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Old 11-11-2005, 11:22 PM   #1
bigrig
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Default driveshaft knock on lowered biscayne

last week i replaced the center support for the driveshaft because it had completely ripped off it's base(i found this out only after i pulled the driveshaft off the car) it was making a really HARD knock at low speed when i was slowing down just before i was stopped or when i would leave from i complete stop, worked fine for about a week but i hear the noise coming back not as loud or as hard but it is coming back. the car is lowered alot, do you think that i changed the driveline angle so much that it keeps ripping that center support off?
should i try a shorter driveshaft?
anyone with a x frame chevy had this problem?
it's a 64 biscayne with a 230 inline 6
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Old 11-11-2005, 11:49 PM   #2
bigrig
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Default Re: driveshaft knock on lowered biscayne

here's a pic
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Old 11-11-2005, 11:49 PM   #3
DrJ
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Default Re: driveshaft knock on lowered biscayne

Pontiac put a slip joint in the second/rear shaft so the movement of the rear end wouldn't push the bearing out of the rubber bushing. Chevy was too cheap and just hoped it would stay together till it was out of warranty (3 months).
Most driveline updates for those '58-'64 X frame Chevys include cutting and turning one of the front yokes 90 so they are in phase and adding a slip joint to the rear shaft.
(I got this done on my '60 with new U joints for under $300.
I don't have it done and on the road yet though, so I can't tell you how it works.)
Also, when lowering the car sometimes the center support needs to be shimmed up, or the trans tailshaft eeds to be shimmed up or the pinion angle needs to change to keep it all in phase.
There is a "black magic" service manual formula for all the included angles on cars that are stock height, but they start out with "make sure car is stock height" and if the car is always carrying a heavy load (lowered) it's an adjust and road test till the vibration goes away black magic trick.
The pinion angle is adjusted by shimming that single upper control arm at the frame. If the rear bushings are shot, start by replacing them because the rear end is twisting all over the place if they are worn and letting the rear end move.

If they had CV joints instead of U joints, none of this would be a problem....
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Old 11-11-2005, 11:51 PM   #4
bigrig
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Default Re: driveshaft knock on lowered biscayne

another look
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Old 11-12-2005, 06:15 AM   #5
KING CHASSIS
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Default Re: driveshaft knock on lowered biscayne

By lowering the car you have shortened the distance between the carrier brgn. and the rear end. When you are jacking up the car and putting it on jack stands, put them under the rear axle. This way the springs are loaded like it is sitting on the ground. Take the shaft out and measure under the car from the center of the rear carrier brgn. mount hole and the center of the u-joint on the rear end. And compare the difference with your driveshaft on the ground. I think that you will find that the rear shaft needs shortened a little. Also some one sells a carrier brg for those cars with poly "cushion" in stead of the rubber that is easily torn out. I worked in a driveshaft shop for 13 years and i have fixed this problem a "few" times. As to who makes the poly one that has slipped my mind i have been out of that business for about 4 years. But you could probably check in JEGS or with PST (they have them full page ads usualy on the back cover of car mags and they sell poly suspension stuff). Hope this helps
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Old 11-12-2005, 06:18 AM   #6
KING CHASSIS
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Default Re: driveshaft knock on lowered biscayne

By the way bitchin ride.
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Old 11-12-2005, 06:34 AM   #7
epinut
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Default Re: driveshaft knock on lowered biscayne

Your Biscayne looks really clean. I'll squint my eye's & imagine a set of astros or chrome reversed with bias plys...
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Old 11-12-2005, 11:29 AM   #8
bigrig
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Default Re: driveshaft knock on lowered biscayne

thanks for all the help, i found what i need (i think).
here's a link if anyone else has this problem.
www.dicksdriveshaft.com/partsdeptlowriders.htm
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Old 11-12-2005, 11:54 AM   #9
Randy D
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Default Re: driveshaft knock on lowered biscayne

in addition to the mentioned solutions above, you might check to be sure you didn't spit out a snap ring allowing the U joint to move side to side with the cup out of place. Not likely the problem, but it was on a 60 impala i worked on earlier this summer. Nice car, BTW.
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Old 11-12-2005, 11:56 AM   #10
mazdaslam
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Default Re: driveshaft knock on lowered biscayne

Nice car! You could also slot the bolt holes in the frame for the bearing mount.Slot them towards the front of the car.Then you can slide the whole shaft assembly foreward to make up for the rear being lowered.I did this on my old 64 Impala after ripping up a few bearings.I never had another problem after that.
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Old 11-12-2005, 04:56 PM   #11
b29chevy
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Default Re: driveshaft knock on lowered biscayne

I screwed that up, didn't finish the thought, I'll try again; Rise-'er up 'til the driveshaft don't knock, it'll look better with a little rake anyhow.
Quote:
Originally Posted by b29chevy
Rise-'er up 'til the driveshaft don't knock.
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Old 11-12-2005, 10:37 PM   #12
bigrig
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Default Re: driveshaft knock on lowered biscayne

it's got a pretty good rake right now
i'll post my results after the install-hopefully this will solve all the driveline problems i've been having,nothing like having a car you love driving and hating it for all the misery it brings you at the same time........
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Old 11-13-2005, 12:54 AM   #13
Brandy
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Default Re: driveshaft knock on lowered biscayne

Lowering your X frame Late Great even slightly will throw the entire shiteroo out of whack. My 58 Biscuit is only lowered 3 inches and it ticks that bearing off something TERRIBLE.

Easy fix for that is to take it to a driveline shop and have a slip yoke installed. That will allow the shaft to travel without eating the bearing. Something else that will allow you to maintain your bearing a lil longer is to install it properly, ie. have the car up off the ground all the way round and level. Also if you like, fill the holes in the bearing rubber with black urethane. It gives the rubber a little more substance. In the meantime if you feel like spending the money, buy a poly bearing from Inland Empire Driveline. They also sell a one piece driveshaft if you are feeling creative and cut the X center out and install new members.
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Old 11-13-2005, 01:01 AM   #14
Kev Nemo
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Default Re: driveshaft knock on lowered biscayne

Yeah-me, too, except I have a lowered '62 Imp. Found out about the drive shaft at the Day of The Drags when the Christmas tree guy went 'Goddamn, something is bouncing pretty fierce in the rear of your car!'. No more runs after that
I'm getting it fixed soon-maybe I'll get some pix????

Oh yeah-sweet car, by the way
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Old 11-13-2005, 09:56 PM   #15
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Default Re: driveshaft knock on lowered biscayne

Keep the updates coming. I've got the same problem. Will probably go with the poly driveline/ driveshaft. Unless they want a fourtune for it.


We'll see.
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Old 11-13-2005, 11:56 PM   #16
bigrig
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Default Re: driveshaft knock on lowered biscayne

will do, should get it around wednesday or thursday.
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