What NHTSA investigated
Summary of information from manufacturer:both chrysler and mitsubishiindependently concluded that the failures were due to severe impact loadingtransmitted to the shaft by the steering linkage system -- in other wordsshaft failure is the result, not the cause, of the alleged collisioncircumstances.mitsubishi did strengthen the shaft during the 1984 modelyear by increasing the spline and bearing journal diameters.analysis:failing component is the steering box cross shaft (output shaft)which breaks between the bottom bearing in the steering box and the pitmanarm.known failures involve 4 wheel drive units equipped with powersteering.cross shaft and pitman arm sales are considerably higher on 4WHEEL drive units than 2 wheel drive units.chrysler reports the crossshaft diameter was increased in april, 1984, for increased shaft strengthto improve its capability to withstand severe impact loads.proposed action:upgrade this pe to an ea.contact mitsubishi forinformation on comparable vehicles.===
Vehicles covered
| Make | Model | Model years |
|---|---|---|
| Dodge | RAM 50 | 1979–1987 |
| Plymouth | ARROW | 1979–1987 |
Source
From NHTSA’s investigation file, rebuilt daily. To report a problem with your own vehicle, go to nhtsa.gov/report-a-safety-problem. All open investigations.