Ryan Weaver's 1969 Olds Cutlass S W31 Club Coupe

[Lynn]

Ryan: Nice little spigots for measuring.

Are you sure you want to shorten it 2 full inches? I can't imagine that you would even be able to get it installed (and apparently you did, or you wouldn't be talking about a driveline vibration) if it were two inches too long.

Did you measure free play on the slip yoke with the drive shaft installed and the car resting on all four wheels? If you are at zero, I would think taking off one inch would get you your one inch of free travel. Hate to see you have it shortened TOO much.

What I see in the first pic looks like you still have about a 1/4 inch free play. That would mean only shortening the DS by 3/4 inch. I know sometimes it is hard to explain and show with pics over the web.

Also, do you know the difference in the distance from back of the trans to the Olds rear as opposed to the Chevy rear? If it is more that 1/2 inch, you might need different driveshafts for each rear.

[Ryan1969Chevelle]

Hi Lynn, I know why this post is confusing..... I posted part 2 but not part 1.

Part 1:

I am sorting out the driveshaft this week. The new heavy duty unit is made with 3.5” OD 0.084” wall thickness tube (steel so it is PSMCDR compliant) 1350 U joints, (the rear u joint is half 1350, half 3R) Spicer 27 spline slip yoke. The DS is the same length as original but the SL is much bigger in a few directions and the SL shaft has a step that the original didn’t have..... maybe the DS is too long.... I knew I have to shorten the SL so that should be step one then I can get proper measurements.

I added some measurements of inside the SL and how far the trans output shaft sticks out the back of the trans.

Ryan W31

PS: I installed the original for prom as the new HD DS looked too long, now I am getting this sorted out.