Relacement rear drivesahft - Ford Bronco Forum
 
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post #1 of 10 (permalink) Old 03-18-2017, 07:49 PM Thread Starter
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Relacement rear drivesahft

Good day,

I just replaced the rear drive shaft on 94 ford bronce and pulled off the front drive shaft to repalce the ujoints and found out that i need to replace that shaft also. I did not reinstall the front drvice shaft, while driving it in 2 wheel drive, There was a loud rattle sound and the bronco shakes a little, is that due to not reinstalling the front drive shaft. Or something else. If something else what cound that be?


Thanks

Tony
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post #2 of 10 (permalink) Old 03-18-2017, 07:59 PM
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Quote:
Originally Posted by TonyPark View Post
Good day,

I just replaced the rear drive shaft on 94 ford bronce and pulled off the front drive shaft to repalce the ujoints and found out that i need to replace that shaft also. I did not reinstall the front drvice shaft, while driving it in 2 wheel drive, There was a loud rattle sound and the bronco shakes a little, is that due to not reinstalling the front drive shaft. Or something else. If something else what cound that be?


Thanks

Tony


Shouldn't be. Your t-case shouldn't be turning in 2wd, and if your hubs are free, then your front pinion shouldn't be turning either. Have you tried reinstalling your rear driveshaft 180 degrees opposite? By that I mean disconnect the rear joint, put it in neutral and spin the shaft 1/2 turn and reinstall. Other than that, I'm not sure.


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post #3 of 10 (permalink) Old 03-18-2017, 08:21 PM
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Sounds to me like it's your rear shaft being as it sounds like it started right after you installed the "new" shaft. What exactly did you replace? The front won't make a sound with the shaft out, whether it's in 4WD or not. Try rotating the shaft 180 as MS said but I bet you have something wrong with it.

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post #4 of 10 (permalink) Old 03-18-2017, 08:25 PM
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Relacemtn rear drivesahft

Was the replacement dshaft a used piece? Was it checked for balance? How were the ujoints and CV centering ball? Was the double cardan "floppy" or stiff? All of these could contribute to vibration. I literally just went through this on my rig.


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post #5 of 10 (permalink) Old 03-18-2017, 08:30 PM Thread Starter
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The new shaft is brand new. Its a masterpro shaft, its was pre balanced, when i purchased it. I will try rotating it 180 degrees tomorrow.


Thank you for the help

Tony
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post #6 of 10 (permalink) Old 03-20-2017, 05:49 PM
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What made you think the old drivelines were bad? Just vibrations? or something else. I find it's usualy cheaper to replace things like slip yokes and such than buy a whole new unit.

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post #7 of 10 (permalink) Old 03-20-2017, 07:05 PM
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Did the rear driveshaft get installed correctly in phase? By this I mean were the yokes installed parallel to each other. Google "driveshaft phase" to see what I mean. I find it hard to believe that it came from a shop like that but you never know.

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post #8 of 10 (permalink) Old 03-21-2017, 12:37 PM
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his 94 would have a flange mount style drive shaft. how would having it not In Phase be possible? Unless of course the shaft itself was not built correctly or balanced.

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post #9 of 10 (permalink) Old 03-21-2017, 01:48 PM
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his 94 would have a flange mount style drive shaft. how would having it not In Phase be possible? Unless of course the shaft itself was not built correctly or balanced.
As far as the possibility of the shaft being out of phase, not built correctly could be a way. Since the shaft is splined, it could also be put out of phase by being assembled a spline (or more) off.
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post #10 of 10 (permalink) Old 03-21-2017, 02:10 PM
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For reference while the chain in the transfer case may not be turning, the rear output shaft and the associated parts are all turning inside the case(everything on the right) as is the oil pump..the rattling sound could be from the oil pump retainer letting loose.

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