Driveshaft question

[scenic760]

So I went to go replace the ujoints in my rear driveshaft and after making a mess and flinging needle bearing all over the garage I finally had them out. I bought new joints on Rockauto per the make/model/year and it looks like I may have, shock and awe, a non stock driveshaft.

The transfer case is an NP208 and it's hooked up (well when it all goes back in the truck anyways) to a th350C. The driveshaft I took out at the rear has a Spicer 5-1310X ujoint at the differential and it looks like the yoke to the transfer case is a 1350...

Everywhere I look it says the yoke (which I need to replace anyways) is for a TH400/NP208 though and I'm wondering if that is going to throw everything out of whack? I have never had the truck running so I'm not exactly sure how it drove before!

 

[scenic760]

I think after getting an Internet education on driveshafts I have a driveshaft from a 3/4 ton 4x4... It is counter bored about 1/4" but I think it doesn't need it for a 1/2 ton application?

 

[SquareRoot]

Counter bored?

 

[scenic760]

Counter bored?

Yes, so the shaft is "counterbored" smooth for about 1/4" to accomodate an o-ring on a transmission. I haven't pulled apart the transfer case yet so I'm not sure if the o-ring is in that or not... however looking at the travel marks on the yoke I can't see 1/4" making a difference either way?

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[SquareRoot]

Interesting. Never seen that before. Thanks for the photo.

 

[scenic760]

Interesting. Never seen that before. Thanks for the photo.

I had no idea what it was either...we can both thank google! I'm not really sure in what application that 1/4" would actually make a difference in?!