Driveshaft change?s

[waggin'ear]

Nothing is ever easy.

Swapping an SM420/dana 300 into a 131" J10 with a 350SBC.

The rear driveshaft is 4.5" in diameter and has a compressed length of 71".

What is the longest stock rear driveshaft in an FSJ?

Right now it is about an inch short with the new tranny/xfer, I guess that it needs to be lenghtened 2.5-3". The machine shop I went to doesn't carry the 4.5" tubing and they thought it would be to long.

Tom woods said is was too long for his machine and i would need a 2-piece shaft.

Why can't anything be straight forward, Anyone have a 74" driveshaft or a 2-piece from a 2WD chevy truck laying around they want to give me?

Has anyone else swapped this drivetrain into a LWB truck?

What a PITA!

[ March 11, 2003, 12:23 PM: Message edited by: waggin'ear ]

[greasyjeep]

Would a CV take up the slack?

[greasyjeep]

Maybe a 3/4" clocking ring would also help and you could get the D300 up and out of the way?

Those 2 may get you your 3" needed?

You may also want to try a big truck junk yard.
They have all kinds of cool Drive line options, usually for real cheap. Just bring a tape measure.

[waggin'ear]

I think a clocking ring is out.

I used a Novak Adapter and I don't think the tranny output shaft has enough length to for additional space.

Thanks for the idease though

[waggin'ear]

It's late and nobody cares, but something scotty said earlier combined with this driveshaft crap has got me thinking.

Since I will need a second cross member anyway if i use a 2-piece drive shaft. Maybe i will just try to use the divorced NP200 from the M715 as a second xfer behind the dana 300, and have a twin stick and a crawl ratio of 130:1.

Hmmm, Time to get out the tape measure....