drive shaft angle issues
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Senior User
Joined: Jan 2009
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From: easton, CT
drive shaft angle issues
i got a 79 bronco lifted 6in with dana 60 going in the front and a sterlin 1.25 in the rear already i had to shorten the drive shaft in the back to get it to fit right and i just blew the cv joint in the back is there any way to drop the tcase and could i shim the axle more the blocks thats its got have some slant to them so idk if i can put shims ontop of that or if that will be unsafe, any suggestions or things you guys have done would be much appreciated
thanks
nick
thanks
nick
Elder User
Joined: Apr 2009
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From: Upstate New York
I have 6" suspension lift on my '78. I also have a drivetrain that's moved rearward 4 inches, making the shaft angle even worse. What I did was, I took a shaft from a newer truck, and cut it down to fit with a lathe. I used the stock joints and double cardan from a 83 bronco.(these are quite a bit bigger than my original '78 parts, but yours should already have the bigger pieces if it's a '79) But if you're using the larger rear, maybe you could find a shaft with even bigger joints and a matching huge double cardan? I'm not sure what's available for the big stuff. But of course, bigger joints and double cardan are better, assuming they don't bind.
My truck's rear housing is shimmed to bring the pinion up in line with the driveshaft. The pinion is pointed right at the t-case yoke. You should have close to zero angle on that lower joint. This way, the double cardan does the work, NOT that single lower joint. I've run mine like this for about 8000 miles now, with no failure, and no vibration, even with the torque. I think I have about a 1 or 2 degree angle on my lower joint, but under acceleration, the pinion rises slightly, bringing the angle to damn near zero.
My truck's rear housing is shimmed to bring the pinion up in line with the driveshaft. The pinion is pointed right at the t-case yoke. You should have close to zero angle on that lower joint. This way, the double cardan does the work, NOT that single lower joint. I've run mine like this for about 8000 miles now, with no failure, and no vibration, even with the torque. I think I have about a 1 or 2 degree angle on my lower joint, but under acceleration, the pinion rises slightly, bringing the angle to damn near zero.
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Senior User
Joined: Jan 2009
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From: easton, CT
ok thanks a bunch i ordered a new driveshaft thats got 1350 joints all around with a bigger cv joint so im gonna try shimmin the axle alittle more and see what happens thanks for the help
Posting Guru
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Thunder, I dont know if you did it on purpose, But the angle is suppose to be about 2 degrees off from pointing straight at the T-case. This allows the needle bearings to roll just a little back and forth for lubercation. Dont ya love it when a plan comes together. LOL
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From: Upstate New York
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