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driveshaft / u-joint angles ...update / pics added

wasted wages

wasted wages

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after installing my doubler, I ended up with the rear driveshaft measuring 31"
flange to flange.

plus now that the transfer is clocked flat,,, the angle seems pretty steep on the transfer case end of the driveshaft.

what is the proper way to calculate the angle....and what is the max angle a 1410 u-joint will live with ?

using a angle finder on the ends of the yoke....the upper one is at 88 degrees and the rear axle is at 75 degrees... 13 degrees difference ?

or is it 13 degrees divided by the two joints for 6.5 degrees difference???

seeing as the rig will never see the road again...how important are the angles..:dunno:
 
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You want to measure operating angle at either joint, that is the difference between the t-case or pinion yoke and the driveshaft angle. No dividing by two, there is an operating angle for each joint.

Max operating angle for a 1410 joint is 37 degrees depending on yoke variances.

There is driveshaft angle info here and here.

My opinion for a rig like yours is point the pinion up, maybe even past 0 degree operating angle (i.e. pointed up too far the way most look at it) to keep it out of the rocks. This, while not *ideal* in thoery, puts less angle on all the joints and keeps your yoke out of the rocks. Even if you match the angles, you'll need a cv rear driveshaft to guarantee no vibes on a truck lifted more than a couple inches.

Stephen seems to be a big fan of cv shafts front and rear but Wally and the race car (miniwally) see 100+ mph through desert courses. My dedicated, trailered rig works just fine with the above setup. Even with a 4 spline front driveshaft :eek1: (up to 50-60 or so)
 
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The real issue here is are you going to be hitting higher speeds (upwards of 50) for any length of time?

No matter I am still a fan of getting the angles correct but with your angles that would be difficult at best. Those are pretty extreme angles though and I don't think its really a good idea to attempt to equalize them.

Without moving the t-case, you would need the axle pinion to be pointing up only 2 degrees

For no vibes obviously a CV shaft but I agree with Chris on this one. Get that rear pinion out of the rocks. Plus if you get tired of the vibes then you can just get a cv shaft and be done with it cause your pinion will already be pointed basically where it should be for a cv shaft
 
OK......maybe I mispoke......the transfer case yoke FLANGE is 88 degrees measured at the flat side of the yoke....I don't think the driveshaft angle is at 88 degrees....that would be impossible....

and the rear axle yoke is pointing up slightly at 75 degrees......measured the same way ...at the flat of the yoke flange.....

I really don't want to have to go to a double cardan joint as then I would also need to change yoke on the T-case...

maybe a few pics would help....I'll read the threads that have been attached... thanks guy's...:waytogo:
 
wasted wages said:
OK......maybe I mispoke......the transfer case yoke FLANGE is 88 degrees measured at the flat side of the yoke....I don't think the driveshaft angle is at 88 degrees....that would be impossible....

and the rear axle yoke is pointing up slightly at 75 degrees......measured the same way ...at the flat of the yoke flange.....

I really don't want to have to go to a double cardan joint as then I would also need to change yoke on the T-case...

maybe a few pics would help....I'll read the threads that have been attached... thanks guy's...:waytogo:
Click to expand...

What's the angle of the driveshaft?
 
OK....here are a few pictures.....I checked the driveshaft angle....looks like 25 degrees...

Transfer case angle...

IMAG0102.jpg




axle end


IMAG0097.jpg



driveshaft angle


IMAG0099.jpg




enough slip on the yoke ????


IMAG0100.jpg
 
wasted wages said:
after installing my doubler, I ended up with the rear driveshaft measuring 31"
flange to flange.

plus now that the transfer is clocked flat,,, the angle seems pretty steep on the transfer case end of the driveshaft.

what is the proper way to calculate the angle....and what is the max angle a 1410 u-joint will live with ?

using a angle finder on the ends of the yoke....the upper one is at 88 degrees and the rear axle is at 75 degrees... 13 degrees difference ?

or is it 13 degrees divided by the two joints for 6.5 degrees difference???

seeing as the rig will never see the road again...how important are the angles..:dunno:
Click to expand...

Going by that the t-case is pointed down 2 degrees and the pinion is pointed up 15 degrees, giving you an operating angle of 23 degrees at the t-case and 10 degrees at the pinion.

You could easily run it as is, you're far from binding (if you're using 1410 joints).
 
Cool !!!

Thanks guys....

I jacked it up,,,rotated it and felt fine.....I will extend and compress the suspenion next and see how it looks.....I'm hoping it won't stack the slip yoke solid under compression......that's my next concern.....:D


I'm keeping the 1410's on the front also.....I run a square tube driveshaft...and need to extend the outer slip tubing 7" ( going to do that this weekend )

will see what those angles look like next....:waytogo:
 
Do yourself a favor and install some u-bolts on those Yokes so your driveshaft don't come flying out. :haha:
 
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