Alignment question..
#1
JK Enthusiast
Thread Starter
Join Date: Jul 2010
Location: NW JERSEY
Posts: 111
Likes: 0
Received 0 Likes
on
0 Posts
Alignment question..
Just installed RK 2.5 mod suspension lift on my 2dr. and took it for an alignment. they corrected my toe in slightly and my camber is 2.2. It tracks straight and handles pretty decent. Will it hurt anything running the jeep with cater this low, other than handling characteristics? What i'm getting at is do I need adjustable LCA's to prevent any damage to suspension or drivetrain?
#5
JK Enthusiast
Join Date: Nov 2010
Location: Frostproof FL
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Caster
Caster at that low angle makes it drive very "twitchy" at highway speeds.
Mine was at 3 degrees after the lift and was a chore to drive on the highway.
I obtained 2 sets of take off lower control arms and used them to make a set 3/8" longer. That brought the caster to almost 6 degrees and made a world of difference in how the vehicle drives, both steering and amazingly ride quality.
Plan on posting pictures of how I modified the lower control arms soon .
So as a rule of thumb for every 1/8" you lengthen the LCA you gain a degree of caster.
The mod cost about a $100 to complete, that includes a 21MM socket and cutoff wheels for my chop saw.
Mine was at 3 degrees after the lift and was a chore to drive on the highway.
I obtained 2 sets of take off lower control arms and used them to make a set 3/8" longer. That brought the caster to almost 6 degrees and made a world of difference in how the vehicle drives, both steering and amazingly ride quality.
Plan on posting pictures of how I modified the lower control arms soon .
So as a rule of thumb for every 1/8" you lengthen the LCA you gain a degree of caster.
The mod cost about a $100 to complete, that includes a 21MM socket and cutoff wheels for my chop saw.
Last edited by jlarso; 02-22-2011 at 04:47 AM.
#6
JK Enthusiast
Join Date: Nov 2010
Location: Frostproof FL
Posts: 139
Likes: 0
Received 0 Likes
on
0 Posts
Lengthened control arms
I started with 2 sets of front lower control arms I got from board members.
Shipping only for one set other cost $40 shipped. Both sets were in excellent condition with low miles.
I used a carpenters finishing saw with a metal cut off blade to make the cuts on the control arms. (see attachments). I used a wood block 7/16" thick to set the cut length on one set and then removed the block for the second set. I cut the arms at a 30 degree angle to compensate for losses due to welding.
After the cuts were made I used the longer of the two ends to get a new arm length of 23". Stack length is 22 5/8". There was a loss of 1/16" due to blade thickness.
I spent $30 dollars to have them heli-arced at a local welder.
I cleaned the weld area's with a wire brush and degreased them, primed with an etching primer and painted flat black.
Total cost with a new 6 sided 21MM impact socket and two cutoff blades (available at hardware stores, Lowes and Home Depot) was right at $100.
Shipping only for one set other cost $40 shipped. Both sets were in excellent condition with low miles.
I used a carpenters finishing saw with a metal cut off blade to make the cuts on the control arms. (see attachments). I used a wood block 7/16" thick to set the cut length on one set and then removed the block for the second set. I cut the arms at a 30 degree angle to compensate for losses due to welding.
After the cuts were made I used the longer of the two ends to get a new arm length of 23". Stack length is 22 5/8". There was a loss of 1/16" due to blade thickness.
I spent $30 dollars to have them heli-arced at a local welder.
I cleaned the weld area's with a wire brush and degreased them, primed with an etching primer and painted flat black.
Total cost with a new 6 sided 21MM impact socket and two cutoff blades (available at hardware stores, Lowes and Home Depot) was right at $100.
#7
JK Jedi Master
Join Date: Jan 2008
Location: Austin <--> Colorado Springs
Posts: 11,463
Likes: 0
Received 162 Likes
on
154 Posts
Lengthened control arms
Trending Topics
#8
Sponsoring Manufacturer
Stock caster and steering angles are 4* caster with 2* of pinion angle (up).
When you move the caster to 6* you're changing your DS pinion angle to 0*. That won't work on a lifted vehicle and will cause driveline vibration and could cause a t-case failure.
This is why we designed new 'Unlimited' PR44 housing. Instead of 6* of separation on a stock housing, the Unlimited has 10*. This means you could have 6* of caster and 4* on pinion angle.
When you move the caster to 6* you're changing your DS pinion angle to 0*. That won't work on a lifted vehicle and will cause driveline vibration and could cause a t-case failure.
This is why we designed new 'Unlimited' PR44 housing. Instead of 6* of separation on a stock housing, the Unlimited has 10*. This means you could have 6* of caster and 4* on pinion angle.
#9
JK Jedi Master
Stock caster and steering angles are 4* caster with 2* of pinion angle (up).
When you move the caster to 6* you're changing your DS pinion angle to 0*. That won't work on a lifted vehicle and will cause driveline vibration and could cause a t-case failure.
This is why we designed new 'Unlimited' PR44 housing. Instead of 6* of separation on a stock housing, the Unlimited has 10*. This means you could have 6* of caster and 4* on pinion angle.
When you move the caster to 6* you're changing your DS pinion angle to 0*. That won't work on a lifted vehicle and will cause driveline vibration and could cause a t-case failure.
This is why we designed new 'Unlimited' PR44 housing. Instead of 6* of separation on a stock housing, the Unlimited has 10*. This means you could have 6* of caster and 4* on pinion angle.
But....
Isn't pinion angle measured relative to the drive shaft, and not relative to horizontal?
#10
Sponsoring Manufacturer
Pinion angle and DS angle can be vastly different. Pinion angle is relative to horizontal and not the DS. With a CV type DS you want the DS pointed nearly directly at trans or t-case yoke. With a standard DS you want the trans/t-case yoke within 2* of parallel of the pinion yoke. I'm not sure what the standards are for the funky JK DS.