upper control arm question
- Thread starter ffmeltdown
- Start date
Chest Rockwell
Active member
Re: upper control arm question
You gonna get the truck aligned, or attempt to, before telling us how it works out? I'm really looking forward to hearing about the results.
You gonna get the truck aligned, or attempt to, before telling us how it works out? I'm really looking forward to hearing about the results.
95xtreme
New member
Re: upper control arm question
They are going to be test fitted on a bare frame, I have a little do it your self alignment thing here to see if I can get it close. But atleast can figure out if they are close or not even close.
They are going to be test fitted on a bare frame, I have a little do it your self alignment thing here to see if I can get it close. But atleast can figure out if they are close or not even close.
Chest Rockwell
Active member
Re: upper control arm question
Sweeeeet.
Sweeeeet.
ffmeltdown
Donating Member
Re: upper control arm question
Caster would be a factor not easily checked without an alignment machine. The more negitive caster the more wheel wobble occurs at higher speeds but makes it easier to turn the wheel. The more positive caster the harder it is to turn but the more stable at higher speeds. Caster is a non wearing tire angle and is used to offset road crown drift/pull.
Steering axis inclination might also be affected but i know little to nothing about that tire angle, been too long since i performed an alignment.
Caster would be a factor not easily checked without an alignment machine. The more negitive caster the more wheel wobble occurs at higher speeds but makes it easier to turn the wheel. The more positive caster the harder it is to turn but the more stable at higher speeds. Caster is a non wearing tire angle and is used to offset road crown drift/pull.
Steering axis inclination might also be affected but i know little to nothing about that tire angle, been too long since i performed an alignment.
turbodig
Active member
Re: upper control arm question
I have a Fastrax alignment doo-dad if you guys need something to get a better-than-ballpark estimate.
I have a Fastrax alignment doo-dad if you guys need something to get a better-than-ballpark estimate.
blk00z28
Forced to by choice
Re: upper control arm question
I have a question. The post right before my last one that shows the 3 pictures. Why is your shock tower different then a syty one? Mine looks different then yours.. :dunno:
It might not be a big deal, but if they are different, or in a slightly different location/angle this might be a bad idea mocking them up on that frame.. Jmo
I have a question. The post right before my last one that shows the 3 pictures. Why is your shock tower different then a syty one? Mine looks different then yours.. :dunno:
It might not be a big deal, but if they are different, or in a slightly different location/angle this might be a bad idea mocking them up on that frame.. Jmo
mattw
Active member
Daveman2
Autox Blazer
Re: upper control arm question
what is wheel wobble? I've never heard of that being used in terms of caster/camber.
ffmeltdown
Donating Member
Re: upper control arm question
The way it was basically explained to me (a long time ago) was like a shopping cart that has a front wheel that wobbles the faster you push it.
If you move the upper ball joint more toward the front bumper then you will be increasing the negitive caster which i believe changes the weight distibuton on that tire somehow but does not wear the tire.
If you move the upper ball joint more toward the rear bumper then you will be increasing positive caster, again which i believe changes the weight distibuton on that tire.
I think this angle was more of a factor in non power steering vehicles than ones with power steering, as i said though it is still used today to compensate for road crown since it is a non tire wearing angle but can cause either side to pull in that direction. I think with more positve caster. Clear as mud? :tup:
The way it was basically explained to me (a long time ago) was like a shopping cart that has a front wheel that wobbles the faster you push it.
If you move the upper ball joint more toward the front bumper then you will be increasing the negitive caster which i believe changes the weight distibuton on that tire somehow but does not wear the tire.
If you move the upper ball joint more toward the rear bumper then you will be increasing positive caster, again which i believe changes the weight distibuton on that tire.
I think this angle was more of a factor in non power steering vehicles than ones with power steering, as i said though it is still used today to compensate for road crown since it is a non tire wearing angle but can cause either side to pull in that direction. I think with more positve caster. Clear as mud? :tup:
turbodig
Active member
JSM
Active member
Re: upper control arm question
Wheel wobble?? such technical terms here.
I think what your talking about is caster. The relationship of the top ball joint to the lower. EVERY car, aside from maybe an extreme race car has the upper ball joint behind the lower, aka further back. There is an angle formed if you draw a line between the 2 ball joints as looking from the side of the truck. This angle is caster.
The more caster you have the more the vehicle will want to go straight. Less you have the quicker it will react to steering input, and a big concern for us is ruts in the road. I setup any truck I do around 6-7deg of caster.
I have these arms at home, and it truly appears the ball joint location is changed drastically. Sure it might bolt up to the frame but the caster and camber are going to be affected. Get the wrong combination and you will havea death trap on wheels.
I would provide more dimensions, but I have been rather busy last 2 weeks, been home 2hrs in those 2 weeks at most.
Wheel wobble?? such technical terms here.
I think what your talking about is caster. The relationship of the top ball joint to the lower. EVERY car, aside from maybe an extreme race car has the upper ball joint behind the lower, aka further back. There is an angle formed if you draw a line between the 2 ball joints as looking from the side of the truck. This angle is caster.
The more caster you have the more the vehicle will want to go straight. Less you have the quicker it will react to steering input, and a big concern for us is ruts in the road. I setup any truck I do around 6-7deg of caster.
I have these arms at home, and it truly appears the ball joint location is changed drastically. Sure it might bolt up to the frame but the caster and camber are going to be affected. Get the wrong combination and you will havea death trap on wheels.
I would provide more dimensions, but I have been rather busy last 2 weeks, been home 2hrs in those 2 weeks at most.
ffmeltdown
Donating Member
Re: upper control arm question
I've always been not so good at putting together the words thing But thanks for supplimenting my response , its exactly what i said but i put my letters in different order, no biggie :rotf:
I've always been not so good at putting together the words thing
But thanks for supplimenting my response , its exactly what i said but i put my letters in different order, no biggie :rotf: