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Old 05-13-2019, 09:57 PM
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Super short shaft or SYE?

Not sure if this is the correct forum so please move if not. I sold my last TJ (regrettably) but scored another one recently. I'm currently stock piling necessary parts for 35's. I read somewhere that a slip yoke eliminator is needed but the new Jeep already has a super short shaft installed with a cv d/s. Will the super short be adequate enough?

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Old 05-14-2019, 10:09 AM   #2
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a super short shaft would make things worse. im hoping you mean a super short SYE which would allow for a longer driveshaft with a CV joint.
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Old 05-14-2019, 11:25 AM   #3
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The supershort sye is more preferable vs a regular sye because it gives you a longer drivehaft and less extreme pinion angles. I am using JB conversions and it is 2" shorter than my previous advance adapters sye.
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Old 05-14-2019, 05:36 PM
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I do believe it is the super short sye. I don't have an info on it from the previous owner but he mentioned the part. Can't find a part number or company name on it but browsing google images the closest resemblance is JB conversions super short sye.
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Old 05-15-2019, 12:06 AM   #5
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I kind of wish I had a super short shaft, but I have a longer one. And it has not hampered my build up to 4-1/2". Any higher, and I can see where a super short will be needed.


My rear Currie lower control arms are adjusted to their shortest length and the rear uppers are 3/4 of the way extended in order to maintain adequate rear pinion angle.


Not needed, but desirable, if you have good adjustable control arms and track bars.
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Old 05-15-2019, 07:29 AM   #6
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Originally Posted by tardypizza View Post
I'm currently stock piling necessary parts for 35's. I read somewhere that a slip yoke eliminator is needed but the new Jeep already has a super short shaft installed with a cv d/s. Will the super short be adequate enough?
To answer the OP's Q, you say it already has a CV DS. That's your ticket to success, you're good to go. The super short SYE (which it sounds like you meant) is bonus. You could safely go 4" with just a CV DS, and now more with the super short. Front is going to be a problem around 4", though.

Pics for others to comment.
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Old 05-15-2019, 08:37 AM   #7
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Front is going to be a problem around 4", though.
I wouldnt think the front CV Shaft would be an issue until much higher (~8" lift) since it is a very long drive shaft with less intense angles when compared to the rear. I'm only on 3" front springs but I also raised the TC up 3.5" which should be equivalent to about a 6.5" lift as far as the driveshafts are concerned.

it may rub the OEM trans skid cross member, but that should be replaced with an aftermarket engine skid if the jeep is going to be used offroad.
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Old 05-15-2019, 11:35 AM   #8
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X2. I am roughly 6.5" of equivalent lift too when I count in the belly up skid. I am still running my stock front drive shaft.
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Old 05-15-2019, 01:37 PM   #9
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The front shaft issue isn't solely vibes, it's caster. The stock D30 (and D44 if equipped, correct me if I'm wrong) doesn't allow for much around 4 to 4.5 and above. Which causes people to back off and then get vibes. If you have acceptable steering stability and no vibes with greater than 4", you have a good deal.




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Originally Posted by Ironhead Jed View Post
I'm only on 3" front springs but I also raised the TC up 3.5" which should be equivalent to about a 6.5" lift as far as the driveshafts are concerned.
You actually helped by raising the TC. With the engine as the fulcrum, the front driveline angles improved in your case. The rear got worse, but presumably still ok.
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Old 05-15-2019, 02:11 PM   #10
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Quote:
Originally Posted by DougRz View Post
The front shaft issue isn't solely vibes, it's caster. The stock D30 (and D44 if equipped, correct me if I'm wrong) doesn't allow for much around 4 to 4.5 and above. Which causes people to back off and then get vibes. If you have acceptable steering stability and no vibes with greater than 4", you have a good deal.

Stock is 7 degrees caster.


With my 4" lift and belly up I am still able to get 5+ degrees caster and not experience any vibes. Adjustable control arms help with that.
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Old 05-15-2019, 03:34 PM   #11
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With my 4" lift and belly up I am still able to get 5+ degrees caster and not experience any vibes. Adjustable control arms help with that.
Yes, your belly up helps with front drive angles. You have the "driveline equivalent" of like a 1" lift.
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Old 05-15-2019, 03:53 PM   #12
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if the fulcrum was in the middle, that would be accurate, but it isnt. the space between the front output on the TC and the pinion of the front axle increased by ~6.5". the angle may have changed by a few degrees, but nothing extreme
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Old 05-15-2019, 06:52 PM   #13
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I think the only possible DIS-advantage of the SuperShort vs. the standard SYE is that with the SuperShort, you can no longer adjust the speedo calibration with a simple plastic speedo pinion change. With all of the SuperShort kits I've seen, you need to buy an "electronic speedo signal adjustment box" or some such, and splice it in.

Of course once you buy and install the electronic version, you can make all the adjustments you want without purchasing anything else, so I guess it is kind of a wash.
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Old 05-16-2019, 12:14 AM   #14
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if the fulcrum was in the middle, that would be accurate, but it isnt. the space between the front output on the TC and the pinion of the front axle increased by ~6.5". the angle may have changed by a few degrees, but nothing extreme
Jed, I don't know what to say anymore. This just isn't accurate. Distance or space has no bearing in this instance. It is angles. Distance can affect angles, but angles are the determinant. And indeed yes, angles changed appreciably for u-joint consideration when you raised the tcase.

Sounds like you also have the fulcrum issue backwards. If center was the fulcrum, raising the tcase would have made things worse. But fulcrum is the motor, as I safely assume you didn't do a like 3.5" mml (which is basically impossible, of course). In this case, ie rotation around the engine, the tcase front output shaft points less up than it does in stock config, thereby reducing the front driveline angle. Driveline angles are sensitive to 1 and even 1/2 degree, making the slightest change important.

Bottom line, assuming no like mml: raising the tcase counteracts a suspension lift, in terms of front driveline angles. It compounds a suspension lift, in terms of rear driveline angles. There's no way around the geometry.

With all due respect.
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Old 05-16-2019, 08:27 AM   #15
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of course it moves the angels a bit, but I do not believe it is as drastic as you claim.

either way, the front driveshaft has zero issues at 4" of spring lift.
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Old 05-16-2019, 07:01 PM
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Sorry I've been late to respond. Heres some pictures of the backside of my t-case and rear driveshaft. Like I said I'm not sure on the make but the closest resemblance I've found is the JB conversions.
[IMG[/IMG]

[IMG][/IMG]
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Old 05-16-2019, 07:36 PM   #17
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thats a very nice upgrade

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