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Unread 09-28-2013, 01:36 AM   #1
Knightrider9827
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4x4 open difs?

So.... engaged 4wd FT in my laredo selectrac, drove around the parking lot, when I went to turn into my spot ( sharp left ) I got halfway in and the jeep slowed to a stop. Repeated this twice. Same results..... put it back in 2wd and went around the parking lot, when I pulled in my spot there was no resistance like normal? ........is this normal? Thought open difs wouldn't do this....then again I am completely new to the 4x4 scene. Maybe PO changed difs????

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Unread 09-28-2013, 03:58 AM   #2
jodart73
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Full time locks the transfer case, part time leaves it open. It'll still do the same in part time, but not as bad.
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Unread 09-28-2013, 06:13 AM   #3
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Originally Posted by jodart73 View Post
Full time locks the transfer case, part time leaves it open. It'll still do the same in part time, but not as bad.
Common mistake, but this is backwards. Fulltime is open and part time is locked. In fulltime, it should not bind at all in turns. If it does, you may not have gotten all the way into fulltime. Try changing the transfer case fluid, and you may need to adjust the shifter linkage.
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Unread 09-28-2013, 08:19 AM   #4
Knightrider9827
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Wow, either I'm an idiot or I was drunk when I posted that!! ( im gonna go with drunk) Not a clue why I thought it would be the difs.....ill check the linkage and swap the fluid out on sunday.... how do I know if the linkage is off??
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Unread 09-28-2013, 10:57 AM   #5
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Sounds to me like it was working as it's supposed to. Full time means you can leave it in that mode all of the time and it acts like AWD (sort of). Part time means it's in 4Hi all of the time and you can only use it on a part time basis (i.e. on non-tractive surfaces). I think you making a tight turn in FT, the t-case detected different wheel spin and engaged 4Hi. If you were in the snow or mud, I would say that is fine, but I wouldn't do that too often on a sticky parking lot. Best way to test it out is on a gravel road or other slippery surface.
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Unread 09-28-2013, 04:26 PM   #6
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Originally Posted by Planetcat View Post
Sounds to me like it was working as it's supposed to. Full time means you can leave it in that mode all of the time and it acts like AWD (sort of). Part time means it's in 4Hi all of the time and you can only use it on a part time basis (i.e. on non-tractive surfaces). I think you making a tight turn in FT, the t-case detected different wheel spin and engaged 4Hi. If you were in the snow or mud, I would say that is fine, but I wouldn't do that too often on a sticky parking lot. Best way to test it out is on a gravel road or other slippery surface.
He has selectrac. No wheel speed detection taking place.
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Unread 09-28-2013, 06:37 PM   #7
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He has selectrac. No wheel speed detection taking place.
I have selectrac on my XJ and it behaves like my all-time setting on my WJ nv247 when the XJ is in full-time mode. Basically, the transfer case detects wheel slip between front/rear wheels and then engages. Am I off base? The OP said he was in full time 4wd.
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Unread 09-28-2013, 06:45 PM   #8
Knightrider9827
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Yep 4FT, only thing I can think of is that I make a few left turns or right turns, depending on the route i take through my apartment complex, right before I turn the same direction into my parking spot. Maybe the difference in wheel spin is causing it?
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Unread 09-28-2013, 07:03 PM   #9
Planetcat
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Originally Posted by Knightrider9827 View Post
Yep 4FT, only thing I can think of is that I make a few left turns or right turns, depending on the route i take through my apartment complex, right before I turn the same direction into my parking spot. Maybe the difference in wheel spin is causing it?
Maybe try it in 4 part-time and see if it behaves the same. To me, that would imply that it's engaging in FT due to differences in wheel spin.
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Unread 09-28-2013, 07:34 PM   #10
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Quote:
Originally Posted by Planetcat View Post
I have selectrac on my XJ and it behaves like my all-time setting on my WJ nv247 when the XJ is in full-time mode. Basically, the transfer case detects wheel slip between front/rear wheels and then engages. Am I off base? The OP said he was in full time 4wd.
Yup, that's not how the 242 works. It's 48% front, 52% rear then sends power down the path of least resistance from there. It does not have any kind of coupler that could detect wheel spin.
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Unread 09-28-2013, 09:09 PM   #11
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Yup, that's not how the 242 works. It's 48% front, 52% rear then sends power down the path of least resistance from there. It does not have any kind of coupler that could detect wheel spin.
Interesting. That's good to know. No wonder you never hear of anyone rebuilding their NV242 or replacing the progressive coupler. I just assumed that it behaved the same way as the nv247. Thanks for the clarification.
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Unread 09-28-2013, 10:16 PM   #12
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I drove around town with it in 4ft today and it didn't bind at all this time, even when I parked. Weird.. last night it bound enough to bring the jeep to a standstill. Gonna have to test it a few more times . With the rain around here lately I don't think I'm gonna be able to do anything with the fluids until next weekend.....hopefully.
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