I'm getting the shaft.... - Alfa Romeo Bulletin Board & Forums
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post #1 of 21 (permalink) Old 10-01-2017, 08:15 PM Thread Starter
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I'm getting the shaft....

1964 Sprint GT everything that moves in the suspension replaced and/or upgraded poly etc, harmonic vibration in drive train isolated to drive shaft, do I repair and re balance or go for this (i keep all the old parts)

https://www.alfaholics.com/parts/105...shaft-section/

Any feedback will be appreciated..

Last edited by Tom Frasca; 10-01-2017 at 09:49 PM.
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post #2 of 21 (permalink) Old 10-02-2017, 06:05 AM
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Thats pretty simple actually.
This one is different in outlook from your 64 shaft. So, are you a purist or anorak or do you just want it te work as designed ?
You could have yours rebalanced and the UJs replaced. Try that first. If you are happy. Fine. If not replace by this one.
Beware, you hasve the old style, thin shaft with two UJs both with grease nipples , and the 8mm bolts. Later style has no grease nipples and 9 mm bolts.
Check out with Jim at AH before ordering.
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post #3 of 21 (permalink) Old 10-02-2017, 03:54 PM Thread Starter
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Quote:
Originally Posted by Berlinista View Post
Thats pretty simple actually.
This one is different in outlook from your 64 shaft. So, are you a purist or anorak or do you just want it te work as designed ?
You could have yours rebalanced and the UJs replaced. Try that first. If you are happy. Fine. If not replace by this one.
Beware, you hasve the old style, thin shaft with two UJs both with grease nipples , and the 8mm bolts. Later style has no grease nipples and 9 mm bolts.
Check out with Jim at AH before ordering.
JIM IS A GOOD MAN...$ 80 USD parts, labor $165 ( WITH RE BALANCE) and there is still a problem ??? As I mentioned I will keep all parts as we are custodians of these wonderful early cars ... that said am leaning toward the new AH drive shaft...but still would like to know others experience... Thanks
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post #4 of 21 (permalink) Old 10-02-2017, 05:31 PM
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Agreed, Jim is a very, good man.

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post #5 of 21 (permalink) Old 10-02-2017, 06:04 PM
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if you remove the old shaft you can examine the sliding section, if it is worn you'll need to replace, otherwise new u-joints and a balance along with new center support would be the way to go. Hope you don't have poly-bush in the trans mount, they cause vibration

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post #6 of 21 (permalink) Old 10-03-2017, 12:24 AM
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Was the harmonic vibration there before any poly bushes were installed?

If not I'd blame them.
Pete

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post #7 of 21 (permalink) Old 10-03-2017, 02:07 PM Thread Starter
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Quote:
Originally Posted by PSk View Post
Was the harmonic vibration there before any poly bushes were installed?

If not I'd blame them.
Pete
I am unfamiliar with a poly bushing ... the one part of the car that was left alone was the driveshaft, as the "doughnut" and carrier seemed to be in very good shape... I did grease all the u-joint fittings...
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post #8 of 21 (permalink) Old 10-04-2017, 12:40 AM
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Quote:
Originally Posted by Tom Frasca View Post
I am unfamiliar with a poly bushing ... the one part of the car that was left alone was the driveshaft, as the "doughnut" and carrier seemed to be in very good shape... I did grease all the u-joint fittings...
If you have a driveline vibration and replace any of the rear suspension bushes with poly instead of the originally specified rubber the vibration is transferred to the body shell and you feel it. Rubber is far superior at isolating vibrations.

Also the same happens if you replace the gearbox mount with poly or stiffer rubber.

So if you are unable to find the source of your driveline vibration and have installed poly (rear) suspension/mount bushes, replace them with rubber first to see if the vibration reduces/goes away.
Pete

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post #9 of 21 (permalink) Old 10-04-2017, 07:14 AM Thread Starter
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Quote:
Originally Posted by PSk View Post
If you have a driveline vibration and replace any of the rear suspension bushes with poly instead of the originally specified rubber the vibration is transferred to the body shell and you feel it. Rubber is far superior at isolating vibrations.

Also the same happens if you replace the gearbox mount with poly or stiffer rubber.

So if you are unable to find the source of your driveline vibration and have installed poly (rear) suspension/mount bushes, replace them with rubber first to see if the vibration reduces/goes away.
Pete
Thanks Pete....The trailing arms are all rubber did replace thrust washers with poly the center drive shaft support is rubber...
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post #10 of 21 (permalink) Old 10-04-2017, 07:54 AM
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Tom, for what it is worth, I had a very similar issue with my '67 Super. I had the drive shaft balanced several times locally and still had the vibration. Finally took it to an old friend across the state that rebuilds drive shafts on commercial trucks. He called me shortly after I left and said "**** thing is bent, you can't balance a bent shaft" He then straightened it, balanced it, and it was perfect after that.
Good luck, Mike
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post #11 of 21 (permalink) Old 10-04-2017, 03:24 PM
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Quote:
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Tom, for what it is worth, I had a very similar issue with my '67 Super. I had the drive shaft balanced several times locally and still had the vibration. Finally took it to an old friend across the state that rebuilds drive shafts on commercial trucks. He called me shortly after I left and said "**** thing is bent, you can't balance a bent shaft" He then straightened it, balanced it, and it was perfect after that.
Good luck, Mike
Wish I could find someone around Nebraska to do that. Only two truck places in the state that do it and they don't have the proper hardware to match either end of the two piece shaft.
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post #12 of 21 (permalink) Old 10-04-2017, 07:24 PM Thread Starter
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Quote:
Originally Posted by sprintgtc View Post
Tom, for what it is worth, I had a very similar issue with my '67 Super. I had the drive shaft balanced several times locally and still had the vibration. Finally took it to an old friend across the state that rebuilds drive shafts on commercial trucks. He called me shortly after I left and said "**** thing is bent, you can't balance a bent shaft" He then straightened it, balanced it, and it was perfect after that.
Good luck, Mike
Was your chassis hit how did the drive shaft "bend"... some darn heavy gauge metal ....???
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post #13 of 21 (permalink) Old 10-05-2017, 07:42 AM
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Originally Posted by Tom Frasca View Post
Was your chassis hit how did the drive shaft "bend"... some darn heavy gauge metal ....???
No, I bought the car disassembled. The car was apart for several years and I believe the drive shaft was dropped at some point.

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post #14 of 21 (permalink) Old 10-26-2017, 04:18 PM Thread Starter
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Quote:
Originally Posted by sprintgtc View Post
No, I bought the car disassembled. The car was apart for several years and I believe the drive shaft was dropped at some point.
Mike I ment to respond ...bent DS never occurred to me so that will be the first thing we check before repairs, Thanks

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post #15 of 21 (permalink) Old 10-26-2017, 06:43 PM
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