Ingalls 38720 User Manual

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Product Installation Instructions

ING3872-070502

Part Number 3872

CAUTION: Observe proper safety and repair procedures for installation of all chassis parts. Some chassis parts require specialized tools and
experience and therefore MUST be installed by a qualified technician otherwise an unsafe vehicle and/or personal injury could result. Wear safety
glasses and other protection.

WARNING: Before beginning, check for any damaged or loose suspension connections. Loose connections here indicate worn or broken parts which
MUST BE REPLACED. Failure to replace a damaged or worn spindle and/or link may cause the wheel to separate from the vehicle, possibly resulting in
serious personal injury.

NOTE: These parts are intended for use in vehicles with abnormal alignment and are designed to replace the non-adjustable factory equipment. These
parts are not designed for installation on vehicles with suspension and/or steering systems modified for racing, competition or any other non-standard
purpose.

Before starting alignment, complete inspection checklist and determine the amount of change needed.

Match left and right hand threaded parts and assemble the SmartArms

. Thread the Jam Nuts all the way down on the End Links [left hand Jam

Nut (silver) on the left hand threaded End Link (first thread missing), right hand Jam Nut (black) on the right hand threaded End Link (complete
threads)]. Thread each End Link all the way into the Adjusting Tube (put the left hand Link into the end of the Adjusting Tube which has the radial
groove next to the wrench flats).

Raise the rear of vehicle and support body safely on jack stands. Remove rear tire and wheel assembly.

Remove the bolt from the lower center link at the body mounting bracket. Remove the nut and bolt from the other end of the lower center link.
Note that the center link bushing at the body mounting is slightly wider than the other bushings.

Using the new SmartArm

unit with the wider bushing, install the wider bushing into the body mounting bracket for the lower center link. Re-install

the mounting bolt but do not tighten yet. Position the other end of the new SmartArm

on the spindle and re-install the bolt and nut (do not tighten

nut yet).

Remove the nut and cam bolt from the body mount of the lower rear link and the nut and washer from the other end of the lower rear link at the
spindle.

Position the remaining new SmartArm

unit onto the spindle mounting stud and re-install the washer (with the bevel facing away from the bushing)

and the nut. Do not tighten the nut yet. Position the other end of the new SmartArm

in the body mounting bracket and re-install the cam bolt,

washer and nut with the cam adjustment in the neutral position (do not tighten nut yet).

Safely raise the spindle close to its normal ride position in the wheel well to properly set the rubber bushings (do not raise the body off the jack
stands for safety).

Tighten the cam bolt and nut and torque to 40 ft-lbs (54 N-m). Tighten the three remaining connections to 43 ft-lbs (59 N-m).

Replace the tire and wheel assembly.

10. Adjust camber by loosening jam nuts and turning the Adjusting Tube of the center lower link close to the desired specifications. DO NOT extend

the threads beyond their limits (ensure that the dimple marks on the End Link threads are still located within the Center Tube).

11. Adjust rear toe by loosening jam nuts and turning the Adjusting Tube of the lower rear link to the desired specifications. Note this will affect the

camber reading previously set.

12. Re-adjust the center SmartArm

to affect camber and the aft SmartArm

to affect rear toe until both are within specifications.

13.

Tighten the jam nuts against the Adjustment Tubes on both SmartArms

to 80 ft. lbs. [108 N.M.] and road test vehicle.

ALWAYS CHECK FOR SUSPENSION CLEARANCE

Modifying any suspension component may change other part
clearances and cause binding or interferences. After installing any
Ingalls’ product, the suspension must be checked for binds or
interference between all components, other arms and the chassis.
Be sure that all control arms, struts and steering ends move freely
through the full movement of the suspension (springs may need to
be removed to fully check component travel). Installing any
Ingalls’ product on a modified vehicle (lowered or raised) from the
original factory design requires a detailed check of all suspension
components and their movements. Ingalls recommends that a
trained technician install all products.

Limited Warranty

Subject to Disclaimer. All Ingalls products are warranted against
defects in materials and workmanship for ninety (90) days from
date of purchase. During the warranty period, Ingalls will repair, or
at its option replace at no charge, components that prove to be
defective. The product must be returned, shipping prepaid, to
Ingalls facility. This limited warranty does not apply if the product
is damaged by accident or misuse. The foregoing warranty is in
lieu of all other warranties expressed or implied including but not
limited to any implied warranty of merchantability, fitness, or
adequacy for any particular purpose or use. Ingalls shall not be
liable for any special, incidental or consequential damages
whether in contract, tort, or otherwise resulting from the use or the
inability to use the product.

Warranty Disclaimer

Use of this product in competition, or use on vehicles altered from original manufacturer’s specifications or settings, EXPRESSLY VOIDS WARRANTY.
The user is urged to inspect for suspension binding or interference when the product is used in these manners. However, due to the varying conditions
and manner of use which the product will be subjected to in such uses, Ingalls Engineering Co., Inc. makes no warranties, either express or implied,
including any warranty of merchantability or fitness for a particular purpose for use in competition or with specifications or settings other than those
specified by the original manufacturer’s specifications.

2002 Ingalls Engineering Co., Inc.

Silver Jam Nut

Thread Limit

Dimples

Black Jam Nut

LH Indicator Groove

First Thread
Missing