fig1 illustrates a typical suspension system on a vehicle as supplied by the manufacturer . upper control arm 10 and lower control arm 12 are both attached to the vehicle frame ( not shown ). spindle 14 , which includes wheel mount 16 for supporting a wheel with a tire mounted thereon ( not shown ), is pivotably attached to each control arm through upper ball joint 18 and lower ball joint 19 , the ball joints spaced a fixed distance apart by spindle 14 . fig2 shows the suspension of fig1 with camber / caster adjusting apparatus 20 of this invention replacing the factory ball joint 18 for selective translation of the position of the upper ball joint along a linear distance “ y ”, either inward towards the vehicle frame or outward away from the vehicle frame . when set as illustrated and discussed in greater detail hereinbelow , the effect of movement in the “ y ” direction will be to decrease or increase , respectively , the camber angle established by the plane of the tire and wheel with the vertical plane of the vehicle frame in the direction from front to back of the vehicle . while use with the upper ball joint is illustrated herein , the apparatus could be applied to replace lower ball joint 19 and / or applied at both locations . camber / caster adjusting apparatus 20 , as shown in fig3 through 8 , includes guide assembly 21 and mount assembly 22 . guide assembly 21 includes insert 23 and guide plate 24 maintained at opposite sides of control arm opening 25 ( see fig8 ). mount assembly 22 includes slide 26 having offset stud 28 extending therefrom through opening 29 . ball joint 30 is held at slide 26 by collar 32 . the apparatus is held in relative positions , as discussed hereinafter , by fastener 34 ( for example a flange nut ), ball joint 30 affixable at spindle 14 conventionally . insert 23 is pressed into opening 25 of upper control arm 10 ( and / or lower control arm 12 ) in place of the factory supplied ball joint ( 18 of fig1 ). for camber only adjustment , insert 23 is oriented along the neutral caster angle by alignment of orientation mark 35 on the control arm ( see fig2 ) and a corresponding dimple or other orientation mark 36 on insert 23 . guide plate 24 and insert 23 each have a slot 38 and 40 , respectively , which are substantially coextensive and along which stud 28 is linearly movable . substantially parallel guide ridges 42 and 44 at guide plate 24 maintain rotational stability and guide linear movement of slide body 46 of slide 26 , by guiding engagement adjacent to spaced substantially parallel edges 48 and 50 of slide body 46 . while a particular structure is shown for the guiding and stabilizing interrelationship of guide plate 24 and slide 26 , many different configurations at guide plate 24 and mating configuration at slide 26 could be utilized to achieve the same purpose . for example , the guide ridges may be positioned at slide 26 and the matable edges at guide plate 24 , or multiple spaced channels or a single centered channel could be provided at either guide plate 24 or slide 26 with corresponding structure at the other configured to ride in the channel or channels . insert 23 includes a flange 52 and rim 54 , slot 40 defined through rim 54 . rim 54 extends through opening 25 of control arm 10 and is received adjacent to annular extension 56 of guide plate 24 . ball joint 30 is secured at slide 26 by means of a press fit of ball joint end 58 and slide 26 into collar 32 with the addition of a staking process to provide a material deformation of collar end 60 over annular lip 62 of slide 26 to mechanically retain the unit ( see fig7 ). ball joint 30 may be a factory supplied ball joint and is attached at its other end to spindle 14 using conventional means ( applying nut and pin assembly 64 to lower threaded stud 66 after application thereof through opening 67 of spindle 14 , for example ). when ball joint 30 is connected to slide 26 , it can be seen that the central longitudinal axis of stud 28 is offset relative to the central longitudinal axis of ball joint 30 . this offset provides greater extent of wheel angle adjustability , since neutral adjustment , corresponding to alignment of the central axis of ball joint 30 ( vertical axis in the figures ) with the central axis of opening 25 in control arm 10 ( and thus the central axis of insert 23 ), locates stud 28 near an end of slots 38 and 40 of guide plate 24 and insert 23 . in use , insert 23 is installed into opening 25 of vehicle suspension control arm 10 ( or other selected member ) with orientation mark 36 at a selected position to achieve the desired direction of angle adjustability . for example , to allow camber only adjustment , insert 23 should be mounted with marks 35 and 36 aligned as shown in fig2 and 8 ( caster neutral alignment ), so that the length of slots 38 and 40 of guide plate 24 and insert 23 are also aligned with the guide marks . guide plate 24 , with slide 26 thereat having stud 28 extending through slot 38 , is positioned at the opposite side of control arm 10 . ball joint 30 may be attached to spindle 14 in advance of or after installation of mount assembly 22 at guide assembly 21 with stud 28 extending through slot 40 of insert 23 ( and thus through opening 25 of control arm 10 ) and held by nut 34 . slide 26 , with edges 46 and 48 engaging ridges 42 and 44 of guide plate 24 to stabilize and guide slide 26 , when moved in guide plate 24 allows only linear movement of stud 28 in opening 25 perpendicular to the axis of the opening . this sliding movement provides tire / wheel camber adjustment without affecting caster angle ( when aligned for caster neutral adjustment as shown in fig2 ). when the desired angle is achieved ( with ball joint 30 and the central axis of opening 25 of control arm 10 in a selected relative position ), nut 34 is tightened to retain the interrelationship of the components thus established by securing stud 28 at the selected position relative to the axis of opening 25 and along slots 38 / 40 and slide 26 at guide plate 24 . should readjustment be desired , nut 34 may be loosened and mount assembly 22 of apparatus 20 can be moved inward ( towards the vehicle frame ) or outwards ( away from the frame ) by moving threaded stud 28 in guide assembly slots 38 / 40 until the corrected angle is achieved . the position of apparatus 20 is then fixed by applying sufficient torque to flange nut 30 . as may be appreciated , the apparatus of this invention could be modified for installation in such a way as to affect only caster angle or in such a way as to affect both caster and camber angles . a geometric relationship exists between the upper and lower wheel spindle connections ( ball joints 18 and 19 ) and the camber and caster angles of the wheel to the vehicle . as previously indicated , altering the position of one of the ball joints in the neutral caster direction affects the camber angle in a desired fashion . extending this to caster and camber / caster combination corrections and adjustments , the camber / caster adjusting apparatus of this invention can be used to adjust caster only angles or some combination of camber and caster . if so desired , by rotating insert 23 to another position of orientation mark 36 relative to mark 35 on upper control arm 10 during installation , camber / caster adjusting apparatus 20 can be rotated in a predetermined fashion to provide for adjustment of caster only or some combination of camber and caster angles .