1 Piece driveshaft
Is anyone running a 1 piece driveshaft in their burb? I had one made back in the 90's, but it seemed to vibrate more than the 2 piece, even with new U-joints. I have some literature from GM on the '65 Chevy trucks, and it says that the 'burbs all had 2 piece shafts but the pickups only had a 1 piece. Is there a reason for this. I'm wondering if I should take my 1 piece to an actual driveline specialist and have it checked, as it has regular washers as weights on it, and it was done by a muffler/ driveline shop. :chevy::gmc2:
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Re: 1 Piece driveshaft
i piece driveshaft on my 1963 gmc
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Re: 1 Piece driveshaft
My '60 GMC suburban and my old '60 GMC truck both had factory one piece driveshafts. I think maybe the two piece shafts might have come out when they changed the frame in '63.
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My '66 Brub has a one piece driveshaft. I assumed all Burbs and shortbed trucks had one piece driveshafts, and all longbeds had the 2 piece. I've not seen a shortbed or Burb with a 2 piece driveshaft.
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Re: 1 Piece driveshaft
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66 burb here with two piece drive shaft...
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perhaps it is the ones with the 4 speed that have the 2 piece and the 3 speed and a/t with the single d/shaft???
ron |
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I learned from a previous project that driveline vibrations can be associated with the angle of the trans and pinion. Regardless of either 1 piece or 2 piece, the trans and pinion angle have to be the same.
I learned this after finding out the previous owner of my '69 C30 had shimmed up the trans mount about 1/4". I found a good website that explained it all, I wil try to find it again and post the link |
Re: 1 Piece driveshaft
My '66 Sub is all original and has a one piece. It has a 292/Powerglide
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Thanks everyone. Mine is the 2 piece, factory. It originally had the 292, with a P/G trans. The biggest problem I had was my carrier bearing kept breaking where the spot welds were on the threaded plate. I finally drilled them out and put 4 small bolts, lock washers and nuts on it to keep it together. So far so good, on the fix.
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My '65 has a one-piece shaft.. It's a 4speed with 292... I prefer the heavy 1-piece unit rather than the multi-piece shaft with the center support bearing. Trucks that are 4x4 would obviously benefit from the extra articulation point.
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it does not seem to be make specific either(chev or gmc with different rear suspensions). there must be an explanation for it some where in a 4 x 4 the independent t/case acts as the centre supprt except for the frt shaft ron |
Re: 1 Piece driveshaft
My '62 Suburban (I've cosmetically changed it over to '61) was factory V8, Granny 4spd, 1pc driveshaft, with the slip-yoke built in to the driveshaft.
I converted to a 4spd OD manual trans, and had a new 1pc driveshaft built by a driveshaft shop. My vibrations have more to do with worn shocks, worn rear suspension bushings and worn front suspension. I also lowered the truck a bit, and never got around the resetting the rear pinion angle, though it's probably only out by a degree or so. -Brad |
Re: 1 Piece driveshaft
One piece on mine, was ?/4 speed now 350/700r4.
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My 61 GMC 305 V-6 and SM420 , had the two peice driveshaft. Since the OD conversion, I have a one peice DS.
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Mine from above was 283/PG with 2-piece...??? Anybody see a pattern??
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My burb was converted to one piece with th350 doin the same to my panel.
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Re: 1 Piece driveshaft
My '66 Burb was originally a 283/PG with a one piece.
This is all interesting info., I just don't see a pattern to the one piece/two piece driveshaft situation. I wonder if it had to do with where the truck/burb was built? Mine was built in the Fremont plant. |
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My 63 4x4 is one piece. My 66 LB truck was 2 piece.
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Re: 1 Piece driveshaft
Driveshaft critical speed is what determines the allowable shaft length.
Critical speed (the point at which the shaft bends and starts swinging like a jump rope) is a function of shaft length, diameter, material and rpm (which is a function of vehicle top speed and rear axle ratio). Plus - if there is some odd system resonance that the shaft is responding too that can cause problems. This is why trucks that are somewhat similar might have a difference between one piece and two piece. Could be the same truck but with a different rear axle ratio, for example, that drives the different release. K http://i1016.photobucket.com/albums/...e/100_9727.jpg |
Re: 1 Piece driveshaft
Originally my 1961 GMC suburban (V-6) 2wd had a 3.92 rear ratio with Trac Loc and a two peice DS
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My Suburban originally had 3.73 gears.
Mr. Seymore, I would like to hear your input regarding the standard top mount carrier bearing (as seen in post #5 above) versus the heavier duty carrier bearing that mounts on the bottom of the trailing arm crossmember, as more commonly seen in C20 and up trucks. I'm not a fan of using the light duty top mount carrier bearing with small diameter shafts in a higher horsepower/performance based truck. I have always used the HD carrier bearing and larger diameter shafts with virtually no issues. There is a thread in the 'Racing and High Performance' section, discussing the durability of the LD carrier bearing and shafts in a racing application. |
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I have always converted to a one piece (when I could get away with it) for simplicity's sake. Intuitively, though - bigger is going to be better when talking about center bearings and shafts, in this case.... K |
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Thank you for your reply :)
Regarding the carrier bearings. For me it is a no brainer which one to use, when you compare the two. Quote:
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