View Full Version : 12 bolt to 14 bolt

12-12-2006, 05:20 PM
Now that my 14 is in, I need a rear driveshaft - what should I get? I've been told to get one from a 2wd 3/4ton (also with 14 bolt) and have it shortened. Any suggestions?

Oh yeah, it's an NP205 with a slip yoke.

12-12-2006, 05:43 PM
Sure you need a driveshaft? The 14bFF pinion is pretty short.

12-12-2006, 05:45 PM
Yeah, I need one that's probably 2 inches longer probably, it'll FIT, but I think it might fall out if I flex er out. Also the ujoint is different from the 12 to the 14

12-12-2006, 09:42 PM
most 2wheels have a 2peice rear shaft, stick to checking out the 4x4's for something that'll work

12-12-2006, 10:21 PM
Yeah eh? The yoke comes out about 2 inches further than stock, maybe 1.5, should I worry about it right now? I know when you start flexin the middle of the axle doesn't move much...I could just get a bastard joint for now. Any thoughts?

Here's a question - how LONG are those slipyokes anyway? I could measure it up and see how much is still inside. I don't see splines yet, so I guess that's a good sign.

12-13-2006, 10:16 PM
Sorry, fuckin' NP208C. quit goat-thinkin there for a minute.

Growly Gorilla
12-15-2006, 07:39 AM
when I swapped the 10 bolt out of my 88 Jimmy for a 14bff,I used the stock drive shaft with no problems at all,also had a np208.

12-15-2006, 08:42 AM
I threw in a 4 inch lift at the same time - the UJoint on the 14bolt is bigger than the one off my 12 - The driveshaft would likely work with a bastard joint, it's probably long enough but it's about 2 inches further out on the slip yoke......and I don't want to be known up stave as "Captain Driveshafts-Fall-Out-All-the-time-when-flexed"

Growly Gorilla
12-21-2006, 07:22 AM
I had a 4" lift as well,also had the t-case dropped an inch because of u-joints binding.

In The Zone
12-21-2006, 09:04 AM
if you are worried about it lengthen it but beware if u go to long at stuff u will damage your tcase....
when lenghting it switch up the ears to a larger cup size too match the 14b
as well as check in to a sye for the 208 if available im not sure

do it once and be done with it... then u can probally run the same u joint fore and aft making packing spares much easier..

i did this to my BII running 1350 series front and back.. all 4 joints..

12-21-2006, 10:12 AM
Fronts will be smaller (same as 10/12 bolt), but the rear shaft I got from heavy has the larger cup. I was gonna shorten the new shaft to 2-3 inches longer than my current one.