rear drive shaft confusion. looking for more real world insight

[brans87]

Looking for more real world insight on the 2 options for my drive line angle issues.

Talked with Tom Woods and they recommend that using a double cardan joint with slip yoke at the end is a bad idea. States old tech and weight at back end of transfer case can cause wear on bearings.

So I am confused as some people say with my angles to use a double cardan joint with slip yoke and some say SYE from Tom Woods http://www.4xshaft.com/SYE_detail.asp

K5 is 87 350 TBI 700R4 208
14 bolt FF
4 inch EZ rides in front
DIY4X shackle flip in rear
Going to run 35's
Not sure any more info needed here


Angles that I know right now on bottom of transmission pan 0
drive shaft tube 20.1
rear bolts on side of rear diff cover 79.1 This is a 14 bolt full float.
pinion pointed up
rear u joint and pinion pretty level to one another angled up

All the binding is going on at the slip yoke.

So can I can get more real world insight from you guys?

Truck is not a rock crawler!

 

[brans87]

There a particular thread for SYE from Tom Woods on the 208 on install process?

Link I can refrencence

 

[nvrenuf]

I imagine the difference in opinions for SYE or not is based on money and the mechanical work required.

With only 4" of lift, I'd think you could shim the vibration out without getting a spendy CV shaft.

Also, if you must, this may or may not be a good start for a CV project - https://ck5.com/forums/threads/high-angle-driveline-rear-shaft-e-brake-kit.330293/

 

[skunked]

You went from a simple 2 joint with parallel yokes like this



to this.....

 

[brans87]

 

[brans87]

Talked with Kurt from DIY4X and don't think shims will do it,

 

[skunked]

Correct me if I'm wrong but I thought you can't get a SYE for a 208?

Secondly, I've seen a lot of slip yoke shafts with a CV. What Tom says is probably right about the weight but how bad is it really?

 

[brans87]

I posted link and it shows 208 and he even told me on the phone they had a SYE for 208. Pricey though and has core charge.

http://www.4xshaft.com/SYE/208TransferCaseGMDesign-32Spline.html

 

[Bent77]

Do a slip and cv. When it craps, go 241 and SYE

 

[skunked]

Do a slip and cv. When it craps, go 241 and SYE

That's what I would do. Check out @wetoolowdingbangow build thread, Sacramento driveline built his with a flange.

 

[brans87]

That's what I would do. Check out @wetoolowdingbangow build thread, Sacramento driveline built his with a flange.

Thinking this might be best way around this obstacle.

 

[CrpMag122]

Thinking this might be best way around this obstacle.

I am running a 208 with the double cardan and plan on doing just as mentioned above. Kind of a morbid curiosity in me to see how long it will last. And FYI I have been very pleased with Tom Woods and their customer service.

 

[Bent77]

Maybe we need an office pool on how many miles it takes before you two kill it

 

[CrpMag122]

It will be interesting. Mine will be driven to and from the trails too, so running it on the interstate may expedite the process a bit.

 

[sweetk30]

call jesse at high angle driveline

or guys in your state . http://www.oliversdriveshaft.com/

 

[JoshHefnerX]

I went round on this w/ mine. Same lift, 14b only a slightly shorter trans and angles were too much, caused a slight 'paint shaker' effect. Had to do double cardan - repositioned spring perches and went ahead w/ the sye. If you change it later you're going to have to have the shaft get a slip section added anyhow. Might As Well do it once and do it right.

 

[frankin5]

I ran a double cardan on a 208 for 15 years without a SYE, without a bushing failure or bearing problem. I have over 60k on that shaft a lot of the time on I-5 at 80 miles an hour. Early Cadillac's came from factory with one. I am still running it with the 241.

 

[brans87]

I called Olivers yesterday and one guy was unsure and big boss was not in there. I would buy from them if they could make it for me.

 

[ZooMad75]

Currently running a cv/slip yoke combo on my 241. Still early, but I've got almost 4,000 miles on mine now with no vibrations. Most of that is highway running with only 4 off road runs.

I've found the combination of a 4" shackle flip with a 14bff on a K5 with a slip yoke 241/208 flat requires a CV shaft. A 14bff is longer in the pinion area compared to a 10 or 12 bolt rear end a K5 would have normally came with. This means the rear u-joint mount is almost 2" closer to the t-case output. It shortens the length of the driveshaft and increases the angles for the joints. Reusing a stock 10bolt shaft with a conversion u-joint without alteration will fail due to both the high angle difference and shoving the slip yoke in further on the t-case during compression potentially causing it to bottom out.

Sure going with a SYE will gain back some length for the driveshaft, which will help the angles and moving the slip out of the t-case and into the shaft. I still think it's smart to stick with a CV even with the SYE though. Which means you'll still have to pay for a upgraded shaft with CV and the SYE.

 

[Richcz28]

I'm running a JT Customs slip yoke eliminator kit on a 208 with a shortened super duty drive shaft.


https://ck5.com/forums/threads/sye-rear-driveshaft-what-type-are-you-running.310267/

@jt152