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post #1 of 11 (permalink) Old 07-05-2008, 01:24 PM Thread Starter
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rear end rumble and vibration

I recently took delivery of a 1976 Spider purchased on Ebay from California and transported to Kentucky. On first drive, I discovered a rumble noise from the rear of the car and vibration that can be easily felt. It occurs when pulling from a stopped position and when accelerating thru first and second gear, mainly. It is mostly while under pressure. It becomes less noticable once you are up to speed and does not exist at all when coasting. I gave a limited check of the u-joints, carrier bearing and guibo thing. Holding one end of the drive shaft and turning the other presents no excessive play, and the rubber appears to be solid. Turning the drive shaft, it seems to move about 1/8th of a turn before taking up the slack in the rear end. Same with turning one rear wheel...about 1/8th of a turn play in rear end. I just changed the rear end oil, which did seem to make rearend a tad bit quieter, but did not affect the rumble and vibration. While on the stands and running, I put car in gear and let out clutch. No noise or vibration. The trunnion arm bushings appear to have chips out of the area between the ridge on the arm and the mounting bracket to the body. I suspect this to be the cause of the rumble and vibration. Finally, here's the question. 1) can the trunnion arm be removed and bushing replaced without taking out the rear end. 2) Would it be just as easy to remove the rear end and replace ALL bushings...I think I know the answer to that one. 3) does any of this sound like there could also be a differential issue. The car is a no rust, complete, un-molested, original car with only minor paint issues which will require minimal body work and a paint job. I plan to have the car for some time and making improvements/repairs as needed and plan to keep it pretty much original. For you Lexington,KY guys....I'm still looking for answer to who would be a good mechanic in the area to do those jobs beyond my experience level. Looking forward to a drive that doesn't sound like the rear end is coming out from under the car. This is a great forum. I spent the past several years looking at the Triumph Register forum that seemed like a ghost town. It's nice to see people being active. Thanks for your input.
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post #2 of 11 (permalink) Old 07-05-2008, 02:12 PM
 
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Have you safety checked the car before driving it ? Have you confirmed the
wheel torque first?
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post #3 of 11 (permalink) Old 07-05-2008, 02:37 PM Thread Starter
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lights work- wheels are on- brakes work, now if I can just get the rear end figured out.
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post #4 of 11 (permalink) Old 07-05-2008, 03:48 PM
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I had a similiar problem.

Here is my thread on it.

http://www.alfabb.com/bb/forums/spid...r-shudder.html

In the end, I changed the tranny mount and poof! No more rear shudder.

Good luck.

1991 Spider Veloce - Red on Tan - Rosa Bionda
1987 Spider Quadrifoglio - Red on Grey - Rosa - Sold
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post #5 of 11 (permalink) Old 07-06-2008, 11:54 PM
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I've got the same problem with my car - did all the tests that you have done with the same results. Changing the rear wheel bearings has helped a bit but on my car (1973 Super) but I suspect the rear diff - it has done about 400 000kms... I have had the halfshaft out & there is a bit of wear on the gear end. Also, check the pinion nut (you need to take the propshaft off for that - mine was loose. It needs to be tight. I can't remember the correct torque offhand but it was a lot! If the diff is the problem, it might be worthwhile finding a good second hand rear axle & fitting straight to the car. I have one which I have stripped to check/replace the bearings & fit to my car but getting hold of new bearings is really difficult - found a few hen's teeth but no bearings yet...!
Good Luck!
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post #6 of 11 (permalink) Old 07-07-2008, 08:34 AM
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Be sure you check the U joints and center support bearing before you jump into assuming it is in the rear end. You are sitting very close to all of this stuff and it can all sound suspiciously lika rear end problems when in fact it is a driveshaft problem of some sort.
Robert
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post #7 of 11 (permalink) Old 07-07-2008, 08:51 AM
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yup good advice. I did all that too. The centre support is new. A new secondhand hand propshaft & u-joints helped a bit but the main problem still exists. BTW occasionally there can be play in the propshaft. This also causes a vibration. Make sure that the cap on the larger diameter tube is tight (where the smaller tube slides in & out). This might help for a while... I'ts worth looking at the simple stuff first.
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post #8 of 11 (permalink) Old 07-07-2008, 09:08 AM
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Hey Joe:

Sounds like you are on the right track. Centerline sells a kit for the driveshaft at a discounted price. This kit along with a rear tranny mount should cure your issue:

