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4x4 Shift on the Fly?

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Old 11-07-2012, 03:39 PM
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Originally Posted by XJ-92
The NP231 you are supposed to stop or very low speed and go into neutral then switch to 4wd. the NP 242 it has the full time so it wont actually put it in 4wd unless there is slipping in the traction.
Did you read the factory instructions I posted?

I was Service Manager and Shop Foreman at a 5 star Jeep dealer for 13 years.

Your assesment of the 242's operation is totally wrong as is your advice on shifting the 231.
Old 11-07-2012, 03:40 PM
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Originally Posted by TN12valve
Personally, i ALWAYS stop and put the transmission in neutral before doing any kind of Tcase shifting.

Seen a NP231 blow a case in half shifting from 2hi to 4hi at about 35mph.

Thats just me though

Speed was not the cause. It was designed to be shifted from 2H to 4H and back again at "any legal speed".

I've done it at 80MPH more than once.
Old 11-07-2012, 04:45 PM
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Originally Posted by cruiser54
Speed was not the cause. It was designed to be shifted from 2H to 4H and back again at "any legal speed".

I've done it at 80MPH more than once.
hey since you worked at jeep can you tell me why when I shift out of 4H to 2H the part time light stays on for a while and then begins to flicker and sometimes I have to pull the lever into 4H-2H a few quick times to get the light to go off even then the part time light flickers then goes off.
Old 11-07-2012, 05:11 PM
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Originally Posted by Slim357
hey since you worked at jeep can you tell me why when I shift out of 4H to 2H the part time light stays on for a while and then begins to flicker and sometimes I have to pull the lever into 4H-2H a few quick times to get the light to go off even then the part time light flickers then goes off.
Commonly the cause of this is sloppy linkage, like from worn bushings or it just needs to be adjusted and greased. The switch on the transfer case reads the position of the shift fork inside the unit, so it accurately reflects the position that the transfer case is in. A lack of lubrication could also cause this but you'd notice quite a bit of noise.
Old 11-07-2012, 05:21 PM
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Originally Posted by salad
Commonly the cause of this is sloppy linkage, like from worn bushings or it just needs to be adjusted and greased. The switch on the transfer case reads the position of the shift fork inside the unit, so it accurately reflects the position that the transfer case is in. A lack of lubrication could also cause this but you'd notice quite a bit of noise.
This^^ and tapping the gas and letting off many times helps.
Old 11-07-2012, 06:21 PM
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Originally Posted by cruiser54
Did you read the factory instructions I posted?

I was Service Manager and Shop Foreman at a 5 star Jeep dealer for 13 years.

Your assesment of the 242's operation is totally wrong as is your advice on shifting the 231.
54,

Like I saw in a movie once...

"Kill Bubba, Kill."
Old 11-07-2012, 06:58 PM
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Originally Posted by CCKen
54,

Like I saw in a movie once...

"Kill Bubba, Kill."
Is that a compliment? LOL.
Old 11-07-2012, 07:57 PM
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Originally Posted by cruiser54
Speed was not the cause. It was designed to be shifted from 2H to 4H and back again at "any legal speed".

I've done it at 80MPH more than once.
shifted in 4wd @ 80!!!!...---HOLY ****E!!!!!


I was driving home from work last winter and couldn't remeber what my owners manual said to do. I keep the manual in my house.


So i slowed down to 45mph and put it in N then shifted to 4hi then back to drive. But 80mph???? I wouldn't want to attempt it...
Old 11-07-2012, 08:50 PM
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Originally Posted by OEJ
shifted in 4wd @ 80!!!!...---HOLY ****E!!!!!


I was driving home from work last winter and couldn't remeber what my owners manual said to do. I keep the manual in my house.


So i slowed down to 45mph and put it in N then shifted to 4hi then back to drive. But 80mph???? I wouldn't want to attempt it...
I had 13 Comanches as demos and drove numerous new vehicles at the dealership. We liked to do durability testing!!

Any legal speed. I think the speed limit in Nevada at that time was "prima facia", whatever was deemed safe. We were in Arizona so that was close enough for us. I initially did it with a factory service rep in the Jeep with me, on a dare.
Old 11-07-2012, 09:03 PM
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Originally Posted by OEJ
shifted in 4wd @ 80!!!!...---HOLY ****E!!!!!

I was driving home from work last winter and couldn't remeber what my owners manual said to do. I keep the manual in my house.

So i slowed down to 45mph and put it in N then shifted to 4hi then back to drive. But 80mph???? I wouldn't want to attempt it...
If you can man-handle the shifter into 4H successfully at those speeds it is said that Chuck Norris himself comes down from the heavens with a flipped Dana 300...
Old 11-07-2012, 09:05 PM
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Originally Posted by salad
If you can man-handle the shifter into 4H successfully at those speeds it is said that Chuck Norris himself comes down from the heavens with a flipped Dana 300...
Slides in like butter at any speed. Don't need no stinkin' help from Chuck Norris.
Old 11-08-2012, 07:40 AM
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Originally Posted by cruiser54
Is that a compliment? LOL.
Yes.
Old 11-08-2012, 02:33 PM
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Originally Posted by cruiser54
This^^ and tapping the gas and letting off many times helps.
ok well I do this but doesnt help and jw any chance it could be the disco on the axle because from what I understood the Renix era Cherokees it was the disco shift fork that made the part time light come on and off
Old 11-08-2012, 02:54 PM
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Originally Posted by Slim357
ok well I do this but doesnt help and jw any chance it could be the disco on the axle because from what I understood the Renix era Cherokees it was the disco shift fork that made the part time light come on and off
It's the VACUUM to the shift fork that turned the light on via a vacuum switch located on teh passenger side firewall. Blue deally with a wire on it and a vac line and dump valve.
Old 11-08-2012, 03:14 PM
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My 89 Renix doesn't have vac disconnect axle. That makes me happy.


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