Steering - New Type Rack Assembly
88chevy09Number: 88-198-3B
Section: 3B
Date: APRIL, 1988
Subject: NEW CAST IRON TOP HAT (CITH)
RACK AND PINION POWER STEERING
Model and Year: 1988 CAVALIER WITH POWER STEERING
TO: ALL CHEVROLET DEALERS
Beginning with the following VIN breakpoints, 1988 Cavalier model vehicles equipped with power steering are utilizing a new type of center take-off power rack and pinion steering gear assembly.
The new gear assembly utilizes a cast iron "top hat" in the upper portion of the valve housing assembly. It can be easily identified by visual observation of the housing assembly, or by checking for correct bi-letter codes stamped on the tie rod lock plate (refer to Figure).
Breakpoint Information
Janesville Assembly Plant (VIN Code J)
BI-LETTER
RATIO CODE VIN
16:1 CP JJ184475
14:1 MU
14:1 MW JJ184451
Lordstown Assembly Plant (VIN Code 7)
16:1 CP J7158411
14:1 MW J7158403
Service Part Number Information
When replacing a steering gear assembly, be sure to properly identify the type of rack assembly (Cast Iron Top Hat valve housing or Aluminum valve housing) in the vehicle. The
GMSPO Parts catalog will indicate the correct part number(s) to order based on the model, model year, and type of valve housing (Cast Iron or Aluminum) the vehicle steering gear is equipped with.
The usage of Cast Iron Top Hat steering gear assemblies in celebrity vehicles will be provided as information becomes available.