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Old 04-02-2019, 11:01 AM
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Front drive shaft slip yoke clearance?

A while back I picked up a set of slightly used take off RE 4.5 extreme springs to replace the 4 RC springs on my lift.

I installed them this weekend and what a laborious job by yourself. So my question is this. When I did the front springs, jack stands on frame, floor jack supporting the axle and springs at full extension, I could not get the axle on the alignment pins. This was because the front drive shaft slip yoke was at full compression and would not allow the axle to move father back. Needed about one more inch. So I unbolted the front U joint at the pinion and let the drive shaft hang while I got the axle bolted up.

So my question is this normal? Im afraid if I ever got the front end off the ground that I might punch out my transfer case.

Heres a pic of it while setting on static load.

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Old 04-02-2019, 02:49 PM   #2
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Yeah, that's definitely too long. You need a to shorten that shaft, any driveline shop can do it, won't cost much either. I would pull the shaft until it can be shortened just to be safe.

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Old 04-02-2019, 03:20 PM   #3
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Quote:
Originally Posted by mudbug85603 View Post
Yeah, that's definitely too long. You need a to shorten that shaft, any driveline shop can do it, won't cost much either. I would pull the shaft until it can be shortened just to be safe.
Best advice right here. You'll be fine without the front drive shaft for now

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Old 04-02-2019, 03:57 PM   #4
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It needs shortened take that front shaft out now. If you bottom that shaft out it WILL bust the transfer case
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Old 04-02-2019, 09:44 PM
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That’s what I thought. So now that the axle swings in a greater arc moving for and aft more, should the spline shaft and slip yoke be longer for more engagement at either extreme and while the axle is farthest point forward?
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Old 04-02-2019, 09:44 PM
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Thats what I thought. So now that the axle swings in a greater arc moving for and aft more, should the spline shaft and slip yoke be longer for more engagement at either extreme and while the axle is farthest point forward?
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Old 04-02-2019, 11:00 PM   #7
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Take the jeep to a driveline shop when you drop off the shaft, That way the guy doing the work can see what you have, get a proper measurement and set you up perfect.
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Old 04-03-2019, 05:04 AM   #8
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Quote:
Originally Posted by vmxwinn View Post
Thats what I thought. So now that the axle swings in a greater arc moving for and aft more, should the spline shaft and slip yoke be longer for more engagement at either extreme and while the axle is farthest point forward?
Splines are plenty long. Do as Got it at last suggested by taking the jeep to the shop so they can get measurements.
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Old 04-03-2019, 10:19 AM   #9
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Yep as others said, remove NOW and just get it shortened....
Here's mine
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Old 04-03-2019, 05:58 PM   #10
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Before you take the jeep to a driveline shop, measure the distance from the front spring eye to the spring center bolt.
Then measure the distance from the rear spring eye to the center bolt.
Is it possible you got the springs switched end for end?

Good Luck, L.M.
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Old 04-04-2019, 08:49 AM   #11
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Did you have this issue with the front driveshaft length when you had the rough country lift installed? Doesn’t make sense that a taller lift would require a shorter driveshaft unless you somehow shortened the wheelbase.
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Old 04-04-2019, 09:47 AM   #12
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Quote:
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Did you have this issue with the front driveshaft length when you had the rough country lift installed? Doesnt make sense that a taller lift would require a shorter driveshaft unless you somehow shortened the wheelbase.
That's why I suggested measuring the springs from the centerbolt forward and aft. If the measurements match, then something else is wrong.
If the measurements don't match, then the longest end should go to the rear.

Goof Luck, L.M.
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Old 04-04-2019, 08:19 PM   #13
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The re 4.5's have a LOT of arch and as such will move the axle fore and aft more than other springs.... that said, no need to measure... w RE springs, the military wrap always goes to the front
RE 1454 is the front spring and RE 1455 is the rear spring

I just looked at his pic.... his military wrap is in the back.... we MAY have found the problem!
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Old 04-04-2019, 08:23 PM   #14
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Quote:
Originally Posted by Gottagofast View Post
The re 4.5's have a LOT of arch and as such will move the axle fore and aft more than other springs.... that said, No need to measure... w RE springs, the military wrap always goes to the front
Just asking for curiosity, Does that still hold true with a shackle reversal?
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Old 04-04-2019, 08:32 PM   #15
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Yes.... shackles have nothing to do w it...
The military wrap keeps the front of the spring attached so you can keep driving forward and engage the enemy
Got it at last likes this.
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Old 04-04-2019, 08:34 PM   #16
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Thank You Sir. (Salute)
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Old 04-04-2019, 08:38 PM   #17
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EDIT:

Well crap, looks like I was probably wrong on this...

I was going on what someone at RE told me years ago but it looks like the mil wrap generally goes to the frame and not the shackle....

That said, a srs, which I wouldn't run anyhow, would be a custom non stock situation.... The answer would depend on the design of the spring and the setup of the srs in a case by case basis....
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Old 04-04-2019, 10:31 PM
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Quote:
Originally Posted by Gottagofast View Post
The re 4.5's have a LOT of arch and as such will move the axle fore and aft more than other springs.... that said, no need to measure... w RE springs, the military wrap always goes to the front
RE 1454 is the front spring and RE 1455 is the rear spring

I just looked at his pic.... his military wrap is in the back.... we MAY have found the problem!
I wish that was the issue but according to the RE installation instructions the Military wrap end goes to the frame and the open end goes towards the shackle. I have the 1454 in front and 1455 the rear.

Has anyone else had an issue like this with RE 4.5 springs? There is no mention of fitment issues that I can find. For now I have removed the front drive shaft.
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Old 04-05-2019, 09:20 AM   #19
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Well crap....
When I got my first RE springs in 2007 , I had no instructions so I called RE and they told me that the mil wrap always goes forward and gave me the reason I posted above?????
I have now had 3 sets of RE springs w mil wrap forward w no issues....

Maybe go back to LM's measuring suggestion just to double check stuff
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Old 04-05-2019, 09:24 AM   #20
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I just enlarged and read your attached instructions....

From what I see that is for the rear springs so the frame end WOULD be forward.... might double check what they say about the front.

EDIT: I just downloaded their instructions.... they say the same thing about mil wrap at frame in front...

I'd at least still measure em.... either way good luck and sorry for any confusion
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Old 04-05-2019, 12:58 PM
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Ill measure them but it really wont matter because the centering pin is fixed and the springs are mounted the correct direction according to RE instructions. so it is what it is

Im just surprised that no one else hasnt had this issue. Im going to call RE and see what the say.
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Old 04-05-2019, 04:41 PM   #22
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I'd measure them just to make sure they are the right springs, even if they have a part number on them, just to make sure.

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