Slip Yoke Engagement - NV4500

Corvette1974

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Pennington, NJ
Hello,

Quick question - After swapping to my NV4500 (over a year ago now) I did notice that the driveshaft was slightly (maybe 1/4 to 1/2 inch) less engaged into the transfer case. I feel it is now engaged too little, and I think it is starting to wear on the output shaft bushing (there seem to be a slightly larger leak and play in the shaft now). Any thoughts on how much engagement there needs to be, maybe with measurements from stock trucks?

If my shaft ends up being too far out, what are my solutions? Should I get an extended sip yoke if available and swap that over, get a new driveshaft made, slip yoke eliminator, etc? Let me know what you guys think.

Once I have this info, I will finally make my NV4500 swap thread. I have waited this long to confirm long term function.

-Will
 

Barrman

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NP208/241? The slip yoke is supposed to be 1" to 1-1/2" from bottoming out against the seal with the truck sitting level. What are you at? Anymore that 1-1/2" away from the seal at rest and a new rear drive shaft should be considered.
 

Corvette1974

Member
493
1
18
Location
Pennington, NJ
NP208/241? The slip yoke is supposed to be 1" to 1-1/2" from bottoming out against the seal with the truck sitting level. What are you at? Anymore that 1-1/2" away from the seal at rest and a new rear drive shaft should be considered.
NP208 - I think it is way further than it needs to be. Check out this shot

20171120_181952.jpg

If the shaft is too short, what are my options? Should I SYE it (if possible) or just see if my driveshaft shop can lengthen the shaft? Or is there a longer yoke available that give the engagement but I wouldn't have to modify the shaft?

-Will
 

Barrman

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That is too far out.

I would suggest a new drive shaft tube or if your rear end is sagging some. An Off Road Design add a leaf which will let you move the rear axle forward an inch. An extra bonus is the rear of the truck will get a one inch boost.
 

Corvette1974

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Location
Pennington, NJ
That is too far out.

I would suggest a new drive shaft tube or if your rear end is sagging some. An Off Road Design add a leaf which will let you move the rear axle forward an inch. An extra bonus is the rear of the truck will get a one inch boost.

10-4 thanks for the thoughts. Based on what you see there, should I bother doing fancy measurements or just tell the driveshaft shop to add 1 inch in length (or more if you think I should do more) I do load this truck down quite a lot, I don't want that bottoming out. Let me know what you think.

-Will
 

Barrman

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I would suggest pulling the axle end off. Then slide the slip yoke in all the way until it bottoms out. Pull it back out 1.5 inches. Mark the slip yoke with a Sharpie or something. Now, while trying to keep the marked line in place. Hole the axle end up and measure how short it is from fitting. That will tell you how much longer the new tube needs to be.

Make sense?
 

Corvette1974

Member
493
1
18
Location
Pennington, NJ
I would suggest pulling the axle end off. Then slide the slip yoke in all the way until it bottoms out. Pull it back out 1.5 inches. Mark the slip yoke with a Sharpie or something. Now, while trying to keep the marked line in place. Hole the axle end up and measure how short it is from fitting. That will tell you how much longer the new tube needs to be.

Make sense?
Makes perfect sense! Thanks again. I'll let you know what measurement I find out. I'll be able to incorporate that into my NV4500 thread.

-Will
 

Corvette1974

Member
493
1
18
Location
Pennington, NJ
I would suggest pulling the axle end off. Then slide the slip yoke in all the way until it bottoms out. Pull it back out 1.5 inches. Mark the slip yoke with a Sharpie or something. Now, while trying to keep the marked line in place. Hole the axle end up and measure how short it is from fitting. That will tell you how much longer the new tube needs to be.

Make sense?
Measured the driveshaft to your instructions - I need the driveshaft lengthened 7/8". I called the driveshaft builder but they were closed today...Will call back next week and let you know.

-Will
 

olly hondro

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tucson AZ
Maybe its just the Skyjacker springs on my truck, but the pin that holds the rear leaves in alignment isn't centered front-to-back. With a 4 inch lift, the driveshaft was too short. I remounted the spring packs the other way 'round (pushing the axle forward), now it's just right. I reckon I was supposed to do it that way to start with :)
 
Last edited:

Corvette1974

Member
493
1
18
Location
Pennington, NJ
Maybe its just the Skyjacker springs on my truck, but the pin that holds the rear leaves in alignment isn't centered front-to-back. With a 4 inch lift, the driveshaft was too short. I remounted the spring packs the other way 'round (pushing the axle forward), now it's just right. I reckon I was supposed to do it that way to start with :)
Haha yeah once you get into the lift world, everything changes. My truck is stock, and it is a massive can of worms if I get into changing the rear suspension. So for now, modifying the driveshaft is actually the easier/cheaper route.

-Will
 
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