Pages 49–55 (7 pages)

Positraction Rear Axle

From the 1956–1960 Chevrolet Corvette Chassis Service Operations: Engines and RPO Equipment

How the Positraction differential works and how to service it. It covers the 3.70, 4.11 and 4.56 ratios and the two types used: 1957 to early 1960 units, later converted with a Belleville plate, and later 1960 units. Complaint diagnosis explains poor drive with one wheel slipping, chatter caused by the wrong lubricant, and a backlash check. The section then gives removal, the pinion mate shaft V-notch clearance check, disassembly, four-stack and five-stack clutch plate assembly, installation, and an optional clutch stack arrangement for maximum traction.

Read this section free, starting at page 49

What this section covers

  • Operation and the two Corvette unit types
  • Complaint diagnosis and backlash check
  • Pinion mate shaft clearance
  • Disassembly and inspection
  • Four-stack and five-stack clutch plate assembly
  • Optional maximum-traction clutch stack
Year
1956, 1957, 1958, 1959, 1960
Make
Chevrolet
Vehicle
Components and Systems, Corvette, Fuel Injection, Passenger Cars
Type
Service Manual
Models
Corvette V-8: single and dual four-barrel, Fuel Injection (7014800, 7014900, 7017200, 7017300, 7017310)
Pages
109

What’s inside

Front matter

  1. Foreword and Title PageThe foreword explains why the booklet was written, how its two sections are organized and which passenger car shop manuals to use alongside it. It says the booklet covers Corvettes from 1956 on. The title page names it 1956–1960 Corvette Chassis Service Operations.pp. 1–2

Tuning the Corvette engine

  1. Tune-Up: Mechanical Checks and Adjustmentspp. 3–18
  2. Tune-Up: Instrument Check-Outpp. 19–26
  3. Additional Checks and AdjustmentsTests to use when the tune-up turns up a problem or the owner has a specific complaint. The cylinder balance test grounds pairs of cylinders by firing order and compares rpm and vacuum. The fuel pump test checks volume and pressure. The cooling system pressure test looks for internal and external leaks.pp. 27–29

Regular Production Options

  1. Heavy-Duty Brakes and Suspensionpp. 30–33
  2. Close-Ratio Transmission and Engine ConstructionThe close-ratio three-speed transmission, which starts at the foot of the previous page, with its 2.2, 1.31 and 1-to-1 ratios and clutch gear removal sequence. It is followed by how each Corvette engine differs from the passenger car V-8: chrome-plated rings, five-quart oil pan, notched or domed pistons, and the special-cam engines' bearings and balancing. Valve clearance settings continue at the top of the next page.pp. 34–34
  3. Corvette 4-Speed Transmissionpp. 35–48
  4. Positraction Rear Axlepp. 49–55
  5. Fuel Injection: Fundamentals of Operationpp. 56–72
  6. 7014800 Fuel Injection Service Procedurespp. 73–95
  7. 7014900, 7017300, 7017200 and 7017310 Fuel Injectionpp. 96–103
  8. Fuel Flow Calibrationpp. 104–109