A T-case drop lowers the back half of the transfer case, decreasing the angle for the rear driveshaft, but it also means the front is pointing more up, not down. So if there were a probably with bad driveshaft angle on the front, then a t-case drop would only make it worse. Savvy?

 

How much wider is that compared to a d30

 

Just to emphasize what you are saying here, I chose to not put some adjustable uppers on when I lifted mine and I regret that. I put some adjustable lowers and ran them out to 16-5/8" center to center to get the front axle centered up in the wheel well. But because I left the stock uppers, my pinion angle is way off now at 5" of lift. I had to yank the front drive shaft because the vibration was so bad.

I will have to go back in and put the adjustable uppers on and correct the pinion angle. This totally sux!

 

Look at what I just posted above. At 4.5" you may have some issues being a 2000 model.

 

Well I have fixed lowered so I'll see what happens. I've have 5xj and this is my first one with a LP front axle. And I notice when I had the lift on my 92 my coil springs had a arch in them as if they weren't long enough

 

How does a t-case drop kit only lower the back half of the t-case? If you are putting equal amount spacers between the body and cross member at all four points then you are lowering the whole thing equally.

Maybe there is something I am missing here.

 

Because the transfer case is mounted to something besides just the cross member. If you wanted to drop the front of the transfer case, the engine and transmission would have to come down too. With a transfer case drop, you're actually just tipping the motor/tranny/transfer case back a little.

 

The engine mounts are in front, the trans mount is in the back. when you lower the T/case it pivots on the motor mounts lowering the back of the motor/trans/t-case as an assembly, which lowers the rear ouput yolk, lowers the front too. But makes the front yolk at a higher angle for the double cardon joint to work at. hope that makes sence...

 

I understand now. I just dropped my t-case 1" to get rid of, for the most part, the rear drive shaft vibe after 5" of lift.

Maybe you guys can help me out with my front pinion angle. Right now it is sitting at 0 degrees (straight up and down). The t-case front output shaft was at 5 degrees pointing up. Not sure what it is now that I dropped the t-case.

I had to pull the front drive shaft it was grinding so bad because the pinion angle changed after lifting. I installed adjustable lower control arms and installed them at the length I found in a chart. My stock uppers were close so I decided to keep them on instead of putting on new adjustable uppers. I regret it now because that would have kept the pinion tilted at probably close to the correct angle.

How do I figure out what angle the front pinion needs to be and is there a way to get the upper control arms off and new ones on without taking everything back apart? If so, how do I get the axle to turn forward to get the new length control arm on?

I am kicking myself now

 

I have read that the LP differentials are a bad choice if you are going to lift a 2000, 2001 XJ because of the pinion angle. If you do put a lift on a 2000, 2001 XJ, what size of lift could be put on? If the vehicle stays stock height is it more than strong enough for trail riding and some mild off-roading like that?
Weakness in things show up over time and time has passed by for the 00-01 models to see if any other problems about the LP differential has surfaced. I keep reading to learn more about XJ's but... asking real users of a product gets you correct information. ( I don't know what a small lift would be, I know nothing about lifting a vehicle )

 

I have a 2001 with the RE 3.5" lift which actually netted me ~4.5". I have adjustable upper arms but have them set around stock length. The front shaft buzzes a bit once I'm up to about 70mph. I wheel so little that I just pulled the front DS, it's a 3 minute job.

I intend to adjust the upper arms to tip the axle forward a few degrees, but I'm not sure the best way to do that without unbolting everything on the axle.

 

I have a LP D30 with 9.75" of lift and no issues.....

 

9 and 3/4" lift? Good god that sounds high

 

 

Its high but not as high as what it sounds like. took that much to just clear stock fenders and 35s when turning and what not.