Just about finishing off my build on my pathy and i have a question about the amount of engagement i should have on the rear slip yoke. it seems that i have about 2.5 inches of engagement and a total of about 5 inches of spline. I think when it was stock there was about 4-4.5 inches of engagement. i have since moved the axle back about 2 inches. Any suggestions? Oh, heres some pics of the truck. Yes, poser, but its all i have now.

HAHA didn't I just see this rig on npora?
anyway I would think that if you have no more than 95% engagement when bottomed out (so you don't smack the tranny) and more than an inch @ full drop (so you have enough surface area to transfer torque) you should be fine. since you moved it back I'm sure hitting the tranny is not and isue but if suspend it by the frame on jacks and you have less than AN inch I would consider extending it.

Consider getting your DS retubed about an inch longer. Also jack the truck up by the bumper so both rear wheels hang in the air and see how much engagement you have then. You might consider a limiting strap in the middle to limit that if you're close to slipping off the shaft (yeah, that didn't sound right )

quote:

Originally posted by Desert Rat:
Consider getting your DS retubed about an inch longer. Also jack the truck up by the bumper so both rear wheels hang in the air and see how much engagement you have then. You might consider a limiting strap in the middle to limit that if you're close to slipping off the shaft (yeah, that didn't sound right )

Dang, alot of money for an extra inch! haha, i was thinking of running this shaft until i taco it then get another shaft made. I also noticed that some fluid leaks out past the seal, i think it may be because the shaft has some play the last couple inches of travel.

The above posts may be incorrect for your setup...

It should be noted that depending on the location of the front axle mounts...some drive shafts will get shorter as the axle droops and longer as the axle compresses.

I know this is exactly opposite what you would think...I could try to explain it and guess for your setup...but it would be better if you removed the springs and checked for yourself using a jack on the center of the axle.

You should be setup so that you have about 1/2 to 1 inch of extra inward slip (for any shock loads) at its shortest point.

From what you discribe I think your setup is going to have some vibs, leaking, and short bearing life.

The other thing is, if you don't have enough spline engagement under high load, you could end up chewing up the end of your output shaft too, not just the DS.

you did not post any pictures of the drive shaft. You need to have a longer drive shaft made. You want to keep the slip yoke with factory specs. not on a Nissan but I've seen both the slip yoke and output shaft buggered up from lack of engagement.

quote:

Originally posted by LordBiotree:
you did not post any pictures of the drive shaft. You need to have a longer drive shaft made. You want to keep the slip yoke with factory specs. not on a Nissan but I've seen both the slip yoke and output shaft buggered up from lack of engagement.

I was thinking of retubing it 1.5 to 2 inches longer. that was i get the stock engagement of 4-4.5 inches. i'll get pics of the shaft this weekend. i still have alot of handling problems to address too.

Mine stuck out a lot and the angles where bad, so I went with the SYE and a 1310 cv shaft. Worked well except for the sye drive shaft mounting surface had to be milled down more to center the shaft. Here are pics before and after.

quote:

Originally posted by 87pathbuildup:

mine has about a 1/4 inch more engagement than that at ride height. I think i will wait on doing any TC mods incase i go for a doubler setup or an adapter.

excuse me for my poor paint skills.


Both flanges can be removed. They just tap out. I would remove the dust shield on the transfer case. There's about 2"+ before the slip yoke meets the tail output on the drive shaft.

I drove mine the way yours is, and it made the seal leak within days. And just got worse. SYE on now with new DL. I brought my truck to the driveline shop so they could measure.

Im getting mine retubed 1.5 inches longer than stock and with .125 wall dom tubing. If i taco this shaft i shall make my own out of sch 40 pipe.

This pic shows what happened to me with 1.5" engagement, that is also a significantly more bigger part too. Do not skimp out on that, if you do what I did you will be in a whole heap of trouble with the TX10 as you will loose lots of fluid.


http://photos-a.ak.facebook.com/photos-ak-sf2p/v308/25/...69_30021784_7495.jpg

i got the shaft back and it looks like i will have 4 inches of engagement at ride height.