Re: [Chevelle-List] driveline center

[Wayne Kline]

I don't think your abnormality is a "virus" I put both my cars on the lift and measured the relationship of the transmission output shaft and. rear pinion yoke . To the Frames body mount at rear and transmission  cross member mounting holes. Both frames are   Boxed one conv the other an Elky   X'd for being square and laterial to check for Center line. All measurments fell with in .125 or 1/8 Except the Conv whos frame was out .180 (3/16) on the drivers side front.  Upon further examanation you could see it was on a frame machine at one time in it's life . By the elongated/streched body/mount access hole.   IS your suspension hanging when you examined this , with the 4 point rear locating system a whorn bushing might exhibit this phenomenon.   Wayne  ----- Original Message ----- From: Craig A. Ellis To: '[EMAIL PROTECTED]' Sent: Wednesday, September 11, 2002 4:49 PM Subject: RE: [Chevelle-List] driveline center Wayne, I should have noted it's a 1970 SS. The word I got was from a driveshaft manufacturer client of ours (American Axle). They build a zillion driveshafts for GM (pickups, SUVs, etc.). He told me not all vehicles require it - it might even be exclusive to some applications within a specific platform (an "A-Body" is a "platform" in the industry). I never noticed it on mine until I looked and, lo' and behold, there it was.   On the other hand, I also have it on pretty good authority that ANY lateral deviation is bad. Not only am I confused, now I'm worried about how I GOT the deviation! It must be a virus or something...   Moreover, when I look over the whole assembly, I can't see how a deviation could even be introduced. The axle is fixed in position by the controls arms, my chassis is straight and square, the engine & trans appear to be installed perfectly. I am truly mystified. I really need some eyeball input on this.   C -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Wayne Kline Sent: Wednesday, September 11, 2002 4:13 PM To: [EMAIL PROTECTED] Subject: Re: [Chevelle-List] driveline center Like they say, you learn something new every day. But from a birds eye view, looking down the Centerline of the transmission to the yoke then to the rear end yoke. and from my limited knowledge a 10 and 12 bolt rear rear end pinion/yoke is centered in  the housing, ( I just confirmed that on a 64 ten bolt and a 66 12 bolt housing)  I can't understand the laterial deviaion in you car. The notion of zero degree  pinion angle  in relationship to the, drive shaft and transmission,  Is a well documented. But the concentric deviaion of drive train,drive shaft  and rear end is a new one to me.    Wayne   Ps will put my 64 ans 65 on the lift to nite !     ----- Original Message ----- From: Craig A. Ellis To: Chevelle (E-mail) Sent: Wednesday, September 11, 2002 3:34 PM Subject: [Chevelle-List] driveline center My driveshaft is offset a bit left of center when viewed from the back of the car. A driveline buddy of mine says this is deliberate in order to make sure the driveshaft never arrives at zero degrees of offset through the suspension travel. Could you guys please tell me if the driveshafts in YOUR cars are offset at all? By offset I mean laterally. So if you were looking at a "plan view" of the chassis (that is, a bird's eye view), the driveshaft would be slightly left of center at the transmission tail shaft so a slight angle would be present between the trans and the differential. Or maybe the differential would be slightly offset. BTW, this would NOT generally be evident in assembly manual drawings, etc. You'd sure enough see it if the car was on a hoist and viewed from the rear, however. This is important to me in my quest to debug my driveshaft. Also, not all platforms has this offset - only those the engineers determined could arrive at zero at some point in the travel of the suspension. We're only talking about a 1/2 inch or an inch, by the way. Nothing dramatic but you can see it readily. Craig E.