Custom driveshaft question

F350stroker · Apr 23, 2015

On the front yolk off of t-case how many inches of slip do you need to make it strong enough? I have it measured out that I would have 2.5 inches for it to slip in before it bottoms and it would be slid on the shaft 2.75" . Would this make it strong enough and allow for enough movement when the suspension compresses? This is on an ext cab short box truck with 2006 axles under it, Also a neat side note is that the front drive shaft off of the 1990 doner f-350 bolted right in with no modification.

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FrankTheTank · Apr 29, 2015

Do you have a 250 or 350 and a 4407 or 1356 t-case?

F350stroker · May 8, 2015

My truck is a 250 that started as a 2wd I will have to check on the t-case number that I got for it.

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PSDEng · May 8, 2015

If it has a flange it's a 4407, if it has a yoke it's a 1356

FrankTheTank · May 9, 2015

what I was getting at is the front driveshaft yoke is different for a 250 vs a 350 to accept the double cardan joint.

F350stroker · May 10, 2015

Well it has a yolk at for the front drive shaft with a double cardigan joint, the rear is a splined shaft that the yolk slips on to and that is where I wasn't sure if being engaged 2.75" would be enough.

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mtsnowrunner · May 12, 2015

Do you have front shackles or rear shackles? I have a shackle reversal without bumpstops and I've watched mine close. It only moves around an inch. I ordered mine from High Angle and I believe he uses 5-5.5" slip with about 2" of shaft showing. I would have to say you are pretty close. I don't think I would want any less spline contact than what you have now.

F350stroker · May 13, 2015

Yea I really don't want to damage anything if I can help it. Not that I am making really any more hp than stock but just want to be safe.

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