 PM   #1
JuddRacing
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Full-time vs. Part-time 4X4

Stupid question, but on my dash it has a Part-time and a Full-time light. In 4hi it has only ever said Part-time. I checked the manual and I can't find anything listed as to what the difference is.

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Unread 02-26-2010, 12:33 PM   #2
alex211
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That light will only work if you have an NP242 transfer case, I think.
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Unread 02-26-2010, 12:35 PM   #3
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"Part" time means it's on for off road use, where "full" time means it's for "all the time" meaning on road use as well. It's weird, I know.. but "part" time is referring to not using it all the time (off road) where as full time is referring to using it all the time (on road)..

My Grand Cherokee had full time and part time. I don't think Wranglers do. Correct me if I'm wrong.
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Unread 02-26-2010, 12:36 PM   #4
NotURMailman
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The cluster is a generic one made by Jeep for multiple models. Some t-cases have a full time 4wd position. The difference being that full time 4wd will have a differential in the t-case between the front and rear outputs; and a part time does not, meaning that both outputs always turn at the same speed.
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Unread 02-26-2010, 12:40 PM   #5
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Originally Posted by JuddRacing View Post
Stupid question, but on my dash it has a Part-time and a Full-time light. In 4hi it has only ever said Part-time. I checked the manual and I can't find anything listed as to what the difference is.
How did you find this out? How many positions of TC shifter do you have?
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Unread 02-26-2010, 02:07 PM   #6
JuddRacing
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I can see the "Full-time" indicator on the panel even though I've never seen it lit. My TC shifter just says 2H, 4H, N, 4L.
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Unread 02-26-2010, 02:11 PM   #7
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Originally Posted by NotURMailman View Post
The cluster is a generic one made by Jeep for multiple models. Some t-cases have a full time 4wd position. The difference being that full time 4wd will have a differential in the t-case between the front and rear outputs; and a part time does not, meaning that both outputs always turn at the same speed.
Yep, my '97 cherokee seems to use the same dash and it has the np242 with full time.
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Unread 02-26-2010, 02:11 PM   #8
Jerry Bransford
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The Wrangler's 4x4 system is strictly a part-time 4x4 system, there is no full-time 4x4 system available on a TJ. Your dash was originally also used in the Cherokee that had a full-time 4x4 system optionally available. The Full-Time indicator will never light in a Wrangler.
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Unread 02-26-2010, 02:58 PM   #9
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Judd dont feel bad, I had the same question but was afraid to ask. LOL
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Unread 02-26-2010, 03:07 PM   #10
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Originally Posted by JuddRacing View Post
I can see the "Full-time" indicator on the panel even though I've never seen it lit. My TC shifter just says 2H, 4H, N, 4L.
thats normal. mines the same way. same dash was used in the XJ. XJ's were available with the both NP242 t-case or the NP231. TJ's only got the NP231. The difference being the NP242 has an extra shift point for Full-Time 4x4, which was basically a 48%/52% bias "open" diff style 4wd, allowing the front and rear driveshafts to travel at different speeds. The Part-Time 4x4 NP231 only allows the front and rear shafts to travel at exactly the same speed. Remember how when you go around a corner all 4 wheels travel at different speeds due to the arc of the circle? Well...Part-Time forces both driveshafts to spin at the same speed....so if you use Part-Time on high traction surfaces....kaboom, something blows up. Front wheels must be allowed to slip to account for this difference.
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Unread 02-27-2010, 04:25 AM   #11
Vodkaman
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Quote:
Originally Posted by JuddRacing View Post
I can see the "Full-time" indicator on the panel even though I've never seen it lit. My TC shifter just says 2H, 4H, N, 4L.
Lucky you are! You can swap to 242 TC, and have a proper indication.
I will try to pick up a sunny day and look at my dash board too. Maybe I have same luck.
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Unread 02-27-2010, 08:31 AM   #12
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Originally Posted by Jerry Bransford View Post
The Full-Time indicator will never light in a Wrangler.
Never say never.



Once I get the 242 in there, I'll have to figure out how to get that lamp to light up when I shift it into fulltime. The above picture was taken during a gauge test where you hold the trip meter reset button while turning the ignition to "on."

Edit: It would be nice to have the "4 LO" lamp light up also when appropriate. Hmmm...
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Unread 02-28-2010, 06:20 PM   #13
WVTJ
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I'm new and I got it used, so when I shift to

4H = Part Time light
4L = Part Time light

Is there no 4LO light????
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Unread 02-28-2010, 06:22 PM   #14
Jerry Bransford
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Originally Posted by WVTJ View Post
Is there no 4LO light????
You are correct, there is no 4Lo light since it's hard to not know when you're in 4Lo.
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Unread 02-28-2010, 06:31 PM   #15
WVTJ
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My Jeep was totaled when I got it I knew 4Lo worked, just figured the bulb was burned out.
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