drive shaft angle Q

[ace138]

specs k5 1988/305/700r/np208

For the rear axle

I'm swaping in a Ford9 and just finshed doing a shacklshackle drop(3 1/2 inches of lift). I don't plan on running a CV shaft, so I can't just point the shaft at the Tcase output. What should angle should the drive shaft be at? I lost my notes on the stock shaft angle, so I kinda screwed myself.

 

[Bent77]

What I ahve noticed a lot on here lately is guys with lots of driveshaft vibrations. I would do yourself the favor and look into the prices for both cv and non-cv.

When I talked to my drive shaft guy before about car drivelines, he said the joints should run parallel. But that is almost impossible to do on a lift

My K5 has a big difference in the case and axle u-joint from running parallel. It is pointed at the case. I just put a cv in it because it drove me nuts on the highway.

 

[broncoman6524]

What I ahve noticed a lot on here lately is guys with lots of driveshaft vibrations. I would do yourself the favor and look into the prices for both cv and non-cv.

When I talked to my drive shaft guy before about car drivelines, he said the joints should run parallel. But that is almost impossible to do on a lift

My K5 has a big difference in the case and axle u-joint from running parallel. It is pointed at the case. I just put a cv in it because it drove me nuts on the highway.

It is possible...but the driveshaft wont like it...

My dd k5 isnt parralel adn it wil vibrate going back and forth in the truck doing about 75. i just slow down...Maybe its my tires though.

Anyway the general rule of thumb is for a non-cv get the angles close and possible to parrallel. Cv just point the pumpkin at the t-case.

 

[Bent77]

Agreed, they won't like it, wouldn't it try either, will most likely snap a joint the first time you point it uphill.
As for using a 208 (still have a SY?), I don't know what other apps are similar so a guy can junk yard it...

 

[Russell]

Just need to make sure that the angle of the u-joint coming out of the case matches the u-joint angle going into the diff. Need to take into account spring wrap when you accelerate, so its usually a degree or two difference.

As long as the angles are the same, the t-case output shaft and the pinion should be spinning the same speed, while if the angle is out, they will rotate at slightly different speeds, making for wicked vibrations.

CV drops the angle down a ton without changing the speed of the inputs and outputs (the two u-joints are always at identical angles), but you still need to make sure that the front u-joint is at a reasonable operation angle.

 

[ace138]

So the general understanding is with the NP208 SY, I need to run a SYE and CV drive shaft. Its not going to be possible to run non CV in this application? I'm going to have to try, I don't have the money right now for a SYE. I'm going to fab up a traction bar to help with the axle wrap. Maybe I can get a good medium, trail and 65 MPH. I'll be pushing 38's TSL with 5.89s. I'm not even sure I can even get it to 65.