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Unread 05-29-2005, 01:48 PM   #1
Rcher
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Join Date: Sep 2004
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NP249 to Np242

np249 to np242 swap

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I just finished most of the job of swapping my transfer cases. The very last two things I have to do is reinstall the rear drive shaft and adjust the linkage. So far it has been troublefree but just before I took a break for lunch, I tried to install the rear driveshaft and it looks like a tight fit.

How much free play do I need? Does the driveshaft need to be shorten? By how much?

Also is a driveshft from a 4.0 shorter than my 5.2 driveshaft?


BTW did the Search.

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Unread 05-29-2005, 02:47 PM   #2
O Holy P
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I did a 247 to 242 swap...and the driveshaft was a real tight fit. I need to get it shortened prolly about 1/2 to 3/4". Haven't done it yet and no problems so far. Just not going to get too agressive off road yet till it's done. Plus I still need tires. As far as the linkage goes...on my '99 WJ there are two holes on the bracket mounted to the trans mission where the shift linkage cable can be installed. I moved mine to the opposite hole and it worked. I've put about 2k miles on it since the swap and I'm running Dextron III in the TC. Fun in the rain or loose gravel....can you say fish-tail?


pg
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Unread 05-29-2005, 05:38 PM   #3
Rcher
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Yikes! It is a tight fit. You're a braver man than I am.

I got my driveshaft on there but I only had less than 1/8" of free play. Took it off. I finished the job and then set down to figure out how to make the dash board lights work.

Anybody know how to make the dash shift indicator lights work?
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Unread 05-29-2005, 08:48 PM   #4
O Holy P
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Part #56041438-aa to get the part-time light to work on the dash, it's about $20, you an try getting it from dodge or just get the plug/harness thing from a junkyard - I've heard it's not easy to find. If you want to get a different shifter...for the WJ it's about $120 for the whole thing. Haven't done that yet either, don't really see a need too till I just have money to blow.

It may be different for a ZJ. But atleast you can start somewhere.


pg
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[b]For Sale:[/b]
'99 Limited WJ - Deep Slate Pearl Coat
RB1 update, Rusty's 2.5", 255/70r16 Goodyear MTR's, Pro Comp MX6, Rancho RS5000 Stabilizer, 242 Swap, Gibson Exhaust !cat.

'95 z28 six speed - black w/ red stripes
solid roller 396ci LT1
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Unread 05-29-2005, 10:19 PM   #5
Rcher
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Thanks!

Next question, I need the rubber dust boot that goes over the driveshaft splines. Anybody got a part number for that boot?
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Unread 05-29-2005, 11:18 PM   #6
O Holy P
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Haha, nope....I got my driveshaft from a junkyard and it came with everything...even u-joint straps and bolts!!! Couldn't believe it for $75.


pg
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[b]For Sale:[/b]
'99 Limited WJ - Deep Slate Pearl Coat
RB1 update, Rusty's 2.5", 255/70r16 Goodyear MTR's, Pro Comp MX6, Rancho RS5000 Stabilizer, 242 Swap, Gibson Exhaust !cat.

'95 z28 six speed - black w/ red stripes
solid roller 396ci LT1
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Unread 05-30-2005, 04:21 PM   #7
Rcher
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Finished the job, whoo hoo!!!


Here are my observations and tips:

1. If you don't have a lift and your driveshaft is more or less straight from the tranfer case to the diff, then it may be okay for your driveshaft to fit fairly tight. I had a BB and wasn't comfortable with the amount of play I had so I ground off 3/8" from the transfer output shaft and 3/8" from the yoke slip spline. I'm happy with the movement I have now. Tried it out off road and looks good so far.

2. Couldn't find a dust boot anywhere online. So I zip tied a bicycle inner tube on. Looks good so far.

3. Couldn't get my shift indicator lights to work right. Eventually found out that the shift switch was busted and swapped the switch from the 249 and it works fine.

For future reference, behind the VIC on '98 ZJ, you unplug the red plugs and plug together the black plugs.

Then all of your indicator lights will work except the "LO" light. OK, one light out of 10 ain't bad and I can live with it. But the wheel lights work and all the rest works just when you shift into 4LO, all you get is "PARTTIME".
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Unread 05-31-2005, 11:47 AM   #8
Dr. Righteous
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Quote:
Originally Posted by O Holy P
I did a 247 to 242 swap...and the driveshaft was a real tight fit. I need to get it shortened prolly about 1/2 to 3/4". Haven't done it yet and no problems so far. Just not going to get too agressive off road yet till it's done. Plus I still need tires. As far as the linkage goes...on my '99 WJ there are two holes on the bracket mounted to the trans mission where the shift linkage cable can be installed. I moved mine to the opposite hole and it worked. I've put about 2k miles on it since the swap and I'm running Dextron III in the TC. Fun in the rain or loose gravel....can you say fish-tail?


pg

Hey, glad you finally got that NP242 installed! It seemed to be in great accept for the hole in the case .
I gave my '95 ZJ to my wife and bought a '94 4.0L ZJ with a NP242 factory. BUT, I have a NP242 that I was going to install in the '95 but never got around to it. IF the CV in the NP249 ever goes out I will swap it then. But believe me. My wife needs AWD.
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