driveshaft spacer info?

[Datsun720]

I've got some drivetrain vibration at highway speeds, i believe its because my driveshaft yoke does not go in far enough into the transmission. I know they make driveshaft spacers for toyotas, but i have not seen any for datsun/nissan. Anyone know if those will work or where i can get one that will? I have a C200 differential from an '83 4x4 720

 

I was also wondering if i could get away with using some longer bolts and using 4 nuts as spacers between the differential companion flange and the driveshaft companion flange.Any ideas guys?

[datzenmike]

Well after some digging I see you have an '80 720. Obviously that's a custom d/s for it as the 720s were two piece. Has it bottomed out on the cross frame?

 

 

Do you have a picture of it at the tranny end?

[Datsun720]

No it hasnt bottomed out yet, it was touching a bracket under the cab,since i cut the bracket it hasnt touchd anywhere else. I'll try and get the trans pics 2day.

[ggzilla]

It looks like it might be too far out of the trans (though it's difficult to see with that pic). I believe it should come out 1.5 inches with a normal rear axle setup. But I'm just guessing since I don't have a 720 manual with specs.

[Icehouse]

I was going to build a DL spacer at work once, the machinists talked me out of it. They said just take the DL to a shop and have them extend it, the DL is to important to make a spacer, think of all the torque that goes though it. The shear force on the long bolts would be huge.

[Datsun720]

i took the driveshaft out, remeasured the distance from the yoke to the companion flange,took it to a driveline shop n had it lengthend to my specs,tried it out a few days ago, its nice n smooth now :) finally i can go 100+ without worryin i'll break something.