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Old 09-17-2013, 09:45 AM   #16
Bullet Ride
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If the driveshaft was rubbing so hard that the car is stopping as if you were applying the brakes you'd be able to hear it/feel it. I think that there's something else causing the problem, the rubbing driveshaft is just a side effect of that problem.

For instance... why is the drive shaft even rubbing in the first place? My driveshaft isn't that close to rubbing anything. Do you have some of those subframe bushings that raise the subframe up higher? If so, those bushings require diff spacers I believe, to lower the diff.
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Old 09-17-2013, 09:46 AM   #17
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I unbolted the driveshaft from the diff and there was so much pressure on it that it wouldn't pull back at all.


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Old 09-17-2013, 09:49 AM   #18
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The subframe was replaced last year due to the top of the diff mount being broken from rust. Stock subframe bushings were pressed in. The car does look like it had a rear end collision or something previously though.


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Old 09-17-2013, 09:55 AM   #19
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I unbolted the driveshaft from the diff and there was so much pressure on it that it wouldn't pull back at all.


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With the threaded collar by the CSB undone?
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Old 09-17-2013, 10:20 AM   #20
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Loosened off yes. What is the point of that btw?


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Old 09-17-2013, 11:05 AM   #21
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Loosened off yes. What is the point of that btw?


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Old 09-17-2013, 11:11 AM   #22
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I think they have that to lock the back half in position once it's bolted to the diff because the drive shaft is balanced as a unit. If you were to accidentally pull it apart you'd have a fun time getting the balance right again.
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Old 09-17-2013, 11:15 AM   #23
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Hmm maybe. Mines not balanced anyways because the front half shaft is custom. You should come by after I'm done school and check this peice of shit out lol. It's driving me insane.


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Old 09-17-2013, 11:25 AM   #24
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Hmm maybe. You should come by tonight and take a look at it. I basically wanna throw it out lol. There's no way it has anything to do with the diff I don't think. The only reason it's stopping the whole car is because the diff is locked. See last year the LSD worked. And you could spin the wheels freely on both sides. But now both wheels spin the same way no matter what, like the LSD portion locked up.


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Old 09-17-2013, 11:43 AM   #25
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Hmm maybe. You should come by tonight and take a look at it. I basically wanna throw it out lol. There's no way it has anything to do with the diff I don't think. The only reason it's stopping the whole car is because the diff is locked. See last year the LSD worked. And you could spin the wheels freely on both sides. But now both wheels spin the same way no matter what, like the LSD portion locked up.


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I can't come by unfortunately because I'm going out of town for a few days and need to pack my shit up tonight. Maybe when I get back.

I thought you said you welded the diff? Welded diff = no more limited slip lol

If your driveshaft was out of balance you'd feel it for sure, but again, it wouldn't cause the issue you are describing.
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Old 09-17-2013, 12:03 PM   #26
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I took that diff out and out in a 3.78 lol. I wouldn't wreck a 4.1.


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Old 09-17-2013, 01:00 PM   #27
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So it sounds like your driveshaft won't pull away from the diff because the rear section of the driveshaft is bottoming out on the slip yoke. If the driveshaft is somehow in compression from the trans and diff then your motor must have moved or something moved to create this situation. How did you get the length of the driveshaft when you did the swap? How much of the slip yoke did you have exposed to get to the proper length?

LSD/welded diff: wheels spin same direction.
Open diff: wheels spin opposite direction.

If you modified the driveshaft it has to be rebalanced. The drive shaft should be balanced in two sections to avoid the separation problem that Bullet Ride has described above.

From what you just described it sounds like possibly your diff/trans input/output bearings are seeing axial loads from the driveshaft which they are not designed for.
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Old 09-17-2013, 01:06 PM   #28
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Also that threaded collar pressures a piece of rubber between the male/female portions of the slip yoke so that the presence of any backlash is not an issue.
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Old 09-17-2013, 03:13 PM   #29
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Ya sounds like your driveshaft is too long
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Old 09-17-2013, 03:25 PM   #30
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There's no contact or stress. The drive shaft is spaced enough. And the shaft doesn't have to be ballanced. There was no way for me to balance mine. I'd know if it was out of balance from it wobbling or bouncing. I've had the car to 180 without any any vibrations or issues.


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