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Old 08-28-2012, 11:12 PM   #1
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8.8 drive shaft?

Hey guys i recently got my 8.8 in and under and going good, flexing like a MF'er too, completely happy with it, though now, driving down the road i noticed a vibration that wasnt there with my d35, I was wondering if any one would reccomend replacing the drive shaft with a nice one or replace the stock one? Im pretty sure its the drive shaft, it does have a dent in it which didnt really effect its performance before

Im trying to see if any one has had this problem after the swap, and what would possibly cause the crazy vibration, also im now getting a grinding kind of noize from the tranny it sounds like if I dont keep a load on the throttle. which might be a differnt issue though...

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Old 08-28-2012, 11:21 PM   #2
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If it didn't cause vibrations before, why would it be causing it now?

Do you have the ujoints in right?
Are the ujoints worn?
Did you grease them?
Everything tight?
Anything wrong with the axle when you got it?
Wheels on straight/tight?
Pinion angle set right?

Disconnect the driveshaft and drive in 4wd, are the vibrations gone?

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Old 08-28-2012, 11:32 PM   #3
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hmmm true true, my pinion angle is set right, as far as i know thought, i set it at 17 with a 4" lift, i had trouble when getting the ujoint in so i have it a few wacks with a hammer, i might have wacked it too much? did grease them, axle came off of a car that had minor front end damage, like a 25mph collusion... looked good and true... as far as everything being tight, ill double check the splicer.. and probably take off the drive shaft this weekend. sounds like a project =)
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Old 08-29-2012, 08:46 AM   #4
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Quote:
Originally Posted by MarkNog View Post
If it didn't cause vibrations before, why would it be causing it now?
Because the differential on an 8.8 is offset to the passenger side; it's not exactly in the middle like a D35 or D44. Because of this, it's almost impossible to not get vibrations without a CV drive shaft. Even those who have an otherwise stock height Jeep have needed to get an SYE/CV shaft and all that entails. If he has any amount of lift, this applies even more.

OP, you might end up needing a CV shaft; most anyone who has done an 8.8 conversion has had to get one, so I would expect to need one eventually. You'll thank yourself later for getting one. If you truly need that 8.8 for the offroading you do, you're going to want a CV shaft.

That being said, before spending money on an a CV shaft and all that entails, try this: I assume you used a flange adapter to bolt your shaft up to the flange on the 8.8, correct? Try having your shaft rebalanced with the flange adapter. After having a very small vibration even with my CV shaft and then talking to a local drive shaft shop, apparently it is very common to have vibes with the adapters.

And before any of that, triple check your pinion angle. If you have the stock shaft, it shouldn't be in-line like a CV shaft would. Get an angle finder, and set it properly:

http://www.4xshaft.com/driveline101.html
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