Almost done, but drive shaft Q's

[dr_claw]

Truck is almost done the swap, but not quite. I have asked a few people, but I couldn't really get a solid answer from any of them. So.... How much slip should your drive shafts have???

Some info that may help,
-not really flexy 2.5" lift in my cruiser
-35's
-350, 420, 3spd case
-light to moderate wheelin ( going to school full time)
-distance between rear flange and output on case= 25.5"
-distance between front flange and output on case= 23"
I am trying to use the original rear shaft in the front, and a mini truck shaft in the rear.



Where should the slip yolk be when my truck is level ect. I really am not sure about anything here, and i really want my truck driving soon.



Your info would greatly be app. Thanks :help

[jeepFREAK]

Take your Truck to Drive Products and get them to Fab you up some driveshafts. They do real good work. I think most of the people here go there.

I didnt even bother doing all those measurements and stuff, i took my jeep straight there and they did all the measurements and installation (no extra cost by the way) after my engine swap. I know you cant really move your truck, but i used a towbar. If you wanna borrow my towbar go ahead (email me), you will have to make some mounts on your bumper for it.

[jeeponrock]

How much slip is going to depend on the type of suspension you have. Long travel suspensions will require longer travel slip joints.

For a standard SOA suspension with shackles on the end of the spring furthest from the t-case, you probably only need a standard slip joint (6" of travel?). You drive shaft will probably move less than 2".

If you've got a shackle reversal up front and you're getting tons of flex, you may need more slip joint. No easy way to tell unless you ramp the truck and measure it.

[Jordan]

Originally posted by jeepFREAK
Take your Truck to Drive Products and get them to Fab you up some driveshafts. They do real good work. I think most of the people here go there.



What kind of cost were you looking at for your drivesahfts with these guys?

[Billy Goat]

Your driveshaft is dependent on a number of factors. Pinion angle etc. Generally single cardon joints max out at around 20 degrees some even less. As the last step in my suspension lift, I just modified my driveshaft from the conventional double joint style to the C.V. style driveshaft. I lenghtened my slip joint and changed over to double cardon due to 20.5 degree angle (no load) on my ~28" drive shaft. Works wonderfully now. No more banging etc from increased angle from axle wrap when under load and too short of slip joint travel. To get a better understanding got to http://www.4xshaft.com/
and read the info under tech info. The heading "Driveline Geometry 101" might be of interest.
cost depends on whats needed or reusable for your shaft and situation. min $300 to max $500