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NP208 SYA kit

Yeah it helps big time with the binding but in all reality if you have a CV shaft properly setup in a slip format youll never pull it out on a trail/jump or whatever. The only time i could see pulling it out of the tcase is if you were 4 linked. Even with the flex i have i have around 4 inches of slip engagement as a minimum and about 1.25" of compression before i bottom out.
 
I have the same CV setup, with the flanged slip.

I just wondered if it was an issue with the tail housings breaking or something also.

I just like to keep things like that as unmodified as possible, that way parts are easy to replace.
 
Im sure it could happen if it got bound up at speed, thus the CV shaft. Slips are great when setup right. I think they get a bad wrap from bad setups...stock rear shaft, adds 12 inch lift, jumps then breaks,wah.
 
Steeper angle means more vibration and U-joints wear out quicker. It also makes the slip want to bind more and any off-angle forces in the driveshaft are harder on the T-case.
 
When cycling my rear suspension, I only use about 1/2"- 3/4" of slip yoke over 11.5" of static travel, not flex. I assume it is probably less when flexing. (note: This is on the rear shaft. In the front with the shackle on the other end of the drive shaft, I use about 5-6" of slip on my 12" of static travel).

I cant imagine there is much binding going on with that little amount of slip travel, and with a cv back there, the U joint angles are all very little. I have hit 90 on the highway and never had any driveline issues.
 
yeah youll see the extremes with desert/jumping since the axle is doing more movement then with flexing. The front however can be moved more with flex since the pumpkin is obviously offset.

The only time i could get binding was with a 5 inch lift and conventional 2 joint shaft.
 
I think the pinion would have to be outboard of the leaf spring for it to travel farther in a flex setup, than with static travel.
 
I guess it depends on the situation and your flex but for instance 52s are going to be able to have more pinion movement through flex than static travel.

For instance this pic. Theres no way the static could be more than this.



On a non-rockcrawling rig i think youre right.
 
Good point. In that situation you are actually forcing the spring to travel past its static droop...

My brain doesn't work around flexy things :D
 
I think its always good to know all the reasoning behind doing a modification, so I don't see it as a derailment per say.

I personally thought most people just did them because they got to buy shiny new parts :D
 
Deuling said:
I think its always good to know all the reasoning behind doing a modification, so I don't see it as a derailment per say.

I personally thought most people just did them because they got to buy shiny new parts :D
Click to expand...

Yeah it wasnt too bad of a derailment. Just a funny. lol.

I think theres a lot of confusion when it comes to slip yokes. Like theyre a bad thing, when in all reality youre not really gaining anything substantial by going to a SYE. When i had binding issues with my stock shaft i seriously debated doing an sye but it really just came down to spending more money than id like on a "temporary" setup. I will at some point have to get a rear driveline that isnt a slip yoke but thatll be because of a doubler/4 link.
 
Hey AD, I did the SYE for a few reasons.

1) I liked the idea of the shaft collapsing vs. a slip being shoved in and out of the T-case. Whether that's a bad thing or not, dunno, but in my head...

2) Rocks break things. I had to remove my front shaft once to drive home because my drive flange wouldn't come out, had everything rotating. I like the idea of being able to remove the rear without any fuss.

3) I think the longer length is less of a big deal with a CV shaft. You get to point the pinion at the T-case and the CV does the rest. On a non-CV shaft, having the get both yokes parallel can be a bitch, add that to a short shaft and the angles would suck. So, it might be an old wives tail with single joint shafts.

4) I don't have a parking brake and am planning to add a pinion brake to the SYE flange.

5) It allowed me to buy shiny things
 
I agree with a lot of those same reasons. Guess my thought process isn't completely off...
 
K85 Octane said:
Hey AD, I did the SYE for a few reasons.

1) I liked the idea of the shaft collapsing vs. a slip being shoved in and out of the T-case. Whether that's a bad thing or not, dunno, but in my head...

2) Rocks break things. I had to remove my front shaft once to drive home because my drive flange wouldn't come out, had everything rotating. I like the idea of being able to remove the rear without any fuss. Good point, no mess, and not having to worry about plugging the tail shaft with something.

3) I think the longer length is less of a big deal with a CV shaft. You get to point the pinion at the T-case and the CV does the rest. On a non-CV shaft, having the get both yokes parallel can be a bitch, add that to a short shaft and the angles would suck. So, it might be an old wives tail with single joint shafts.

4) I don't have a parking brake and am planning to add a pinion brake to the SYE flange. Great idea as well.

5) It allowed me to buy shiny things - This of course is the only real reasoning you need for mod...
Click to expand...
 
K85 Octane said:
Hey AD, I did the SYE for a few reasons.

1) I liked the idea of the shaft collapsing vs. a slip being shoved in and out of the T-case. Whether that's a bad thing or not, dunno, but in my head...

2) Rocks break things. I had to remove my front shaft once to drive home because my drive flange wouldn't come out, had everything rotating. I like the idea of being able to remove the rear without any fuss.

3) I think the longer length is less of a big deal with a CV shaft. You get to point the pinion at the T-case and the CV does the rest. On a non-CV shaft, having the get both yokes parallel can be a bitch, add that to a short shaft and the angles would suck. So, it might be an old wives tail with single joint shafts.

4) I don't have a parking brake and am planning to add a pinion brake to the SYE flange.

5) It allowed me to buy shiny things
Click to expand...

Don't forget that slip yoke seals wear out faster than fixed yoke seals. So it is kindof a longevity upgrade, too.
 
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