Beefing up the Drive Train U-Joint flange

[620Z]

I have been reading a little bit about upgrading the U-Joint on the drive shaft from the standard sized Zed one to a larger one. I have a minor vibration in the car under deceleration and am not sure if this might be the problem since my high horse power might have strained it a little. I was wondering if anyone might have done something in this area or experience a similar problem. The tail shaft is balanced and I don't reckon it is the Z31 half shaft or LSD. So I am narrowing it down.

[sco_aus]

I thought you would have had CV joints, if not, I have some 280zx CV shafts for sale includes companion flanges.

[620Z]

Yeah I have a set of Z31 half shafts (CV Joints) as mentioned above. I think my problem might be the U-Joint or connection between the front of the diff to the drive shaft. I might have strained it when I did some drags a few years back. If I replace it I am thinking I might go the bigger one that is available. This was the site, just wondering if anyone has gone down this track.

https://shell7.tdl.com/~jags/Pages/Parts_DAT_driveshaft_flange.html

[Rod F]

I had a vibration during deceleration. I thought it may have been the bolts or driveshafts, turns out it was the U-joint on the tailshaft.

[620Z]

Hey Rod, yeah I have re drilled the holes in my half shafts and put new bolts in and this fixed it a little. Thanks for the confirmation as that is what I was hoping to hear. A few stories like yours to confirm my thinking. I will have to maybe tackle this U-joint I think and maybe not do any more Drags unless I can find a super big one that will handle the stress. I just want the car to drive and feel like a normal car despit having over 500bhp. I am a bit of a perfectionist and still strive to get this car running as smooth as the Commodore.

[nat0_240_chevZ]

as smooth as a commy,

 

OH NO we dont want that!, rougher rougher!!!

 

craig try this,

 

unbolt the tailshaft from the diff, rotate 180 deg's and bolt back up, worth a try, worked on an old car of mine.

 

if you have tried it already, well as above!!!

 

nato

[620Z]

Yeah good idea Nato I did read something about doing that a while ago. I will suss it out. Mind you for all the work if it costs $100- for a new bigger flange then I would just go all the way straight up. Cheers