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Old 10-30-2006, 11:17 AM   #11
VAPILOTDA
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For what it's worth, my first 5.9 blew out the driveshaft and I drove it around for a month or so without the driveshaft in it. I even took in on 200 plus trips in 2wd. When I put the new driveshaft back in it, it didn't complain a bit. I didn't know there could be an issue with not having it in but there was not a blatant problem with it when I put it back in. Maybe I just got lucky.
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Old 10-30-2006, 12:23 PM   #12
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From what has been said, there are differences in the T-cases. I didn't know this, so the newer ones (96 and up) may not have this problem. Someone chime in if you have had this problem with a newer t-case.

Here is why it will roll in park. We need to think of the VC as a differential. If you jack up the rear end of a rear wheel drive car, and it is in PARK, you can still get the tires to rotate. If you rotate the tire on one side, the other will rotate in the opposite direction...even though it is in park. The transmission is locked, the drive line is locked, but the rotation from one tire can be transferred through the differential to the opposite tire. If you take out an axle shaft and cut it in half and reinstall it, you can park on a hill and the car will roll backwards. The cut shaft section that is inside of the differential will spin freely while both tires are rolling backwards.

In the Jeep, think of the VC as a differential. If you cut one side of the axle (take out the drive shaft) and leave the other one connected, the car will still roll in park. The transmission is locked in park. But the rear drive shaft can rotate and allow the car to move because the VC (acting like a differential that applies different speeds and power to the different wheels) doesn't have anything else on the other side of it to stop it from spinning. So nothing in the transmission moves because it is in park. But the front and rear output shafts (which are connected through the VC) can still spin. Again, the VC is acting like a differential and can spin even when everything else in front of it in the transmission is locked down from moving.

Putting a transmission in park doesn't lock your tires, it locks the entire system that sends power to your tires. If parts are missing from the system that will allow independent movement between tires, problems can occur.

I am not an expert on the internal workings of the t-case. I don't know if this is only a problem in the older 93-95 t-cases. But this does happen. I am not sure if running without a front ds will damage the VC. I have seen two different GC's roll with the front drive shaft out while they were in park.
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Old 10-30-2006, 04:48 PM   #13
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ive found real world experience is worth twice as much as book knowledge. i guess its kind of hard to dispute someone who has disproved the masses. sounds like i stank corrected, but it makes you think, its bad for a vc to have the wrong size tire on but ok to just run the back. who'd have thought!
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Old 12-02-2006, 09:27 AM   #14
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I have had my front driveshaft out in my 98 for 3 years I drop the driveshaft in b4 the 1st snowfall & remove it in march & I think it has extended the life of the vc (now have 151k) but am swaping the case out to a 39k case I found from a 5.9
a co worker has a 94 & I heard him pulling in a spot & the tires were chirping & told him he may pop a u jount or his diff & he pulled the shaft & the truck has rolled 2 times in the last mo ( he now uses his e brake)
but at least he can turn
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Old 01-02-2007, 08:06 PM   #15
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I just swapped my 98 249 into my sister's 95 and here's what I found, the early 249 mainshaft has a planetary like a 242 so the front and rear are never really connected. The late 249 has a solid mainshaft from the front planetary all the way to the rear d-shaft and when shifted into low range the VC is no longer part of the equation. I will be pulling the 98 case again this weekend to install a new VC and post pictures of the two side by side. Looking at the internal's it doesn't seem like you should be able to damage the VC in a newer case with the front shaft pulled.
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Old 02-03-2007, 03:07 AM   #16
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i ran my old grand w/o the front shaft for MONTHS, wicked cool burnouts, and not a problem EVER. just not real torque like it did in awd. lol 4low both shafts u can hop the front end a ways up there if u try hard enuf.
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Old 03-14-2007, 03:02 PM   #17
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yup
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Old 03-14-2007, 07:25 PM   #18
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alright so I want to know for sure. My vc is basically done for and am going to buy a new one to put in the 249, but I won't have the funds for awhile. If I take the front driveshaft out will I hurt anything? I don't care about hurting the vc because it's done for anyways, but will anything go wrong with my tcase? I have a 97 zj laredo. thanks.
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Old 03-15-2007, 08:26 AM   #19
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I believe the 96 up is locked front to rear, so it may not matter. It seems that those who haven't had any problems when removing the driveline had the newer 249... the newer locking 249 t-case. The 95 and older 249 doesn't lock fron to rear. If you remove the front driveline from one, you will roll. This is what I have gathered from the comments that have been made about the internal workings. But I don't have experience with t-cases like others on this site.

Either way, I would use your e-brake. I drove for a while with my VC going bad. Even made two 600 mile round trips. It felt like crap right after getting off of the interstate, but was ok after it cooled down. How bad is it? If it really isn't that bad, just leave the driveline in till you get a new case or a new VC.
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Old 03-15-2007, 06:33 PM   #20
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I just want to add to this, that i decided to try out removing the front driveshaft on my '93 GC. Well the only thing that i can say definitely is that the acceleration seemed to be off. As if it were trying to compensate for the front driveshaft being removed, it was MORE sluggish on acceleration and didn't seem to want to GO. Reinstalled the driveshaft and it went away.

Also, my GC rolled down a hill while in park and i luckily noticed it happening before it hit anything.
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