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Old 01-03-2008, 04:54 AM   #1
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Np 231

I was getting driveline vibration from my new 01 jeep, it has a four inch procomp short arm, the person that owned it before me had a inch tranny pan drop on it. I thought that the driveline vibration was because of the lift so I got a rubicon express cv drive shaft and the 1807 slip yoke eliminator kit "the hack and tap". While i was down there hacking i noticed that there was movemnt in the driveshaft. It definetly looks like the outputshaft is bent. How hard is it to crack open and replace? Can I leave the transfercase on the vehicle? Any sugestions? The local Driveline shop wants to charge a grand to fix.

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Old 01-03-2008, 12:44 PM   #2
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Well, for a grand you can get a new t-case.

But its really not that hard. And would be best removing the t-case to replace the output shaft. If you can afford it, sell the hack-n-tap kit and buy yourself a real SYE kit that comes with a new tail housing and shaft.

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Old 01-03-2008, 03:18 PM   #3
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Yes it can definitely be done in the jeep, but for your first time I would suggest pulling it. Cracking the 231 is very easy and can be done with generic hand tools and a good set of snap ring pliers.

However like Az stated if you were able to get rid of your Hack and Tap and pick up a more common SYE setup it would completely replace your output shaft and tail housing to a shorter beefier version. Would only cost you around 250 and a few hours worth of work.
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Old 01-03-2008, 03:54 PM   #4
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...and a good set of snap ring pliers.
It's not so much that they need to be good quality, it's that they need to be able to be opened significantly wider than typical snap ring pliers can be. It took me a while to find a set that opened widely enough which happened to be on a MATCO tool truck I happened upon while passing a new car dealership. The snap rings used on the t-case need to be opened really widely to get them off the output shaft which is also a big diameter. That's why normal snap-ring pliers won't work for this particular job.
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Old 01-03-2008, 05:49 PM   #5
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It's not so much that they need to be good quality, it's that they need to be able to be opened significantly wider than typical snap ring pliers can be. It took me a while to find a set that opened widely enough which happened to be on a MATCO tool truck I happened upon while passing a new car dealership. The snap rings used on the t-case need to be opened really widely to get them off the output shaft which is also a big diameter. That's why normal snap-ring pliers won't work for this particular job.
I am not a patient man anyways, but doing the snap rings on 231's really try my patience. Until I got a good strong big set of snap ring pliers as you've described. Can't remember where I found them, but it was as random as the Matco truck you described Jerry.
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Old 01-03-2008, 05:56 PM   #6
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Well i guess I'm going to have to keep driving by the dealerships untill I find a set.
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Old 01-03-2008, 08:59 PM   #7
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I got a HD pair at NAPA
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Old 01-04-2008, 01:34 PM   #8
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Thanks guys, the hack and tap seemed like a stronger option than the regular slip yoke in the scense that it has nuts and bolts holding it on to the flang instead of a u joint. I doubt that you could break either very easy. I will probably end up having to get the other slip yoke kit cause I am having a hard time finding the rear output shaft.
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Old 01-04-2008, 02:16 PM   #9
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Old 01-04-2008, 03:57 PM   #10
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Thanks guys, the hack and tap seemed like a stronger option than the regular slip yoke in the scense that it has nuts and bolts holding it on to the flang instead of a u joint. I doubt that you could break either very easy. I will probably end up having to get the other slip yoke kit cause I am having a hard time finding the rear output shaft.
Yeah it does seem that way however if you think about it, it really isn't. Any SYE other than the Hack and Tap provides you a new shorter, thicker, and stronger output shaft that will hold up better in the long run than just cutting the original output shaft. Of course that's not to say that Hack and Tap's can't and won't last. I have a couple friends that used them 5 or more years ago and much hard wheelin later they are still intact.

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