Driveshaft Question

[CrpMag122]

I need some direction here guys. Here is what I have run into. I have an 86 M1009, which is basically a 1984 model built in 86 for the military. After 7 years of saving and selling my Harley, I pulled the trigger on my lift and axles. I have installed the ORD FUSH kit, 6" lift springs upfront from ORD (Alcan), and the rear will be 4" lift springs in the rear with a 2" shackle flip with a 14 bolt underneath. So here is what I have run in to, obviously I need to lengthen my front driveshaft. I have not been able to get the measurements for the new driveshaft because I still have not placed the ring gear and arb up front. Hopefully that will be done this weekend.

So my front driveshaft is a flange mount at the transfer case, that goes to a CV joint, then to the shaft with a slip in the middle. My first question, which I will probably answer my self when I get a full range of measurements with the front suspension at full flex and compression, is how much slip I will need. It's my understanding that the standard from Tom Woods is up to 4". I was wondering if everyone thinks that will be enough, these springs certainly do have a lot of articulation!

My second question/concern is clearance of the crossmember by the CV joint. As you can see in the pic below the CV joint appears to be hitting the crossmember/transmission support. Has anybody else run into this, if so is it an issue? I can't imagine this a problem specific to only my K5 but figured I would ask you all. Thanks in advance.

 

[Bent77]

I know you want a fast answer, so start here!

https://ck5.com/forums/threads/how-much-front-driveshaft-slip.324435/

 

[CrpMag122]

Thanks, I read that one already and went back and re-read it. If I am not mistaken I think I will need to complete the entire build before I can get any accurate measurements. That being said, I am in no rush. I have been waiting way too long to rush this project and I want do everything the right way the first time through.

From the looks of it some people have done custom work or have different crossmembers then I do. This is my main point of concern at this time. I am wondering if I will need customize mine a bit.

 

[Bent77]

Yeah, having it together is really the only way.
For running longer front springs, i needed a shim to roll the pinion up 4°

Still having bind issues, so I'm building a high pinion axle

 

[CrpMag122]

Yeah, having it together is really the only way.
For running longer front springs, i needed a shim to roll the pinion up 4°

Still having bind issues, so I'm building a high pinion axle

I guess I better warm up to the idea that this project will never truly be done... Where would the fun in that be? Much to the wife's chagrin I think this was just the first and hopefully most expensive step.