The Official SYE (Slip Yoke Eliminator) Thread *All Read* - Page 8

ThxDex · 03-13-2008, 09:35 AM

Hello guys ... help a Jeeper from Europe please ;-)

Problem -SYE and still vibes on my 1997 XJ :-(
I read a lot, i tryed a lot but my Jeep still vibes starting at 65mph. As our speed limit here is 80mph and its my daily i want to have it as comfortable as possible and not vibing and humming on the highway.

Setup is 2" lift, 4.0 with 242, Hack n Tap Kit, Tom W. CV cardan. Axel is shimed with 2,5 degrees so the diff yoke is slightly below the cardan - angles should be perfect this way. Tires are okay, all u-joints are new, all wheel bearings are new, motor mounts look okay.

Is there anything left to check that could cause my vibrations?
Can a bad differntial bearing cause vibrations? (because i have some noise from the rear Dana 35 i guess).

Thanks!
Ingo

1badxj · 03-13-2008, 10:27 AM

Quote:

Originally Posted by ThxDex

Hello guys ... help a Jeeper from Europe please ;-)

Problem -SYE and still vibes on my 1997 XJ :-(
I read a lot, i tryed a lot but my Jeep still vibes starting at 65mph. As our speed limit here is 80mph and its my daily i want to have it as comfortable as possible and not vibing and humming on the highway.

Setup is 2" lift, 4.0 with 242, Hack n Tap Kit, Tom W. CV cardan. Axel is shimed with 2,5 degrees so the diff yoke is slightly below the cardan - angles should be perfect this way. Tires are okay, all u-joints are new, all wheel bearings are new, motor mounts look okay.

Is there anything left to check that could cause my vibrations?
Can a bad differntial bearing cause vibrations? (because i have some noise from the rear Dana 35 i guess).

Thanks!
Ingo

Not likely. But quite possibly a pinion bearing.

born2jeep87 · 03-26-2008, 10:19 AM

Quote:

Originally Posted by ThxDex

Hello guys ... help a Jeeper from Europe please ;-)

Problem -SYE and still vibes on my 1997 XJ :-(
I read a lot, i tryed a lot but my Jeep still vibes starting at 65mph. As our speed limit here is 80mph and its my daily i want to have it as comfortable as possible and not vibing and humming on the highway.

Setup is 2" lift, 4.0 with 242, Hack n Tap Kit, Tom W. CV cardan. Axel is shimed with 2,5 degrees so the diff yoke is slightly below the cardan - angles should be perfect this way. Tires are okay, all u-joints are new, all wheel bearings are new, motor mounts look okay.

Is there anything left to check that could cause my vibrations?
Can a bad differntial bearing cause vibrations? (because i have some noise from the rear Dana 35 i guess).

Thanks!
Ingo

Have you had your tires balanced recently?

Highway 4x4 · 03-29-2008, 11:02 PM

I did my SYE today. AA/ Woods. Did it alone in the garage. Never had a TC apart before. All went well except I struggeled a little putting it back togeather. Could not have done it without the help here. When I get this thing done I will have to post some picks. I have spent some $$$ but saved some doing it all myself. I got the Woods DS, all heavy duty, it's a beast. My D35 is now the weak link.

trailblaze · 04-01-2008, 04:07 PM

highway 4x4... post up more on the aspect of doing this with no t/c internal work expericance... i might give it a shot... i like the fact i can use one d/s as a spare!

also, i've read through this and have seen posts saying you have to use a np231/aw4 front driveshaft....i assume someone measured would know the length differences between the 242/aw4 front shaft and the 231/aw4 shaft???

mall_crawler · 04-01-2008, 04:09 PM

Quote:

Originally Posted by Highway 4x4

My D35 is now the weak link.

Nah

trailblaze · 04-01-2008, 07:40 PM

kyle... anyone .... i am half way though the rebuild of the older 242/aw4 shaft...am i wastin time?

Highway 4x4 · 04-01-2008, 11:31 PM

OK, for those that are just thinking about doing it but not sure. Watch and read all you can find on the net about this. Get some good snap ring pliers. If you can get a person to help, do it. You don't need to pull the TC but it might be easier to put it back togeather on a bench. Remove the front DS yoke nut first. Keep the area clean!. Have the TC and underside clean before you start. Start in the AM, durring the week is best so there are more people to call for help if needed, tech lines. Don't wory about a bunch of parts falling out, they won't. Get a tube of the mopar sealer for trans pans, it works and is made for ATF. Double check the pick up tube for the oil pump. Good luck and have fun.

trailblaze · 04-02-2008, 12:54 PM

edit:

OK, it's official. xj aw4/231 front shafts are the same length as xj aw4/242 front shafts... and I'm 99.87 % sure.

weld to weld they both are 19" and the "sliding" parts are both 7"....unless there is something i overlooked , it should be exact.

yeah, had to crawl under the jeep.... not knowing was killing me.

now i can stop bringing this back to the top

crateampscal · 04-07-2008, 11:41 AM

That helps a lot. Thank you

BTreff-XJ · 04-09-2008, 09:44 PM

I've read this entire thread and I'm left with a question. First though a big thanks to the OP for starting this thread and consolidating all the information.

On it's way to me right now is an OME 3" kit and I'll be running 31's. I have a '98 XJ - 4.0L NP231 but I have a manual tranny. I was hoping to get the HD SYE kit and run a front driveshaft from a post 91 NP31/auto XJ but I have read that the manual tranny is shorter than the auto trannies meaning I would need a longer rear driveshaft. I have not seen any confirmation that I can use a front driveshaft with the HD SYE kit on a manual trannied XJ. Can anyone help out? Is this possible or am I going to be stuck with a H n'T and custom DS. I'd like to go the HD SYE/front DS but don't want to chance it with a DD if it doesn't work and I need to order a new custom driveshaft. Thanks in advance.

-Brian

01TJCRAWLER · 05-30-2008, 07:58 PM

bumb neewbie question here....i have a 01 tj 4.0l 5-speed with a dana 35,2" tera-flex susp lift,and really need a sye due to vibrations...does anyone know what the new drive shaft length will need to be collapsed/extended??

chris

winkosmosis · 06-14-2008, 06:38 PM

Planning to do SYE whether or not I feel vibration after lifting. How much should labor cost for installation of an SYE kit like the JB or RE? I can't do stuff like that or a lift install myself because I don't have a garage or even a driveway.

afguy · 07-09-2008, 12:46 PM

After reading this and looking up prices I dont think the H&T with spicer flange is really worth the savings. $100 for the H&T and $80 for the flange when I can get a full SYE for just a bit more and it bolt right up, not to mention it would have a bigger shaft.

**slvrathlon** · 07-09-2008, 01:26 PM

Quote:

Originally Posted by winkosmosis

Planning to do SYE whether or not I feel vibration after lifting. How much should labor cost for installation of an SYE kit like the JB or RE? I can't do stuff like that or a lift install myself because I don't have a garage or even a driveway.

I've been quoted in between $160 - $250. I just purchased the JB and sourcing a Drive shaft.

This was full install. Removing T-case, SYE, shaft install.