# NHTSA Engineering Analysis EA88007
> **LOWER CONTROL ARM** · Opened 1987-11-06 · Closed 1988-10-24
## Investigation
- **Action number:** EA88007
- **Type:** Engineering Analysis
- **Open date:** 1987-11-06
- **Close date:** 1988-10-24
- **Manufacturer:** General Motors, LLC
- **Affected makes:** CHEVROLET; GMC
- **Affected components:** SUSPENSION
- **Affected model years:** 1984, 1985, 1986, 1987
- **Affected (make, year) variants:** 56
## Summary

SUMMARY OF INFORMATION FROM MANUFACTURER:MANUFACTURER IS IN RECEIPT OFONE COMPLAINT AND FIVE FIELD REPORTS.PRODUCT REPORT ANALYSIS STATES THELOWER CONTROL ARM FROM WAGGONER CORPORATION APPEARS TO HAVE A SMALL RADIUSAT THE TRANSITION OF THE SIDE WALL TO THE BALL STUD NOSE.CURRENT STAMPINGSOURCE, S.K.D., ALSO HAS A SMALL RADIUS IN THE SAME AREA.S.K.D. HASCHANGED THE TRIM TO INCREASE THE RADIUS TO 1 INCH AND PROVIDE ADDITIONALSTRENGTH IN THE BALL STUD AREA.ANALYSIS:FAILURE DATA INDICATES THE LEFT CONTROL ARM AND DIESEL ENGINEAPPLICATION ARE OVER REPRESENTED.ALL KNOWN FAILURES HAVE OCCURRED AT LOWSPEEDS, OR HAVE BEEN LOCATED AS A RESULT OF AN INCREASE IN THE FREQUENCY OFMAINTENANCE INSPECTIONS.BALL JOINT SEPARATION COULD RESULT IN COLLAPSE OFFRONT WHEEL SUSPENSION AND LOSS OF VEHICLE CONTROL.ACTION: IR TO GM SENT 11/19/87 CONTACT FLEET OWNERS.===

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA88007)
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