Centerline Products: DS115 Driveshaft Rebuild Kit: Spider, GTV, and Berlina 1969-74, Spider 1969-94

and

Centerline Products: TM723 Transmission Mount 1750, 2000 All

In regards to Lexington mechanics, I know that there is one that Dale trusts. I bet Bud knows who it is as well. I don't have a name on them. Its NOT Stuggart. Someone over around Eastland at a euro shop. I usually turn my own wrenches. When I had my Spider over for work in LEX prior to the convention, I visiting my friend Jimmy at Saron Dr. Midas just to put rotors and pads on. He will happily jump in for more, but he doesn't know the torque specs and doesn't have any special tools. We usually get together locally for tech sessions. We actually did this repair on another locals car last year at one of the tech sessions. I'll see if I cannot get a name out of Bud or Dale for recommendation.

Best Regards,
John M

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1978 AR Spider Veloce 2000....the first and still here...Bianco
1984 AR Spider Veloce............the second & gone to the parts bin....Rosso
1992 AR Spider Veloce............the third and still here...Bianco
1991 AR 164L........................the fourth and traded on the SS....Rosso
1965 AR Sprint Speciale..........the fifth...in boxes....sold....Bianco
1978 AR Spider Veloce 2000....the sixth gone to be a parts car...slow black
1967 AR Giulia Sprint GT.........the seventh with Gregg and sold......Rosso
1993 AR Spider Veloce............the eighth with Gregg and still here....Verde Inglese
1982 Ferrari 308 GTSi.............the first and still here....Azzurro
1999 Ferrari 355F1 Spider........the second and still here....TdF Blue[/SIZE]
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post #9 of 11 (permalink) Old 07-08-2008, 08:39 AM
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Joe,

The one John mentioned that Dale Strassner trusts is Mike Reynolds: Mikes Import & Domestic Auto Repair Inc. 859-273-8481. I don't have any experience, but Dale has had work done by this guy. My understanding is that he is a one man shop. A larger shop is Perfect Auto Repair, 859-254-1973. This is owned by Steve DeMartino, a real car nut and a person who will discuss problems. He has a Crosley Hotshot with a Chevvy V8, and has also built a Bonneville Lakester. The only thing I had done there was to charge the A/C on my '91 Spider, but Steve seemed like someone who might want to dig into a difficult problem.

Howver, neither of these people are specifically Alfa specialists.

If you're in town on July 19, come out to the Keeneland Concours d'Elegance we have car club paddocks right next to the show field, and some Alfisti from Lexington, Louisville and Cincinnati should be there. You don't have to be a member of anything; just tell the admissions people you want to park with the Alfas.

Keeneland Concours d'Elegance

Quote:
Originally Posted by John M View Post
...In regards to Lexington mechanics, I know that there is one that Dale trusts. I bet Bud knows who it is as well. I don't have a name on them. Its NOT Stuggart. Someone over around Eastland at a euro shop. I usually turn my own wrenches. When I had my Spider over for work in LEX prior to the convention, I visiting my friend Jimmy at Saron Dr. Midas just to put rotors and pads on. He will happily jump in for more, but he doesn't know the torque specs and doesn't have any special tools. We usually get together locally for tech sessions. We actually did this repair on another locals car last year at one of the tech sessions. I'll see if I cannot get a name out of Bud or Dale for recommendation.

Best Regards,
John M


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George Schweikle

1976 Spider (Dedicated Autocrosser, "SPICA, No Carbs")
1991 Spider Veloce (Retirement cruiser)
Scuderia Non Originale
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post #10 of 11 (permalink) Old 07-08-2008, 09:27 AM
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There is a small rubber tube like affair which fits on the back of the trans output shaft and the first section of the driveshaft fits over this tube. Lack of this rubber bit can cause some vibration problems, as well damage the tip of the trans output shaft. There was a post on this a while back. I will see if I can find it. Lack of this rubber bushing might also contribute to your problem.
Robert

Found it.

Over 20 pages back. It is post on 05-15-08, Main Shaft and Drive Shaft Bushing. By AR3040022.
You need to read this post and all the replies if you are not familiar with this bushing or don't know if your car as one or not.

Last edited by vf31rhill; 07-08-2008 at 03:16 PM.
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post #11 of 11 (permalink) Old 09-14-2008, 06:49 AM Thread Starter
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prioblem solved

Replaced transmission mount, overhauled driveshaft and changed differential grease. Not sure which part fixed it but it's done and I have moved on to the next issue. Thanks for all the feed back, expecially the thread on making the tool to push out the trans mount I found in searching. It was great!!! Turned out to be a 2 bandaid job. Not bad.
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