1964 Chevelle vibration between 50-70 MPH - Chevelle Tech
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Transmission & Driveline Transmissions and Differentials

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  #1  
Old Sep 29th, 07, 11:07 PM
neal64ss neal64ss is offline
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Default 1964 Chevelle vibration between 50-70 MPH

I just got my 1964 chevelle back on the road. Recently put in a 700r4. The driveshaft has been balanced and new yoke/u-joint at the tranny end. I get a bad vibration between 50 and 70 mph, above about 73 mph it is smooth as silk. Same vibration accelerating and decelerating. I tried rotating the tires from front to back with no improvement.

What should I do next?
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  #2  
Old Sep 29th, 07, 11:59 PM
Dave427 Dave427 is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

It sounds like a driveshaft vibration, is it like a drown noise?

Dave
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  #3  
Old Sep 30th, 07, 4:44 AM
neal64ss neal64ss is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Driveshaft balanced, new yoke and u-joint on the tranny. All set up by the driveshaft shop in my area.

It is more of a vibration than a noise.
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  #4  
Old Sep 30th, 07, 7:23 AM
elcamino66 elcamino66 is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Shorter drive shaft might have thrown the driveline angle off. Do a search on pinion angle.
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  #5  
Old Sep 30th, 07, 4:29 PM
McQ McQ is offline
 
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Default Re: 1964 Chevelle vibration between 50-70 MPH

I did a similar swap on my el camino. Double check the rear u joint, and rear pinion. This became more evident after I swapped. When vibrating at say 55, does shifing to a lower gear remove the vibration or change it.. Bent drive shaft? Flex plate or T/converter balance. I have had a flex plate break from wobble (dibris behind mounting points). It vibrated. Will it vibrate if you just rev it to 2500-3000rpm in neutral? Take it to the balance shop and have them look.
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  #6  
Old Sep 30th, 07, 8:47 PM
neal64ss neal64ss is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Vibration is dependent on mph, not rpm. Makes me think the vibration is coming from behind the transmission.

I checked the pinion angle and it appears OK to me. I dont remember what I measured but did research it when putting the tranny in. I guess it wouldn't hurt to double check it again.
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  #7  
Old Sep 30th, 07, 8:51 PM
neal64ss neal64ss is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

What should I check on the rear pinion? The rear u-joint was part of the assembly that was balanced at the driveshaft shop, I would think it is OK.

Could a "loose" front suspension cause vibration between 50-70 mph? My front suspension is getting close to needing an overhaul.
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  #8  
Old Oct 1st, 07, 9:05 PM
fridgeguy fridgeguy is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Can you duplicate this on jack stands. If the vibration is still there then that eliminates the front end. Next remove the wheels, bolt the drums or discs to the hub to eliminate the tires. If you can plug the trans out put, remove the drive shaft to elimitate it. Chances are it is the pinion angle but all this will eliminate components.
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  #9  
Old Oct 1st, 07, 9:23 PM
McQ McQ is offline
 
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Default Re: 1964 Chevelle vibration between 50-70 MPH

I found my pinion bearings were worn. This and a slightly worn u joint caused vibration. I noticed it right away after the swap, because I had been driving a new car for a while during the swap.. I have had out of balance drums, bent wheels, poorly machined axles; all cause vibration. I was able to eliminated the problems.. It takes a methodical approach. Did this car vibrate before the drive line change? If not, it *must* be the components you changed. You can raise the rear axle and support with Jack stands. Run the speed up to 60. THIS IS DANGEROUS. But it will tell you a lot. If the vibration is gone, it was your front wheels etc. I suspect it is not. But, if it still vibrates, you can let it idle in gear and check for bent rims etc. ARE the wheels balanced? Thrown weights?? Driveline is higher frequency than wheel or tire vibration. My 78 elcamino had 1 bent rim, and I ended up buying 2 salvage yard axles, and one brand new axle to eliminate wheel wobble. Old cars...........be careful and good luck.
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  #10  
Old Oct 2nd, 07, 3:17 PM
neal64ss neal64ss is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Vibration was there before swap, but now it is much worse. Before swap it was between about 60-70 mph, now it is about 55-70 mph.
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  #11  
Old Oct 2nd, 07, 3:29 PM
68KMENO 68KMENO is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

bent axle , bad tire , out of balance drive shaft, out of balance tire , bad shocks , loose lug nuts, but I'd check for a bad U-joint , its possible you don't have one seated correctly in the yoke !! BTDT
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  #12  
Old Oct 2nd, 07, 6:18 PM
00WS6TA 00WS6TA is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

I had the same problem and had my drive shaft straighten and that it, no vibration. Maybe get you drive shaft checked out again by someone else.
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  #13  
Old Oct 9th, 07, 6:14 PM
neal64ss neal64ss is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Well, I put the rear on blocks and ran it up to 50 mph. Stopped at this point as the vibration was much worse and started sooner (about 40 mph instead of 50 mph) than when I was driving it.

Now I am confident that the front end is not the culprit.

Rotated the tires and same vibration, I don't think the wheels/tires are the culprit.

I had the driveshaft trued and balanced with a new front yoke (the old one was twisted), I don't think that is the culprit.

That leaves only the rear end, right? Anyone have any other ideas? Where is a good place to look for upgrading the rear end. The original posi unit has bad axles and ring gear, the open unit currently in the car was a junkyard donor out of a cutlass if memory serves right. Also the car seems like it has "slack" in the driveline, was evident both before and after the swap from 4-speed to 700r4.

Should I rebuild or start fresh. Both axles are 10 bolt. Will any year rearend fit 64 or is it a different width than other years?
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  #14  
Old Oct 10th, 07, 12:32 PM
neal64ss neal64ss is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Anyone?
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  #15  
Old Oct 10th, 07, 3:01 PM
fridgeguy fridgeguy is offline
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Default Re: 1964 Chevelle vibration between 50-70 MPH

Depends on your budget. You can overhaul it and still wind up with a somewhat weak 10 bolt. Buy new and you have lots of choices. Personally, when my diffy packs it in I'm buying a Ford 9". Currie has a good website where you can build the rear end and it cost's it out for you. Another good source is Moser.
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