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Unread 08-11-2008, 07:06 PM   #1
jjeeeeppss
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Front driveshaft too long after swapping front differential

1998 Grand Cherokee with 249 Transfer Case.

Okay; I've swapped out the front differential and control arms (both were bent).

The one I put in has a bigger differential case so it's longer, making my driveshaft too long.

Here's the question:
Is it okay to drive it without a front driveshaft until I get mine shortened?

Thanks.

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Unread 08-11-2008, 07:13 PM   #2
the88thpianoman
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Driving without it can cause problems, and will probably take a lot of life out of your VC
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Unread 08-11-2008, 08:26 PM   #3
jjeeeeppss
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That's what I've heard, but I've also heard that the 249 transfer case on the 1998 is different and won't damage the VC if you drive without the front drive shaft.
I think I'll play it safe though.
Thanks.
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Unread 08-11-2008, 09:44 PM   #4
ajmorell
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What did you swap your front end out for?
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Unread 08-11-2008, 09:59 PM   #5
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what front end did you put in thats larger than the D30?
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Unread 08-12-2008, 05:21 AM   #6
ratmonkey
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post a picture of your front axle, mainly the back half of it.
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Unread 08-12-2008, 08:38 AM   #7
anticrombie
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First thing, you'll be fine if you remove the front shaft and drive it. 96+ you can do this.

Second, I'm curious as well as to what diff you put in there that's bigger? The only thing I can think of is the hp30.
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Unread 08-12-2008, 09:08 AM   #8
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96+ can be run without a front driveshaft with minimal if any issues. A driveline shop will be able to shorten your driveshaft and rebalance for a nominal fee.

I seem to remember that the OP had a failure in his stock D30, so got a D30 from another Jeep. For some reason (anomaly?), the differential case was a bit longer. As I remember, it was a low pinion 30.
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Unread 08-12-2008, 09:44 AM   #9
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need to know wich axle it is.....

where in calli are you? i might be able to give you a hand.
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Unread 08-12-2008, 02:13 PM   #10
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Diff. year D30 would be long pinion v's short pinion which he had. dammed if I can remember which years had what though.
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Unread 08-12-2008, 02:46 PM   #11
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Okay. I swapped it out because the original got damaged (axle housing on left side bent back and control arms on that side bent pretty bad).
I looked at many junkyards, but couldn't find the shorter one like i had. It sounds like it is the long/short pinion thing.
The only Shorter one (like mine) I could find was damaged, so I figured I'd try the longer one and also get the driveshaft out of the vehicle it came out of.
For some reason, the driveshaft that it came with is even longer than my original (unless the guy at the junkyard got it mixed up with another one). Maybe the junkyard jeep had a different engine and/or transmission which made the transfer case further back.
Both mine and he junkyard one had the type 249 Transfer case. But, the one at the junkard is a '96 while mine is a '98.

I'm in San Jose, CA and figure I'll check Southbay Driveline to see about having the driveshaft shortened.

I do plan to change the yoke out so I can use the original U-joint driveshaft instead of the CV joint one it came with. That'll be a hastle because of the pinion bearing pre-load, but I'll try measuring the rotational torque and set it back to the same value ( I don't think I can use the nut position as a guide for getting it back to where it is since it'll be a different yoke). It's possible that the original driveshaft will fit (have enough play in the slider), but I'm not counting on it.

Thanks for all the inputs.
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Unread 08-12-2008, 05:19 PM   #12
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1996 1/2 and newer ZJ's have the TJ style (shorter) pinion. Older than 1996 1/2 have the longer pinion.
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