vibration in the rear (drive shaft problume?) - Nissan 240SX Forums
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#1 Old 05-02-2006, 10:26 PM
 
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vibration in the rear (drive shaft problume?)

I just recently finished my rb25det swap into a s14 using stock r33 crossmember and costum tranny braket. it pulls nice but vibrates violently at over 40mph. I know its not the wheels cause i balanced them my self. the angle for the drive looks perfict and the drive shaft is new. do you think the length of it is the problume. mine is 42.5 in. from ujoint to ujoint. thet gives it .5 in. of play. I do have a semi solid bushing for the tranny mount too. is that causing the vibration to travel to the car. any thing will help. Thanks
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#2 Old 05-02-2006, 10:30 PM
 
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could be a driveshaft problem but it sounds like a wheel problem (are your wheels bent)?






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#3 Old 05-02-2006, 11:22 PM
 
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make sure shaft is securely locked down to the diff
i had this same issue
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#4 Old 05-02-2006, 11:54 PM
 
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I dubbled check the rear fange
And the wheels Rolled fine on the balancer
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#5 Old 05-03-2006, 11:26 PM
 
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hmm what vibrates exactly? the whole car? the steering wheel? like be a little more specific.
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#6 Old 05-04-2006, 12:47 PM
 
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I put my car up on the lift last night and took of the rear wheels and drove it in 5th to 40mph When it was still up on the lift. and the thing was still vibrating (the whole car)I went under to listen with a sethascope and to feel where the vibrations are coming from. most if not all were coming from the rear end and my axles. I come to conclude that I broke somthing in my rear end or my axles are warped. They did look alittle lopsided. The vibration did not happen until my 2nd drive around the block when I wot through all first 3 gears.(when I first finished the swap)
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#7 Old 05-04-2006, 01:47 PM
 
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Hmm sounds interesting. It could be the wheel bearings are gone in the rear. When they go the rear end gets really loose. I doubt you warped the drivesharfts unless they were in bad shape already. Are you sure your driveshaft was balanced? if it wasn't then it will cause the same problem...

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#8 Old 05-05-2006, 04:27 AM
 
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I belive the shaft is balanced. there is a wiegth welded on it. Ann the place i took my shaves in is a reliable place. The wheel bearings are still good, no play in them or noise coming from them. I probubly broke some teeth in the dif or broke the bearings in the dif. it's still just a stock non lsd dif.
Thanks for all the help. If any one could think of any thing else I'll be more then happy to look in to it.
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#9 Old 05-05-2006, 08:54 AM
 
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Quote:
Originally Posted by XIONM7716
I belive the shaft is balanced. there is a wiegth welded on it. Ann the place i took my shaves in is a reliable place. The wheel bearings are still good, no play in them or noise coming from them. I probubly broke some teeth in the dif or broke the bearings in the dif. it's still just a stock non lsd dif.
Thanks for all the help. If any one could think of any thing else I'll be more then happy to look in to it.
i doubt you broke the ring gear, there have been plenty of cars running round on the factory rear end making 500+hp and not killing the diff, if anything you'll break the axels before you destroy a nissan rear end.
have you tried checking the tightness of the driveshaft bolts, even if they are slightly loose the vibrations will be insane.

Shift_BOOM. Damnit.

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#10 Old 05-06-2006, 01:03 AM
 
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Is the trans straight? I had a little problem with mine when I installed it. It was striaght so I would get this strange sound from the rear of the car. I didn't look from the top when I was adjusting the mount.
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#11 Old 05-06-2006, 04:41 AM
 
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ladies like vibration in the rear

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