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Username Post: manual transmission question        (Topic#362848)
apix17 
Contributor
Posts: 156

Loc: San Francisco Area
Reg: 12-22-07
10-08-20 08:02 PM - Post#2805135    

I have my 55 Belair 3 speed manual transmission with overdrive removed for clutch work. I have been chasing a vibration for quite some time that happens about 55 mph and above. Because of what I have ruled out I suspect the vibration may be coming from the transmission. I have no transmission experience. I am asking for advice from those who may be familiar with this tranny as to what i can check in the tranny that may be causing the vibration while it is out. Your input appreciated. Thanks



 


55MAS 
Senior Member
Posts: 1557

Loc: North Coast, USA
Reg: 12-19-01
10-09-20 04:00 AM - Post#2805141    
    In response to apix17

  • apix17 Said:
I have my 55 Belair 3 speed manual transmission with overdrive removed for clutch work. I have been chasing a vibration for quite some time that happens about 55 mph and above. Because of what I have ruled out I suspect the vibration may be coming from the transmission. I have no transmission experience. I am asking for advice from those who may be familiar with this tranny as to what i can check in the tranny that may be causing the vibration while it is out. Your input appreciated. Thanks



Before the transmission. Have you verified that the pilot bushing in the crank is not worn oversize at the bore? Have you verified that the universal joints have no play?




 
acardon 
Ultra Senior Member
Posts: 11469

Loc: DFW TEXAS
Reg: 03-25-05
10-09-20 06:02 AM - Post#2805149    
    In response to apix17

Does the vibration go away when you let off the gas or push in the clutch? It's not very likely that the transmission will cause a vibration.

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
apix17 
Contributor
Posts: 156

Loc: San Francisco Area
Reg: 12-22-07
10-09-20 10:28 AM - Post#2805159    
    In response to acardon

A little about my vibration. I installed new u joints and have had the driveshaft balanced. I installed new motor mounts. Vibrates in or out of overdrive while accelerating or coasting or maintaining speed Clutch in or out makes no difference. Have tried shutting engine off at about 65 mph no difference. Transmission in second or third makes no difference. Put new balanced tires on no change. Also checked run out of tires.Also checked for correct angles between engine driveshaft and rear end. Front end in good shape no play. I have owned the car about four years has done it since I got it.I have not checked pilot bearing but will. Thanks for your comments any other comments appreciated.



Edited by apix17 on 10-09-20 11:45 AM. Reason for edit: No reason given.

 
acardon 
Ultra Senior Member
Posts: 11469

Loc: DFW TEXAS
Reg: 03-25-05
10-09-20 12:45 PM - Post#2805163    
    In response to apix17

Is the differential open or posi traction? With the rear end jacked up, can you feel any roughness when manually rotating the tires? Any noise from rear end?

Don
66 Corvair (driving)
57 2dr HT (driving)
56 2dr HT (waiting to be restored)


 
Lead sled 
Frequent Contributor
Posts: 2062
Lead sled
Age: 61
Loc: Walton,NY.
Reg: 11-04-09
10-09-20 02:16 PM - Post#2805171    
    In response to apix17

Could just be that the Ujoints are out of phase

Late yr model (Dec. 51 BelAir/ 52 trim), with a basically stock 67 Camaro SS350/295hp Turbo Fire Edelbrock 1405, Saginaw 4spd/355 geared 55/6 Chevy rear.2,1st place,and 1 top five award trophies so far
http://www.picturetrail.com/bris51deluxe


 
apix17 
Contributor
Posts: 156

Loc: San Francisco Area
Reg: 12-22-07
10-09-20 05:06 PM - Post#2805179    
    In response to acardon

Car is presently up on jacks I just rotated rear wheels seems smooth and quiet. It is not a positraction rear end probably the stock 4:11 rear end that I believe came with the overdrive cars.



 
bobb 
Super Senior Member
Posts: 5774

Loc: paradise
Reg: 09-05-03
10-11-20 09:43 AM - Post#2805256    
    In response to apix17

i would put the car on jackstands and rotate the driveshaft to see if there is any runout. are your wheels hubcentric?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
Red56trk 
Newbie
Posts: 3

Age: 78
Loc: Seal Beach, CA
Reg: 04-23-20
11-03-20 08:57 AM - Post#2806927    
    In response to bobb

You may have a worn rear bushing in the transmission and also some wear on the driveshaft front yoke. It should also leak oil from the rear seal as a result.



 
56sedandelivery 
Gold Supporting Member
Posts: 5909
56sedandelivery
Age: 69
Loc: Everett, Wa.
Reg: 02-26-08
11-03-20 04:31 PM - Post#2806946    
    In response to Red56trk

If the vibration is't occurring ALL the time, but only AFTER reaching 55 MPH, then you have an issue other than in the drive-train, possibly tire/wheel balance or front end issues. Even with multiple attempts at wheel balancing, that's where I would still look; if you've already had this done, then have it redone elsewhere. JMO.
I am Butch/56sedandelivery.





 
apix17 
Contributor
Posts: 156

Loc: San Francisco Area
Reg: 12-22-07
11-04-20 06:48 PM - Post#2807003    
    In response to 56sedandelivery

Thanks so much for your inputs I have checked the driveshaft yoke for wear and seems to be ok the yoke diameter is okay and not much play when engaged in the transmission output shaft Butch I am going to pursue your thoughts on the possible tire problem. I have put on new tires but I would like to install maybe borrow a known good set of mounted tires to see what happens.Will keep you guys posted.Thanks again



 
Mel Foye 
*VIP* Original Founding Member Group
Posts: 5057
Mel Foye
Reg: 09-29-00
11-11-20 04:53 PM - Post#2807517    
    In response to apix17

Well apix17 what have you come up with? Any place that does a spinning balance check while on the car?
I don't know if a weight came off of a brake drum if you could feel it?



 
apix17 
Contributor
Posts: 156

Loc: San Francisco Area
Reg: 12-22-07
11-11-20 05:56 PM - Post#2807528    
    In response to Mel Foye

Mel I have not pursued the problem any further. I presently have the car in my garage replacing all the clutch linkage. Next project is vibration. Thanks for your interest.Will update you when I have some new information.



 
toms57 
Senior Member
Posts: 534

Loc: Caney, Ks, USA
Reg: 10-28-01
11-11-20 07:00 PM - Post#2807534    
    In response to apix17

I had a harmonics type vibration at higher speeds that was cured by finding a tire shop that took extra time with my car. Moved all wheel weights around and put them in the center of the wheel rather than clipped to the outer edge of the wheel. It made a world of difference for mine.

Toms57





 


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