Driveshaft phasing - The 1947 - Present Chevrolet & GMC Truck Message Board Network

RWold · 10-11-2002, 01:33 PM

I have a 67 C20 Auto/2WD. It has a two piece driveshaft with three u-joints and a center bearing. There is no alingment key on the spline at the rear of the front shaft. Oldest son took it apart without marking it for alinment. How do I phase it properly?

Thanks RWold

vfrdude · 10-11-2002, 01:47 PM

As long as the drive shaft itself wasn't disassembled, you should be OK... It's just a matter of having it installed coorectly at the rear end.... In that case there is only two possiblities... Install the driveshaft... drive it. If you notice some vibration - reinstall, rotating 180 degrees... If the vibration gets worse, rotate again 180 degrees (original position). The 'phasing' you read about is the relation of the 3 u-joints to each other.

vfrdude · 10-11-2002, 01:57 PM

After reading your post again, it sounds like it was disassembled... not sure what the relation between u-joints to get the correcting phasing....

crazy longhorn · 10-11-2002, 02:25 PM

you need to veiw the center slip yolk as an extension of the front shaft........in other words, the caps pressed into the slip yolk will be in line with the caps pressed into the front end of the shaft. As vfrdude has aready posted, if it vibrates, take it apart & flip the 2 pcs 180 & reassemble. good luck.....crazy AL

10-11-2002, 01:33 PM	#1
RWold Registered User Join Date: Oct 2002 Location: Seattle, WA. Posts: 1	Driveshaft phasing I have a 67 C20 Auto/2WD. It has a two piece driveshaft with three u-joints and a center bearing. There is no alingment key on the spline at the rear of the front shaft. Oldest son took it apart without marking it for alinment. How do I phase it properly? Thanks RWold

10-11-2002, 01:47 PM	#2
vfrdude Registered User Join Date: May 2002 Location: Oakley, Ca. USA Posts: 137	As long as the drive shaft itself wasn't disassembled, you should be OK... It's just a matter of having it installed coorectly at the rear end.... In that case there is only two possiblities... Install the driveshaft... drive it. If you notice some vibration - reinstall, rotating 180 degrees... If the vibration gets worse, rotate again 180 degrees (original position). The 'phasing' you read about is the relation of the 3 u-joints to each other. __________________ Rudy Fierros '95 Honda VFR750F Used to have a '71 Chevy Stepside, Guards Red, Lowered 4" rear, 3" front, White Oak bed wood, 700R4 w/373 gears until some low life stole it!

10-11-2002, 01:57 PM	#3
vfrdude Registered User Join Date: May 2002 Location: Oakley, Ca. USA Posts: 137	After reading your post again, it sounds like it was disassembled... not sure what the relation between u-joints to get the correcting phasing.... __________________ Rudy Fierros '95 Honda VFR750F Used to have a '71 Chevy Stepside, Guards Red, Lowered 4" rear, 3" front, White Oak bed wood, 700R4 w/373 gears until some low life stole it!

10-11-2002, 02:25 PM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	you need to veiw the center slip yolk as an extension of the front shaft........in other words, the caps pressed into the slip yolk will be in line with the caps pressed into the front end of the shaft. As vfrdude has aready posted, if it vibrates, take it apart & flip the 2 pcs 180 & reassemble. good luck.....crazy AL



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