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post #1 of 17 Old 12-09-2013, 09:59 AM Thread Starter
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drive shaft question

Hey all, ordered the RK 2.5 stock mod kit the other day, installing it over the weekend.

I know a lot of people say that they end up getting a good deal more lift than 2.5 in the front. Do you all think I'll have any problems with the stock drive shaft? I don't plan on doing any offroading for at least another season or two, waiting on the stock rubber to wear out before I put better tires on.
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post #2 of 17 Old 12-09-2013, 10:24 AM
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My driveshaft will touch my crossover pipe when flexed out but as far as the joints go. I've had my lift on for about 9 months and no cracks in the boots or vibration issues. I wheel mine pretty hard with the stock rubi tires.


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post #3 of 17 Old 12-09-2013, 10:34 AM
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If you are not wheeling you should be fine with the stock drive shaft. You could also add a limiting strap at the differential to keep the driveshaft from making contact with the exhaust.

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post #4 of 17 Old 12-09-2013, 05:53 PM
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It really varies from Jeep to Jeep. I have a JKU with a RK 2.5" Max Travel Pro lift and my front stock driveshaft has vibration between 55-68 MPH. My mechanic tried to adjust the camber from 6 to 5 degrees to fix it but it's still there. I am now saving up for aftermarket driveshaft's. Some Jeep's never have a problem and some Jeep's do. It's just a roll of the dice. I hope you have no problem's with yours.
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post #5 of 17 Old 12-09-2013, 05:54 PM
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..Still stock driveshafts here, 72k miles and pretty good amount of flex. I did repack the grease in them however.

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post #6 of 17 Old 12-09-2013, 05:56 PM
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Quote:
Originally Posted by floridajpr View Post
It really varies from Jeep to Jeep. I have a JKU with a RK 2.5" Max Travel Pro lift and my front stock driveshaft has vibration between 55-68 MPH. My mechanic tried to adjust the camber from 6 to 5 degrees to fix it but it's still there. I am now saving up for aftermarket driveshaft's. Some Jeep's never have a problem and some Jeep's do. It's just a roll of the dice. I hope you have no problem's with yours.
He should be setting your Jeep's Caster to whatever the pinion angle will allow for. With the CV joint in the stock driveshaft, vibes aren't very common...

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post #7 of 17 Old 12-09-2013, 05:57 PM
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Not sure what year. But running the RK 2.5 on my JKU. I did have an issue with the clamp on the boot hitting the trans pan with the stock driveshaft.

Swapped it out with a coast and clears the trans but will still rest on the skid at pull droop.. But I had no vibration or join issues with the stock one after a few years

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post #8 of 17 Old 12-09-2013, 06:38 PM
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You'll be fine with the stock shafts. I've run stock shafts on an 08, 12 2 door, and 12 4 door with the stock shafts in tact. All on RK 2.5 and 3.5" systems.

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post #9 of 17 Old 12-09-2013, 08:05 PM
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Front shaft started spitting grease soon after installing my RK 2.5's. Replaced with a Adams shaft.
Rear is still holding strong at 10k. I picked one up from this forum for a spare.


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post #10 of 17 Old 12-11-2013, 03:46 PM
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I'm running the stock shaft with 4-1/2" lift (over 5 inches actual measurement). So far so good and I have tested it to full droop and the CV still has a couple of inches more drop left beyond what the shocks will extend to. You might have an exhaust clearance issue, but at 2-1/2 not likely. If you do, you can gain a little clearance with spacers, or get the aFe cross over pipe that eliminates the problem entirely. I'm running 2-1/2 degrees of caster and 3-1/2 degrees up angle on the pinion with no vibes. So with your lift I don't think you have any driveshaft worries.

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post #11 of 17 Old 12-11-2013, 05:08 PM
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I tried the 3* caster and my 2 door was too sloppy.
I don't know if a 4 door will be different.
All I know is it did not work for me.


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post #12 of 17 Old 12-11-2013, 05:09 PM
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Quote:
Originally Posted by Goodysgotacuda View Post
He should be setting your Jeep's Caster to whatever the pinion angle will allow for. With the CV joint in the stock driveshaft, vibes aren't very common...
Mechanic had the driveshaft set to what the pinion angle would allow for and it had the vibration, he changed it from 6 deg to 5 deg to see if it would help but it didn't. He said 6 deg is the norm for the RK 2.5 lift. It drove like stock at 6 degree castor but would slightly vibrate around 50-65 MPH. When he changed it to 5 degree castor, it's a little squirrely and I still get the vibration around 55-68 MPH. I am just going to get a new driveshaft's when funds allow. Like I said before some Jeep's have no problem's with vibrations and others will.

Last edited by floridajpr; 12-11-2013 at 05:19 PM.
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post #13 of 17 Old 12-11-2013, 05:11 PM
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Quote:
Originally Posted by RiverCityOffroad View Post
You'll be fine with the stock shafts. I've run stock shafts on an 08, 12 2 door, and 12 4 door with the stock shafts in tact. All on RK 2.5 and 3.5" systems.

Marcus
2007-2011 are completely different than 2012-up.
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post #14 of 17 Old 12-11-2013, 05:15 PM
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Quote:
Originally Posted by floridajpr View Post
2007-2011 are completely different than 2012-up.
The length is a bit different and the exhaust routes a little differently around them, but they are the same idea.

What were you told makes them so different?

Marcus


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post #15 of 17 Old 12-11-2013, 05:19 PM Thread Starter
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I did pick up a set of exhaust spacers to install while the lift is going in. Hoping things work ok. I have a jcr dagger up front which should help keep it a little lower. Depending on how it rides I can throw the lca's in down the road but hoping is not necessary along with the drive shaft


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post #16 of 17 Old 12-11-2013, 07:18 PM
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Quote:
Originally Posted by floridajpr View Post
Mechanic had the driveshaft set to what the pinion angle would allow for and it had the vibration, he changed it from 6 deg to 5 deg to see if it would help but it didn't. He said 6 deg is the norm for the RK 2.5 lift. It drove like stock at 6 degree castor but would slightly vibrate around 50-65 MPH. When he changed it to 5 degree castor, it's a little squirrely and I still get the vibration around 55-68 MPH. I am just going to get a new driveshaft's when funds allow. Like I said before some Jeep's have no problem's with vibrations and others will.
Squirrelly at 5* ?
RK actually recommends 4.5*, most 2 door guys have to run less. If you are still getting vibes I'm guessing something else is wrong. From what I see on the forums, the stock shafts won't vibrate unless missing a weight or damaged.


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post #17 of 17 Old 12-12-2013, 07:56 AM
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I have the stock shafts on my '13 Rubicon with a RK 2.5 X factor on 37's and I have no issues at all. At full flex the shaft is still 1-2" away from the crossover pipe (I have the Teraflex exhaust spacers) and the joint doesn't look bound up at all. I get a decent amount of travel out of my lift too. I have right at 2k miles on the lift with some light-moderate wheeling.

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