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Discussion Starter #1
If you put dual cases in a 4Runner, do you have to change to a CV rear driveshaft? Would this also require rotating the rear axle?
 

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It depends on how short the driveline is, i suggest anything under 3ft with alot of angle go CV, and when you run a CV you need to have about 1 degree of angle on the rear U-joint, so yes, you will have to rotate the rear housing.
 

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I'm running a '85 Xtra Cab, dual cases with 5 inch lift. The rear drive line is 48" long. yes it had vibration. I just put a CV in the rear drive line and the vibration went away.

So to answer your question, if it is lifted, you will need a CV.

<IMG SRC="smilies/usa.gif" border="0"> <IMG SRC="smilies/usa.gif" border="0">
 

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lookin to spend money eli. dual cases are a bit much out here just go with 4.7's and call it a day and you wont have to worry about the driveshaft or cuttin up you're nice new pritty runner. BTW have you got some real bumpers and rockers yet.
<IMG SRC="smilies/bounce2.gif" border="0"> <IMG SRC="smilies/bounce.gif" border="0">
 

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I have an 85 longbed pickup w/ 5"+ of lift and dual cases. I currently have no CV in the rear and I hate the vibrations at 50+ mph and the "spike" during starts. I knew this might happen when I did it, but I was in a rush to get the rig ready for a run, so I took the chance. I'll be calling Jess again very soon. At least I'll have a trail spare.

BTW, I did rotate the axle/pinion.
 

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Discussion Starter #8
Marco-
Why did you rotate the pinion without a CV? The proper angles for a non-cv is to have the pinion parallel to the output of the transfer. A lift shouldn't effect this. A lift WILL increase the angles, and if they become too much then you'd put on a CV and rotate the rear axle.

Maybe the rotated axle is why you're gettin' vibrations?
 

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Discussion Starter #9
Originally posted by turbo4runner:
<STRONG>lookin to spend money eli. dual cases are a bit much out here just go with 4.7's and call it a day and you wont have to worry about the driveshaft or cuttin up you're nice new pritty runner. BTW have you got some real bumpers and rockers yet.
<IMG SRC="smilies/bounce2.gif" border="0"> <IMG SRC="smilies/bounce.gif" border="0"></STRONG>
Rockers are FIRST! I think I might put in lower gears before I do anything else after rockers, because it'll let me go SLOW and help keep this thing pretty <IMG SRC="smilies/biggrin.gif" border="0">

Actually, rockers aren't first, it's snow tire season <IMG SRC="smilies/frown.gif" border="0"> They're next.
 

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I have an '85 X-tra cab with the dual cases and 5" lift, an no cv in the rear. I drive 85 miles round trip daily at 65 to 75 mph and have no noticable vibration. And I have not rotated my axle.
 

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No, a CV is not "necessary". You may find you need it, you may find you do not. I do not need one - 5" or so of lift, dual cases, pinion pointed up a bit, ZERO driveline vibrations.
 
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