Do I need longer drive shafts? 2.5" lift

[olbronclover]

Do I need to run longer drive shafts with a 2.5" lift or am I ok with the origenal ones?

 

[NYLES]

Youll be OK! unless you got some wild lift with alot of travel, but if it just a 2.5 standard lift youll be fine.

 

[daddyg]

I didn't need to lengthen my drive shafts at 3.5. But I did at 5.5 so I think you will be fine at 2.5.

 

[Broncobowsher]

The front almost never needs changes. The radius arms arc nearly the same as the driveshaft so that is going to be fine.

Rear should be fine with only a 2½" lift. But Broncos don't always lift the same. So there is still a small chance that it may need replacment. But it would have to be marginal with the driveshaft at stock height to begin with.

 

[blubuckaroo]

Better a little short than too long. %) (the driveline!) Too long and you'll wreck your U-joints when the springs bottom out.

 

[broncnaz]

I didnt need it with either 2.5in lift I installed but as others said check the rear shaft just in case you never know if someone happened to install a shorter shaft or the factory just shorted it. usually 3.5in lift is where you start running in to it being close.

 

[Carl]

I asked a similar question a few days ago: http://classicbroncos.com/forums/showthread.php?t=118236

My rear driveshaft looks like this now that I installed the new WH stock springs. My old springs were VERY worn out. So worn that the quarters would rub on my small 215/75R15 tires. The new springs lifted the rear up quite a bit.

Should there be play in the slip yoke? Because mine wobbles a little. I hear a humming sound only when I coast or decelerate. I thought it was due to a bad pinion bearing, but could a wobbly slip yoke cause this vibration?

 

[broncnaz]

Doubt its causing the humming. while not good to have wobbles it shouldnt be a big problem although it will probably cause Ujoints to wear quicker. I start considering either getting it respline or get a new D shaft.
Humming on decell I believe is to much backlash in the rear gears.

 

[DonaldDouchebag]

I lengthened my rear driveshaft when i went with a Wild Horses 2.5" lift. I wasn't cool with so little spline input. I think the entire shaft needed a rebuild anyway.