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Car Forum / Antique and Collectibles / Studebaker / April 2005drivetrain vibration....
So I finally drove my '55 today... there's really minimal issues with this car 1) no kickdown to passing gear, will have to readjust throttle pressure linkage 2) fairly serious drivetrain vibration starting at about an indicated 30 MPH (3.31:1 rear) that doesn't go away, just increases in frequency with increasing speed 3) minor brake weirdness - I think the rear brakes may be dragging slightly, but I didn't replace that hose yet nor have I rebuild the master cylinder. I think I can handle 1) and 3) but 2) concerns me a little bit. It almost feels like a bad U-joint but both are brand new. I am thinking one of two possibilities... first, the low ride height in the rear is throwing off my pinion angle and causing the vibration. Or ISTR someone mentioning that you needed shims under the rear end to change the pinion angle when using an early rear end with a one piece driveshaft, true? The other possibility would be something in the transmission, is there any failure mode of a flightomatic that would act like this? I don't think it's a bad flexplate, it's definitely a road-speed-dependent thing and it also doesn't do it when pulling away from a stop. Oh yeah and I discovered I'd forgotten to tighten the rear view mirror, but that was easily fixed :) nate  Signaturereplace "fly" with "com" to reply. http://home.comcast.net/~njnagel Could also be that a needle bearing is not where it should be (in one of the U joints). like it is lying flat againt the end of the "cup", rather than standing up against the side of the cup.. Had that happen before. Jim > So I finally drove my '55 today... there's really minimal issues with this > car [quoted text clipped - 25 lines] > > nate Funny you should suggest that. <g. > Could also be that a needle bearing is not where it should be (in one of > the U joints). like it is lying flat againt the end of the "cup", rather [quoted text clipped - 31 lines] >> >>nate SignatureJP/Maryland Studebaker On the Net http://stude.com My Ebay items:http://www.stude.com/EBAY/ 64 Challenger (Green Wrapper) 63 R2 4 speed GT Hawk 55 Speedster 50 2R 10 truck > 2) fairly serious drivetrain vibration starting at about an indicated 30 > MPH (3.31:1 rear) that doesn't go away, just increases in frequency with > increasing speed > Oh yeah and I discovered I'd forgotten to tighten the rear view mirror, > but that was easily fixed :) > > nate Well, that cancelled out my mirror theory!!! <G> SignatureStudeski Claude Chmielewski claudeski@netzero.com http://www.studeski.com Fillmore, Wisconsin 1947 M16 Truck 1962 GT Hawk 1963 Lark 1964 Commander Wagonaire When you figure out what the driveline vibration is, let me know. I've noticed a slight rumble in my Cruiser around 20 mph or so. It seems to go away at speed, but my rearview mirror vibrates quite a bit at 65 or so. The PO replaced the right rear wheel bearing, but not the left. I was wondering if that might be the problem until this weekend. Friday night, the wife and I decided to take the Cruiser to a local fish place. I called some friends and they wanted to go also. Long story short, I ended up with 6 passengers in the Cruiser--it's probably not had that many people in it for 30 years;). Anyway, the vibration was MUCH worse--sort of made me thing of a driveline angle thing. I think I'm going to go ahead and replace the left rear wheel bearing just to be safe and to my knowledge the U-joints haven't been changed yet either. Maybe I should start there. The car only has 54,000 miles on it. Mark 65 Cruiser http://home.alltel.net/anderm/ > > 2) fairly serious drivetrain vibration starting at about an indicated 30 > > MPH (3.31:1 rear) that doesn't go away, just increases in frequency with [quoted text clipped - 16 lines] > 1963 Lark > 1964 Commander Wagonaire Long story > short, I ended up with 6 passengers in the Cruiser--it's probably not > had that many people in it for 30 years;). Anyway, the vibration was > MUCH worse--sort of made me thing of a driveline angle thing. Did any of the passengers hear the moise or strt yelling, on no, we are all oing to die? Our 47 coupe had a low growl vibration between 2nd and third, could never find it. new owner hers it. BG No passengers screamed or anything like that, but the vibration was noticably different with that many passengers than it is when I'm the only one in the car. Didn't Loewy say "weight is the enemy"? He was darned right. Mark I got about $300 knocked off the price of Linda's Hawk.. because of a major "rumble" in the rear end, when driven with 4 people in the car. I knew exactly what it was (weak springs).. but still expressed concern. At least it paid for the new springs.. but there was no real mechanical issue. Ray > No passengers screamed or anything like that, but the vibration was > noticably different with that many passengers than it is when I'm the [quoted text clipped - 3 lines] > > Mark Weak springs huh? I never did notice if I had a lot of squat in the rear. If you haven't changed out "all" the engine/tranny mounts...definitely do so....I also concur on the spring theory too. Have fun with the ride height.....And remember: At assembly line check out, Studebaker determined "ride height" with a full tank of gas and 2 150lb. persons in the front seat. |
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