Excellent suggestion. I just called my mechanic and he's pulling the shaft right now and taking to CCI in the morning. The question of the moment is: What is the CORRECT length of the driveshaft for a 1970 Chevelle SS, 396, M21??? IF anyone knows, it sure would be a huge help to me. Also, where do you take the measurement?
You know, it is just possible that sometime in this car's life the wrong driveshaft was installed and that the NEW driveshaft was made to the same length - thus, BOTH are wrong... Thanks, E -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Malibu65 Sent: Monday, August 12, 2002 2:27 PM To: [EMAIL PROTECTED] Subject: Re: [Chevelle-List] Driveline vibes, baaaad vibes. So this posses a question that's been runnin' round my head for a while. I just installed new U joints because of a vibration that started only at speed, around 4thousand rpm and up. It too would happen with the clutch in and seems to be drive line related. As usual for U joints, I jack the car up from the center pumpkin and use jack stands on the axel housing. I notice after removing the U joint U bolts, that the drive shaft only goes a little ways into the transmission in order to swing the shaft clear of the yoke. I figure if I go over a bump in the road, the suspension will unload a bit and move the shaft/front yoke into the transmission. I used to have a powerglide in it and it was real smooth. So, what is the optimal place for the spline/yoke depth into the trans? Is there a signifficant difference between powerglide and M21? Could this be your problem? ie: drive shaft length BTW the Precision brand of U joints are way beefier than the ones I replaced. -ChuckK According to Craig A. Ellis: > Thanks, Steve. When I first put the shaft on and found no joy, we complained > to the owner of CCI and he came up and checked it out. Said the pinion > flange was shot, ordered new, installed, no joy. We're pulling the shaft > today to do as you recommend... > > U-joints are brand new, BTW. > -----Original Message----- > Craig, > Did you say that driveline was balanced? I'd take it down to > another shop and have them test it. > > Also might try new U joints on both ends. I'd be looking hard at them > u-joints first ..and replace them just for "grits and shins" ( a southern > dish isn't it?) because they are cheap. If the U-joints don't get it, maybe > a balance weight came off the driveline ......if it was ever balanced. A > good driveline shop will tell you quickly. > > Steve > > Brand new bearings all through the rear axle assembly. No play in anything > that I can find anywhere. I don't think it's the front end because it just > does not feel like front end stuff. I've had six different guys ride & drive > the car and all conclude the same - driveline. I keep racking my brain > trying to think if there is something I've missed but every single part is > new. It's really bugging me. > > With the way the axle is positioned by the control arms, it's just about > impossible to get the pinion and transmission flange angles wrong. Besides, > the angle changes constantly so I'm putting that pretty low on the list. I'm > down to crush sleeve, control arm bushings, and maybe drum balance but none > of those really seem likely culprits. I sure am open to ideas, tho'. > > E > > > I have what feels like a driveline vibration that comes in about 45 miles > per hour and increases in intensity until about 65 MPH when you're actually > going so fast that the frequency becomes so rapid it seems to go away. I > don't think it actually goes away, just feels not-so-bad, if you know what I > mean. > It is not engine RPM related - it occurs in second, third or fourth at the > same speed and continues if you disengage the clutch and put the trans in > neutral. So, it is not engine balance related. > I have new Moser axles, US Gear ring & pinion (3.42), new posi clutch pack, > new pinion flange, new driveshaft and it has done the exact same thing with > two completely different sets of tires and wheels. Also, it is not in the > front end. > I'm really at a loss here - the Detroit Dreamcruise is spooling up to max > output right now and I can't motor down the highway. (By the way, the > cruising is so heavy every night this week that the police will shut > Woodward Avenue down on some nights. On Saturday, you're talking a million > spectators minimum. It is said to be the largest motorsports event in the > world, bar none, and it's all muscle cars, hotrods, and other gearhead > doodah.) > If anyone has any ideas, I am sure enough ready to listen. > Craig E. > -- --------------------------------------------------------------------------- [EMAIL PROTECTED] [EMAIL PROTECTED] `65 Chevelle Malibu 327 4 spd --------------------------------------------------------------------------- ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED] ----------------------------------------------------- To Unsubscribe please visit www.chevelles.net/list.html To start a new topic, send mail to: [EMAIL PROTECTED]
