Extending Axle

[DL13]

Hi all, I am going to lift my jeep from 3" to 4" and I am wandering if I use a yoke from a front axle to extend the rear so I can move the rear axle more center??
The pics should show what I mean.
Thanks for any help.

 

[Bounty__Hunter]

I don't understand what you mean by moving the axle more 'center', unless you're wanting to raise the yoke on the rear axle so it is more inline with the driveshaft and transfer case output. You can only do this if you install a slipyoke eliminator (SYE) on the transfer case so the rear output is a fixed CV type yoke, same as the front output.

A SYE is only offered for a few select transfer cases, 231 and 242 to be exact, so check the model number of your transfer case found on the round tag on the rear cover.

 

[DL13]

When the jeep was lifted 3" the axle move forward which the wheel moved closer to the fender well, so once I lift it another 1" it will move closer, so I will need a longer driveshaft to move the axle back which I'll be using adjustable control arms too.

 

[Bounty__Hunter]

You can get fixed lower control arms for a 4" lift that will return your wheelbase to where it's supposed to be. Have you looked at the slipyoke at the back of the transfer case to see how much lengthening you will need in the driveshaft?

 

[DL13]

On the transfer case I don't have a slipyoke I don't even have a slipyoke on the front ether, the 5.9 came with full CV's, my t-case is a NV249, or was it a NP any way. The yoke for the front, which is circled in red in the pic, it's by the t-case will it work on the rear to lengthen it? Did the question sound bedder? I was never good at trying to explain something. :redface:
When I looked at the rear shaft after the 3" lift was put on it looked like it was puled out about 2" or so for the lift to work, so I'm not sure how much length I need since I don't have a slipyoke. What would be the best way to figure out how much length I need?
Would you like me to tack a pic of the rear and post it? I need to tack one.

 

[Bounty__Hunter]

You can take a pic of the rear, if stock it should be a slipyoke, the yoke should be free to slide in and out of the tailshaft housing as the suspension cycles. The area of clean metal you see exposed after the lift, that's the slipyoke.

Your front driveshaft uses a double-cardan joint at the transfer case, commonly (and improperly) known as a CV joint.

The CV joint is not interchangeable with the slipyoke on the rear output. Your best bet is to have the stock rear shaft professionally lengthened at a driveshaft shop.

 

[DL13]

Ok it is a slipyoke and it is stock. A double-cardan that's what's it called ok.
Well I'm going to take it to a shop than.
Thank you for your help Hunter I'm glad I asked before I did any thing and made a big headache for my self.

 

[Bounty__Hunter]

Have you seen Virtual Jeep Club - Powered by vBulletin as I'm sure there's experienced jeepers close to you that could help as well.

I wouldn't bother extending the rear driveshaft until you get the new longer lower control arms installed, then measure to see how much it needs lengthened.

 

[DL13]

Ya I know Virtual Jeep, I can ask them the best place to go with my shaft.
Ya I plan to what till I do the ares. When I measure do I measure it from the end of the t-case to the end of the shaft were it connects to the yoke on the axle?