Chero-King
NAXJA Forum User
- Location
- Up here eh?
Grinder+Fender+cutting= Giving enough room for wheelin' 30's
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2" lift on a '01 XJ
- Thread starter dlafferty
- Start date
- Location
- Foresthill, CA
Wow, this thread may have set the record for total volume of misinformation.
Angle of the rear pinion yoke is the determining factor in driveline vibes. In a two joint system, the output yoke of the T-case and the input yoke of the axle need to be parallel under driving conditions (experiencing a torque load). In the factory condition, this is the case, but not necessarily after the springs are worn/wrapped/sagged.
By installing a longer rear shackle, you have changed the relationship of the two yokes, and forced the pinion yoke upward, taking it out of its parallel relationship with the T-case yoke. A block will not alter the relationship at all under static conditions, but because of the increased torque loads placed on the axle, may force the pinion upward during driving conditions, and causing vibes. An AAL will not usually alter the relationship under static conditions, unless the springs are worn/sagged, and tehn it may restore them to factory geometry.
Bottom line: An AAL is the safest way to add a bit of lift without altering the yoke-yoke relationships.
CRASH
Angle of the rear pinion yoke is the determining factor in driveline vibes. In a two joint system, the output yoke of the T-case and the input yoke of the axle need to be parallel under driving conditions (experiencing a torque load). In the factory condition, this is the case, but not necessarily after the springs are worn/wrapped/sagged.
By installing a longer rear shackle, you have changed the relationship of the two yokes, and forced the pinion yoke upward, taking it out of its parallel relationship with the T-case yoke. A block will not alter the relationship at all under static conditions, but because of the increased torque loads placed on the axle, may force the pinion upward during driving conditions, and causing vibes. An AAL will not usually alter the relationship under static conditions, unless the springs are worn/sagged, and tehn it may restore them to factory geometry.
Bottom line: An AAL is the safest way to add a bit of lift without altering the yoke-yoke relationships.
CRASH
xjbubba
NAXJA Member # 1524
- Location
- santa barbara, ca
I keep seeing 2" lift mentioned as the goal here; 1-3/4 spacers in front don't equal 2, although close. Using a shackle that is 1" longer than stock in the rear will net you ~1/2" of lift.
Whatever lift you ultimately end up with, my advise is to get an angle finder (cheap at Sears) and insure your rear drive shaft angles are correct. With the jeep sitting level, the angle of the transfer case out put shaft should equal the angle of the of the rear pinion shaft; both angles with respect to the surface (level!) the jeep is sitting on.
Whatever lift you ultimately end up with, my advise is to get an angle finder (cheap at Sears) and insure your rear drive shaft angles are correct. With the jeep sitting level, the angle of the transfer case out put shaft should equal the angle of the of the rear pinion shaft; both angles with respect to the surface (level!) the jeep is sitting on.
