yorkee

I have a 2001 xj and thinking of regear. The cheapest route I found is to swap in a 4:10 axle.

I can find a HP D30 with vacuum disco in 4.10 locally. Should I go for it? Or I should hold out until I find a HP 30 without disco?

I am not into crazy rock crawling, but I want my rig to be as strong as possible as a trail rig thats still capable of DD.

Everyone said vacuum disco is bad, but I could take advantage of the MPG saving (if there is any) because it drag less moving parts, right?

lukc22

Are you going to run the vacuum lines?

XJmember

You can also get a cable actuated system for it, aka a posi lock. You can also make one for it to, I've seen write ups somewhere on it before.

The MPG gain will be very marginal if any Id say.

caronaxtr

I believe you can swap in a passenger side axle shaft from a non - vac. disconnect axle &weld a patch over the cover & you'll be better off.

In all reality, I'd check out your P&P's. I found 3 XJ's w/ HP30's & 8.25's. $100-$150/axle when I was there last.

XJmember

You could do that too, no need to really weld the plate over the shift fork location, you can use the 4 bolts to attach a flat plate.

2000chersport

Rustys sells the kit to delete the vacuum system. It's $18. Just swap in your passenger axle shaft in from your LP dana 30
http://www.rustysoffroad.com/rustys-...-seal-kit.html

emptypockets

You have to change the seals as well. If you've ever had a disco shaft next to a non-disco, you can see there is a difference.

lukc22

Seems like alot of work, to me... Trading 1 issue for another?

2000chersport

The rustys kit comes with everything including the new seal. It's $18
http://www.rustysoffroad.com/rustys-...-seal-kit.html
Just use the 1 piece axle shaft from the LP dana 30

sreeb

With 4.11 gearing?

I believe you can swap in the axle shafts from your current LP axle. You will need to change the seal on the disconnect side. A metal plate bolted on in place of the vacuum assembly will cover the hole. Just a dust cover really since you are relocating the seal in board.

sreeb

The vacuum axle shaft itself looks strong enough but it uses the small u-joints....

emptypockets

The thought is that the CAD housing is stronger than the non-disco style. I beat on mine for many years before finally going to the non-disco axle. Off the shelf trusses won't work on it, so if you ever plan on doing that know ahead of time you'll be fabbing it yourself. The right UCA mount is also pure beef compared to the non-disco. MPG savings is not even worth considering. You can also run your larger 5-760X u-joints shafts.

cruiser54

Just do this with the HP front axle:

https://www.cherokeeforum.com/f51/fr...ss-91-a-38629/

HS00XJ

I not convinced they are stronger. I would hold out for a non disco axle.

emptypockets

Isn't that the one that broke when someone was jumping their XJ? I ran my CAD axle for 4 years and I don't run easy trails.