SOA Takeoff Vibe YJ

[broncobuilder]

I just completed an SOA on my 94 yj. I'm currently working out the minor kinks (so my wife is convinced are "kinks" but actually upgrades I buy on Impulse...). One issue I can't seem to get to the bottom of is the rough vibe at take off. Once I'm above 5mph or so it clears up completly...?

I have spent the prior 10 years building early year Bronco's for a hobby, this is my first Jeep venture, which beleive me, has been a fun change of pace.. I know this is usually a drive line angle issue, or related to axle wrap with the applied torque at take off. I insured proper axle angle when welding the perches in place, and extended my rear drive line 2" to insure proper fit...

This YJ was actually my wifes before we married and has become my current project/toy, I want to insure the ride is the same or better as prior to the SOA before my wife wants to take it out for a spin. Any ideas or suggestions would be greatly appreciated......

 

[Snitty]

Did you eliminate the slipyoke?

 

[Joopin]

Yeah you may need an SYE or a T-Case drop.

 

[currupt4130]

Its probably your axle wrapping under take off and the your u joint binding. Look into a traction bar. www.samsoffroad.com has a good one.

 

[redrooster]

Traction bar for sure. It will wrap worse in low range and probably break the yoke or u-joint.

 

[currupt4130]

Traction bar for sure. It will wrap worse in low range and probably break the yoke or u-joint.

I broke off my traction bar last weekend, wound up spit caps and tearing up the yoke... You don't know anyone with a 1330 Dana 60 yoke do ya?

 

[redrooster]

I have a 1310 yoke if you want to try a conversion u-joint.

 

[jay79cj7]

You may also want to look at the transmission mount. That is what caused a really rough vibe on take off for me that would clear up at 5 or 10 mph.

 

[currupt4130]

I have a 1310 yoke if you want to try a conversion u-joint.

Thats what I was running, but I'd like to go back to a standard joint. Oh well.

 

[broncobuilder]

Thanks for all the input guys.... Although I did look into it, I decided not to go with the SYE, I instead extended the drive line 2". This may have not been the best decision, but for budget purposes, I figured it would work just fine. I'll probably go with trac bars at this point. Looking at skyjackers new system, they look very stable but still allowing for maximum articulation. Will post a feedback forum on how well I think they work.......

 

[Snitty]

If you extended the axle back 2", you will have better luck than you would otherwise. Is it a 4cyl or a 6cyl? If it is a 4cyl, you should be fine that way. You can often get away with just dropping the Tcase 1.5" because the 4cyl drivetrain is 2" shorter, making for a better driveline angle. I still suggest doing the SYE though. It is not really difficult and is a great learning experience. All on top of knowing that it is done right. It was the toughest investment on the SOA to talk myself into doing.. but also made me very glad for doing it

 

[broncobuilder]

Thanks for all the feedback folks, I think I'll just coun't my losses on the drive line extension and switch over to the SYE set up. From everyone I've talked to and reading replies, it seems the best route from here eliminating the most amount of stress on other parts. It's the 4cyl Snitty, but would like to swap out for the 4.0 when this one wears thin...